github.com/goccy/go-jit@v0.0.0-20200514131505-ff78d45cf6af/internal/ccall/jit-rules-x86.ins

/*
 * jit-rules-x86.ins - Instruction selector for x86.
 *
 * Copyright (C) 2004  Southern Storm Software, Pty Ltd.
 *
 * This file is part of the libjit library.
 *
 * The libjit library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * The libjit library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the libjit library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

%regclass reg x86_reg
%regclass breg x86_breg
%regclass freg x86_freg
%lregclass lreg x86_lreg

/*
 * Conversion opcodes.
 */

JIT_OP_TRUNC_SBYTE:
	[=reg, breg] -> {
		x86_widen_reg(inst, $1, $2, 1, 0);
	}

JIT_OP_TRUNC_UBYTE:
	[=reg, breg] -> {
		x86_widen_reg(inst, $1, $2, 0, 0);
	}

JIT_OP_TRUNC_SHORT:
	[=reg, reg] -> {
		x86_widen_reg(inst, $1, $2, 1, 1);
	}

JIT_OP_TRUNC_USHORT:
	[=reg, reg] -> {
		x86_widen_reg(inst, $1, $2, 0, 1);
	}

JIT_OP_CHECK_SBYTE: more_space
	[reg] -> {
		unsigned char *patch1;
		unsigned char *patch2;
		x86_alu_reg_imm(inst, X86_CMP, $1, -128);
		patch1 = inst;
		x86_branch8(inst, X86_CC_LE, 0, 1);
		x86_alu_reg_imm(inst, X86_CMP, $1, 127);
		patch2 = inst;
		x86_branch8(inst, X86_CC_LE, 0, 1);
		x86_patch(patch1, inst);
		inst = throw_builtin(inst, func, JIT_RESULT_OVERFLOW);
		x86_patch(patch2, inst);
	}

JIT_OP_CHECK_UBYTE: more_space
	[reg] -> {
		unsigned char *patch1;
		x86_alu_reg_imm(inst, X86_CMP, $1, 256);
		patch1 = inst;
		x86_branch8(inst, X86_CC_LT, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_OVERFLOW);
		x86_patch(patch1, inst);
	}

JIT_OP_CHECK_SHORT: more_space
	[reg] -> {
		unsigned char *patch1;
		unsigned char *patch2;
		x86_alu_reg_imm(inst, X86_CMP, $1, -32768);
		patch1 = inst;
		x86_branch8(inst, X86_CC_LE, 0, 1);
		x86_alu_reg_imm(inst, X86_CMP, $1, 32767);
		patch2 = inst;
		x86_branch8(inst, X86_CC_LE, 0, 1);
		x86_patch(patch1, inst);
		inst = throw_builtin(inst, func, JIT_RESULT_OVERFLOW);
		x86_patch(patch2, inst);
	}

JIT_OP_CHECK_USHORT: more_space
	[reg] -> {
		unsigned char *patch1;
		x86_alu_reg_imm(inst, X86_CMP, $1, 65536);
		patch1 = inst;
		x86_branch8(inst, X86_CC_LT, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_OVERFLOW);
		x86_patch(patch1, inst);
	}

JIT_OP_CHECK_INT, JIT_OP_CHECK_UINT: copy, more_space
	[reg] -> {
		unsigned char *patch1;
		x86_alu_reg_imm(inst, X86_CMP, $1, 0);
		patch1 = inst;
		x86_branch8(inst, X86_CC_GE, 0, 1);
		inst = throw_builtin(inst, func, JIT_RESULT_OVERFLOW);
		x86_patch(patch1, inst);
	}

JIT_OP_LOW_WORD:
	[=reg, imm] -> {
		jit_uint value = ((jit_uint *)($2))[0];
		x86_mov_reg_imm(inst, $1, value);
	}
	[=reg, local] -> {
		x86_mov_reg_membase(inst, $1, X86_EBP, $2, 4);
	}
	[=reg, lreg] -> {
		if($1 != $2)
		{
			x86_mov_reg_reg(inst, $1, $2, 4);
		}
	}

JIT_OP_EXPAND_INT:
	[=lreg, reg] -> {
		if($1 != $2)
		{
			x86_mov_reg_reg(inst, $1, $2, 4);
		}
		x86_mov_reg_reg(inst, %1, $1, 4);
		x86_shift_reg_imm(inst, X86_SAR, %1, 31);
	}

JIT_OP_EXPAND_UINT:
	[=lreg, reg] -> {
		if($1 != $2)
		{
			x86_mov_reg_reg(inst, $1, $2, 4);
		}
		x86_clear_reg(inst, %1);
	}

JIT_OP_FLOAT32_TO_INT, JIT_OP_FLOAT64_TO_INT, JIT_OP_NFLOAT_TO_INT: stack
	[=reg, freg] -> {
		/* allocate space on the stack for 2 shorts and 1 int */
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, 8);
		/* store FPU control word */
		x86_fnstcw_membase(inst, X86_ESP, 0);
		/* set "round toward zero" mode */
		x86_mov_reg_membase(inst, $1, X86_ESP, 0, 2);
		x86_alu_reg16_imm(inst, X86_OR, $1, 0xc00);
		x86_mov_membase_reg(inst, X86_ESP, 2, $1, 2);
		x86_fldcw_membase(inst, X86_ESP, 2);
		/* convert float to int */
		x86_fist_pop_membase(inst, X86_ESP, 4, 0);
		/* restore FPU control word */
		x86_fldcw_membase(inst, X86_ESP, 0);
		/* move result to the destination */
		x86_mov_reg_membase(inst, $1, X86_ESP, 4, 4);
		/* restore the stack */
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, 8);
	}

JIT_OP_FLOAT32_TO_LONG, JIT_OP_FLOAT64_TO_LONG, JIT_OP_NFLOAT_TO_LONG: stack
	[=lreg, freg] -> {
		/* allocate space on the stack for 2 shorts and 1 long */
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, 12);
		/* store FPU control word */
		x86_fnstcw_membase(inst, X86_ESP, 0);
		/* set "round toward zero" mode */
		x86_mov_reg_membase(inst, $1, X86_ESP, 0, 2);
		x86_alu_reg16_imm(inst, X86_OR, $1, 0xc00);
		x86_mov_membase_reg(inst, X86_ESP, 2, $1, 2);
		x86_fldcw_membase(inst, X86_ESP, 2);
		/* convert float to long */
		x86_fist_pop_membase(inst, X86_ESP, 4, 1);
		/* restore FPU control word */
		x86_fldcw_membase(inst, X86_ESP, 0);
		/* move result to the destination */
		x86_mov_reg_membase(inst, $1, X86_ESP, 4, 4);
		x86_mov_reg_membase(inst, %1, X86_ESP, 8, 4);
		/* restore the stack */
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, 12);
	}

JIT_OP_INT_TO_FLOAT32:
	[=freg, local] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(void *));
		x86_fild_membase(inst, X86_EBP, $2, 0);
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(void *));
	}
	[=freg, reg] -> {
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 0);
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_nint));
	}

JIT_OP_INT_TO_FLOAT64, JIT_OP_INT_TO_NFLOAT:
	[=freg, local] -> {
		x86_fild_membase(inst, X86_EBP, $2, 0);
	}
	[=freg, reg] -> {
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_nint));
	}

JIT_OP_UINT_TO_FLOAT32:
	[=freg, reg, scratch reg] -> {
		x86_clear_reg(inst, $3);
		x86_push_reg(inst, $3);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_UINT_TO_FLOAT64, JIT_OP_UINT_TO_NFLOAT:
	[=freg, reg, scratch reg] -> {
		x86_clear_reg(inst, $3);
		x86_push_reg(inst, $3);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_LONG_TO_FLOAT32:
	[=freg, local] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float32));
		x86_fild_membase(inst, X86_EBP, $2, 1);
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_float32));
	}
	[=freg, lreg] -> {
		x86_push_reg(inst, %2);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_LONG_TO_FLOAT64:
	[=freg, local] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float64));
		x86_fild_membase(inst, X86_EBP, $2, 1);
		x86_fst_membase(inst, X86_ESP, 0, 1, 1);
		x86_fld_membase(inst, X86_ESP, 0, 1);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_float64));
	}
	[=freg, lreg] -> {
		x86_push_reg(inst, %2);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_fst_membase(inst, X86_ESP, 0, 1, 1);
		x86_fld_membase(inst, X86_ESP, 0, 1);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_LONG_TO_NFLOAT:
	[=freg, local] -> {
		x86_fild_membase(inst, X86_EBP, $2, 1);
	}
	[=freg, lreg] -> {
		x86_push_reg(inst, %2);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_ULONG_TO_FLOAT32, JIT_OP_ULONG_TO_FLOAT64, JIT_OP_ULONG_TO_NFLOAT: more_space
	[=freg, lreg] -> {
		/* TODO: review wrt relocation for elf pre-compilation */
		static float f2pow64;
		static int inited;
		unsigned char *patch;
		if(!inited)
		{
			f2pow64 = jit_float32_pow(2.0, 64);
			inited = 1;
		}
		x86_push_reg(inst, %2);
		x86_push_reg(inst, $2);
		x86_fild_membase(inst, X86_ESP, 0, 1);
		x86_test_reg_reg(inst, %2, %2);
		patch = inst;
		x86_branch8(inst, X86_CC_NS, 0, 1);
		x86_fp_op_mem(inst, X86_FADD, &f2pow64, 0);
		x86_patch(patch, inst);
		if(insn->opcode == JIT_OP_ULONG_TO_FLOAT32)
		{
			x86_fst_membase(inst, X86_ESP, 0, 0, 1);
			x86_fld_membase(inst, X86_ESP, 0, 0);
		}
		else if(insn->opcode == JIT_OP_ULONG_TO_FLOAT64)
		{
			x86_fst_membase(inst, X86_ESP, 0, 1, 1);
			x86_fld_membase(inst, X86_ESP, 0, 1);
		}
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_long));
	}

JIT_OP_FLOAT64_TO_FLOAT32, JIT_OP_NFLOAT_TO_FLOAT32: stack
	[freg] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(void *));
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		x86_fld_membase(inst, X86_ESP, 0, 0);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(void *));
	}

JIT_OP_NFLOAT_TO_FLOAT64: stack
	[freg] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float64));
		x86_fst_membase(inst, X86_ESP, 0, 1, 1);
		x86_fld_membase(inst, X86_ESP, 0, 1);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, sizeof(jit_float64));
	}

JIT_OP_FLOAT32_TO_NFLOAT, JIT_OP_FLOAT32_TO_FLOAT64, JIT_OP_FLOAT64_TO_NFLOAT: copy, stack
	[freg] -> {
		/* Nothing to do: loading the value onto the FP stack is sufficient */
	}

/*
 * Arithmetic opcodes.
 */

JIT_OP_IADD: commutative
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_ADD, $1, $2);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_ADD, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_ADD, $1, $2);
	}

JIT_OP_ISUB:
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_SUB, $1, $2);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_SUB, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
	}

JIT_OP_IMUL: commutative
	[reg, imm] -> {
		/* Handle special cases of immediate multiplies */
		switch($2)
		{
			case 0:
			{
				x86_clear_reg(inst, $1);
			}
			break;

			case 1: break;

			case -1:
			{
				x86_neg_reg(inst, $1);
			}
			break;

			case 2:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 1);
			}
			break;

			case 3:
			{
				/* lea reg, [reg + reg * 2] */
				x86_lea_memindex(inst, $1, $1, 0, $1, 1);
			}
			break;

			case 4:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 2);
			}
			break;

			case 5:
			{
				/* lea reg, [reg + reg * 4] */
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
			}
			break;

			case 6:
			{
				/* lea reg, [reg + reg * 2]; add reg, reg */
				x86_lea_memindex(inst, $1, $1, 0, $1, 1);
				x86_alu_reg_reg(inst, X86_ADD, $1, $1);
			}
			break;

			case 8:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 3);
			}
			break;

			case 9:
			{
				/* lea reg, [reg + reg * 8] */
				x86_lea_memindex(inst, $1, $1, 0, $1, 3);
			}
			break;

			case 10:
			{
				/* lea reg, [reg + reg * 4]; add reg, reg */
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
				x86_alu_reg_reg(inst, X86_ADD, $1, $1);
			}
			break;

			case 12:
			{
				/* lea reg, [reg + reg * 2]; shl reg, 2 */
				x86_lea_memindex(inst, $1, $1, 0, $1, 1);
				x86_shift_reg_imm(inst, X86_SHL, $1, 2);
			}
			break;

			case 16:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 4);
			}
			break;

			case 25:
			{
				/* lea reg, [reg + reg * 4]; lea reg, [reg + reg * 4] */
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
			}
			break;

			case 32:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 5);
			}
			break;

			case 64:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 6);
			}
			break;

			case 100:
			{
				/* lea reg, [reg + reg * 4]; shl reg, 2;
				   lea reg, [reg + reg * 4] */
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
				x86_shift_reg_imm(inst, X86_SHL, $1, 2);
				x86_lea_memindex(inst, $1, $1, 0, $1, 2);
			}
			break;

			case 128:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 7);
			}
			break;

			case 256:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 8);
			}
			break;

			case 512:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 9);
			}
			break;

			case 1024:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 10);
			}
			break;

			case 2048:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 11);
			}
			break;

			case 4096:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 12);
			}
			break;

			case 8192:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 13);
			}
			break;

			case 16384:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 14);
			}
			break;

			case 32768:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 15);
			}
			break;

			case 65536:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 16);
			}
			break;

			case 0x00020000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 17);
			}
			break;

			case 0x00040000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 18);
			}
			break;

			case 0x00080000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 19);
			}
			break;

			case 0x00100000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 20);
			}
			break;

			case 0x00200000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 21);
			}
			break;

			case 0x00400000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 22);
			}
			break;

			case 0x00800000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 23);
			}
			break;

			case 0x01000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 24);
			}
			break;

			case 0x02000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 25);
			}
			break;

			case 0x04000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 26);
			}
			break;

			case 0x08000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 27);
			}
			break;

			case 0x10000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 28);
			}
			break;

			case 0x20000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 29);
			}
			break;

			case 0x40000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 30);
			}
			break;

			case (jit_nint)0x80000000:
			{
				x86_shift_reg_imm(inst, X86_SHL, $1, 31);
			}
			break;

			default:
			{
				x86_imul_reg_reg_imm(inst, $1, $1, $2);
			}
			break;
		}
	}
	[reg, local] -> {
		x86_imul_reg_membase(inst, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_imul_reg_reg(inst, $1, $2);
	}

JIT_OP_IDIV: more_space
	[any, immzero] -> {
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
	}
	[reg, imm, if("$2 == 1")] -> {
	}
	[reg, imm, if("$2 == -1")] -> {
		/* Dividing by -1 gives an exception if the argument
		   is minint, or simply negates for other values */
		unsigned char *patch;
		x86_alu_reg_imm(inst, X86_CMP, $1, jit_min_int);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_ARITHMETIC);
		x86_patch(patch, inst);
		x86_neg_reg(inst, $1);
	}
	[reg, imm, scratch reg, if("$2 == 2")] -> {
		x86_mov_reg_reg(inst, $3, $1, 4);
		x86_shift_reg_imm(inst, X86_SHR, $3, 0x1f);
		x86_alu_reg_reg(inst, X86_ADD, $1, $3);
		x86_shift_reg_imm(inst, X86_SAR, $1, 1);
	}
	[reg, imm, scratch reg, if("($2 > 0) && (((jit_nuint)$2) & (((jit_nuint)$2) - 1)) == 0")] -> {
		/* x & (x - 1) is equal to zero if x is a power of 2  */
		/* This code is generated by gcc for pentium. */
		/* We use this code because cmov is not available on all i386 cpus */
		jit_nuint shift, temp, value = $2 >> 1;
		for(shift = 0; value; value >>= 1)
		{
		    ++shift;
		}
		temp = 32 - shift;
		x86_mov_reg_reg(inst, $3, $1, 4);
		x86_shift_reg_imm(inst, X86_SAR, $3, 0x1f);
		x86_shift_reg_imm(inst, X86_SHR, $3, temp);
		x86_alu_reg_reg(inst, X86_ADD, $1, $3);
		x86_shift_reg_imm(inst, X86_SAR, $1, shift);
	}
	[reg("eax"), imm, scratch reg, scratch reg("edx")] -> {
		x86_mov_reg_imm(inst, $3, $2);
		x86_cdq(inst);
		x86_div_reg(inst, $3, 1);
	}
	[reg("eax"), reg, scratch reg("edx")] -> {
		unsigned char *patch, *patch2;
#ifndef JIT_USE_SIGNALS
		x86_alu_reg_reg(inst, X86_OR, $2, $2);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
		x86_patch(patch, inst);
#endif
		x86_alu_reg_imm(inst, X86_CMP, $2, -1);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		x86_alu_reg_imm(inst, X86_CMP, $1, jit_min_int);
		patch2 = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_ARITHMETIC);
		x86_patch(patch, inst);
		x86_patch(patch2, inst);
		x86_cdq(inst);
		x86_div_reg(inst, $2, 1);
	}

JIT_OP_IDIV_UN: more_space
	[any, immzero] -> {
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
	}
	[reg, imm, if("$2 == 1")] -> {
	}
	[reg, imm, if("(((jit_nuint)$2) & (((jit_nuint)$2) - 1)) == 0")] -> {
		/* x & (x - 1) is equal to zero if x is a power of 2  */
		jit_nuint shift, value = $2 >> 1;
		for(shift = 0; value; value >>= 1)
		{
		    ++shift;
		}
		x86_shift_reg_imm(inst, X86_SHR, $1, shift);
	}
	[reg("eax"), imm, scratch reg, scratch reg("edx")] -> {
		x86_mov_reg_imm(inst, $3, $2);
		x86_clear_reg(inst, X86_EDX);
		x86_div_reg(inst, $3, 0);
	}
	[reg("eax"), reg, scratch reg("edx")] -> {
#ifndef JIT_USE_SIGNALS
		unsigned char *patch;
		x86_alu_reg_reg(inst, X86_OR, $2, $2);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
		x86_patch(patch, inst);
#endif
		x86_clear_reg(inst, X86_EDX);
		x86_div_reg(inst, $2, 0);
	}

JIT_OP_IREM: more_space
	[any, immzero] -> {
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
	}
	[reg, imm, if("$2 == 1")] -> {
		x86_clear_reg(inst, $1);
	}
	[reg, imm, if("$2 == -1")] -> {
		/* Dividing by -1 gives an exception if the argument
		   is minint, or simply gives a remainder of zero */
		unsigned char *patch;
		x86_alu_reg_imm(inst, X86_CMP, $1, jit_min_int);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_ARITHMETIC);
		x86_patch(patch, inst);
		x86_clear_reg(inst, $1);
	}
	[=reg("edx"), *reg("eax"), imm, scratch reg, scratch reg("edx")] -> {
		x86_mov_reg_imm(inst, $4, $3);
		x86_cdq(inst);
		x86_div_reg(inst, $4, 1);
	}
	[=reg("edx"), *reg("eax"), reg, scratch reg("edx")] -> {
		unsigned char *patch, *patch2;
#ifndef JIT_USE_SIGNALS
		x86_alu_reg_reg(inst, X86_OR, $3, $3);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
		x86_patch(patch, inst);
#endif
		x86_alu_reg_imm(inst, X86_CMP, $3, -1);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		x86_alu_reg_imm(inst, X86_CMP, $2, jit_min_int);
		patch2 = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_ARITHMETIC);
		x86_patch(patch, inst);
		x86_patch(patch2, inst);
		x86_cdq(inst);
		x86_div_reg(inst, $3, 1);
	}

JIT_OP_IREM_UN: more_space
	[any, immzero] -> {
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
	}
	[reg, imm, if("$2 == 1")] -> {
		x86_clear_reg(inst, $1);
	}
	[reg, imm, if("(((jit_nuint)$2) & (((jit_nuint)$2) - 1)) == 0")] -> {
		/* x & (x - 1) is equal to zero if x is a power of 2  */
		x86_alu_reg_imm(inst, X86_AND, $1, $2 - 1);
	}
	[=reg("edx"), *reg("eax"), imm, scratch reg, scratch reg("edx")] -> {
		x86_mov_reg_imm(inst, $4, $3);
		x86_clear_reg(inst, X86_EDX);
		x86_div_reg(inst, $4, 0);
	}
	[=reg("edx"), *reg("eax"), reg, scratch reg("edx")] -> {
#ifndef JIT_USE_SIGNALS
		unsigned char *patch;
		x86_alu_reg_reg(inst, X86_OR, $3, $3);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_DIVISION_BY_ZERO);
		x86_patch(patch, inst);
#endif
		x86_clear_reg(inst, X86_EDX);
		x86_div_reg(inst, $3, 0);
	}

JIT_OP_INEG:
	[reg] -> {
		x86_neg_reg(inst, $1);
	}

JIT_OP_LADD: commutative
	[lreg, imm] -> {
		jit_int value1 = ((jit_int *)($2))[0];
		jit_int value2 = ((jit_int *)($2))[1];
		if(value1 != 0)
		{
			x86_alu_reg_imm(inst, X86_ADD, $1, value1);
			x86_alu_reg_imm(inst, X86_ADC, %1, value2);
		}
		else
		{
			x86_alu_reg_imm(inst, X86_ADD, %1, value2);
		}
	}
	[lreg, local] -> {
		x86_alu_reg_membase(inst, X86_ADD, $1, X86_EBP, $2);
		x86_alu_reg_membase(inst, X86_ADC, %1, X86_EBP, $2 + 4);
	}
	[lreg, lreg] -> {
		x86_alu_reg_reg(inst, X86_ADD, $1, $2);
		x86_alu_reg_reg(inst, X86_ADC, %1, %2);
	}

JIT_OP_LSUB:
	[lreg, imm] -> {
		jit_int value1 = ((jit_int *)($2))[0];
		jit_int value2 = ((jit_int *)($2))[1];
		if(value1 != 0)
		{
			x86_alu_reg_imm(inst, X86_SUB, $1, value1);
			x86_alu_reg_imm(inst, X86_SBB, %1, value2);
		}
		else
		{
			x86_alu_reg_imm(inst, X86_SUB, %1, value2);
		}
	}
	[lreg, local] -> {
		x86_alu_reg_membase(inst, X86_SUB, $1, X86_EBP, $2);
		x86_alu_reg_membase(inst, X86_SBB, %1, X86_EBP, $2 + 4);
	}
	[lreg, lreg] -> {
		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
		x86_alu_reg_reg(inst, X86_SBB, %1, %2);
	}

JIT_OP_LNEG:
	[lreg] -> {
		/* TODO: gcc generates the first variant while
		   AoA suggests the second. Figure out if one
		   is better than other. */
#if 1
		x86_neg_reg(inst, $1);
		x86_alu_reg_imm(inst, X86_ADC, %1, 0);
		x86_neg_reg(inst, %1);
#else
		x86_neg_reg(inst, %1);
		x86_neg_reg(inst, $1);
		x86_alu_reg_imm(inst, X86_SBB, %1, 0);
#endif
	}

JIT_OP_FADD, JIT_OP_DADD, JIT_OP_NFADD: stack, x87_arith, commutative
	[freg, freg] -> {
		int flags;

		flags = _jit_regs_select(&regs);

		if((flags & _JIT_REGS_NO_POP) == 0)
		{
			x86_fp_op_reg(inst, X86_FADD,
				fp_stack_index(gen, $1 + JIT_REG_STACK_START), 1);
		}
		else if((flags & _JIT_REGS_FLIP_ARGS) != 0)
		{
			x86_fp_op_reg(inst, X86_FADD,
				fp_stack_index(gen, $1 + JIT_REG_STACK_START), 0);
		}
		else
		{
			x86_fp_op(inst, X86_FADD,
				fp_stack_index(gen, $2 + JIT_REG_STACK_START));
		}
	}

JIT_OP_FSUB, JIT_OP_DSUB, JIT_OP_NFSUB: stack, x87_arith_reversible
	[freg, freg] -> {
		int flags;

		flags = _jit_regs_select(&regs);

		if((flags & _JIT_REGS_NO_POP) == 0)
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op_reg(inst, X86_FSUB,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START), 1);
			}
			else
			{
				x86_fp_op_reg(inst, X86_FSUBR,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START), 1);
			}
		}
		else if((flags & _JIT_REGS_FLIP_ARGS) != 0)
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op_reg(inst, X86_FSUB,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START), 0);
			}
			else
			{
				x86_fp_op(inst, X86_FSUBR,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START));
			}
		}
		else
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op(inst, X86_FSUB,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START));
			}
			else
			{
				x86_fp_op_reg(inst, X86_FSUBR,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START), 0);
			}
		}
	}

JIT_OP_FMUL, JIT_OP_DMUL, JIT_OP_NFMUL: stack, x87_arith, commutative
	[freg, freg] -> {
		int flags;

		flags = _jit_regs_select(&regs);

		if((flags & _JIT_REGS_NO_POP) == 0)
		{
			x86_fp_op_reg(inst, X86_FMUL, fp_stack_index(gen, $1 + JIT_REG_STACK_START), 1);
		}
		else if((flags & _JIT_REGS_FLIP_ARGS) != 0)
		{
			x86_fp_op_reg(inst, X86_FMUL, fp_stack_index(gen, $1 + JIT_REG_STACK_START), 0);
		}
		else
		{
			x86_fp_op(inst, X86_FMUL, fp_stack_index(gen, $2 + JIT_REG_STACK_START));
		}
	}

JIT_OP_FDIV, JIT_OP_DDIV, JIT_OP_NFDIV: stack, x87_arith_reversible
	[freg, freg] -> {
		int flags;

		flags = _jit_regs_select(&regs);

		if((flags & _JIT_REGS_NO_POP) == 0)
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op_reg(inst, X86_FDIV,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START), 1);
			}
			else
			{
				x86_fp_op_reg(inst, X86_FDIVR,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START), 1);
			}
		}
		else if((flags & _JIT_REGS_FLIP_ARGS) != 0)
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op_reg(inst, X86_FDIV,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START), 0);
			}
			else
			{
				x86_fp_op(inst, X86_FDIVR,
					fp_stack_index(gen, $1 + JIT_REG_STACK_START));
			}
		}
		else
		{
			if((flags & _JIT_REGS_REVERSE) == 0)
			{
				x86_fp_op(inst, X86_FDIV,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START));
			}
			else
			{
				x86_fp_op_reg(inst, X86_FDIVR,
					fp_stack_index(gen, $2 + JIT_REG_STACK_START), 0);
			}
		}
	}

JIT_OP_FREM, JIT_OP_DREM, JIT_OP_NFREM: stack
	[freg, freg, scratch reg("eax")] -> {
		unsigned char *label;
		label = inst;
		x86_fprem(inst);
		x86_fnstsw(inst);
		x86_alu_reg_imm(inst, X86_AND, X86_EAX, 0x0400);
		x86_branch(inst, X86_CC_NZ, label, 0);
		x86_fstp(inst, 1);
	}

JIT_OP_FNEG, JIT_OP_DNEG, JIT_OP_NFNEG: stack
	[freg] -> {
		x86_fchs(inst);
	}

/*
 * Bitwise opcodes.
 */

JIT_OP_IAND: commutative
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_AND, $1, $2);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_AND, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_AND, $1, $2);
	}

JIT_OP_IOR: commutative
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_OR, $1, $2);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_OR, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $2);
	}

JIT_OP_IXOR: commutative
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_XOR, $1, $2);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_XOR, $1, X86_EBP, $2);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
	}

JIT_OP_INOT:
	[reg] -> {
		x86_not_reg(inst, $1);
	}

JIT_OP_ISHL:
	[reg, imm] -> {
		x86_shift_reg_imm(inst, X86_SHL, $1, ($2 & 0x1F));
	}
	[reg, reg("ecx")] -> {
		x86_shift_reg(inst, X86_SHL, $1);
	}

JIT_OP_ISHR:
	[reg, imm] -> {
		x86_shift_reg_imm(inst, X86_SAR, $1, ($2 & 0x1F));
	}
	[reg, reg("ecx")] -> {
		x86_shift_reg(inst, X86_SAR, $1);
	}

JIT_OP_ISHR_UN:
	[reg, imm] -> {
		x86_shift_reg_imm(inst, X86_SHR, $1, ($2 & 0x1F));
	}
	[reg, reg("ecx")] -> {
		x86_shift_reg(inst, X86_SHR, $1);
	}

JIT_OP_LAND: commutative
	[lreg, imm] -> {
		jit_int value1 = ((jit_int *)($2))[0];
		jit_int value2 = ((jit_int *)($2))[1];
		x86_alu_reg_imm(inst, X86_AND, $1, value1);
		x86_alu_reg_imm(inst, X86_AND, %1, value2);
	}
	[lreg, local] -> {
		x86_alu_reg_membase(inst, X86_AND, $1, X86_EBP, $2);
		x86_alu_reg_membase(inst, X86_AND, %1, X86_EBP, $2 + 4);
	}
	[lreg, lreg] -> {
		x86_alu_reg_reg(inst, X86_AND, $1, $2);
		x86_alu_reg_reg(inst, X86_AND, %1, %2);
	}

JIT_OP_LOR: commutative
	[lreg, imm] -> {
		jit_int value1 = ((jit_int *)($2))[0];
		jit_int value2 = ((jit_int *)($2))[1];
		x86_alu_reg_imm(inst, X86_OR, $1, value1);
		x86_alu_reg_imm(inst, X86_OR, %1, value2);
	}
	[lreg, local] -> {
		x86_alu_reg_membase(inst, X86_OR, $1, X86_EBP, $2);
		x86_alu_reg_membase(inst, X86_OR, %1, X86_EBP, $2 + 4);
	}
	[lreg, lreg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $2);
		x86_alu_reg_reg(inst, X86_OR, %1, %2);
	}

JIT_OP_LXOR: commutative
	[lreg, imm] -> {
		jit_int value1 = ((jit_int *)($2))[0];
		jit_int value2 = ((jit_int *)($2))[1];
		x86_alu_reg_imm(inst, X86_XOR, $1, value1);
		x86_alu_reg_imm(inst, X86_XOR, %1, value2);
	}
	[lreg, local] -> {
		x86_alu_reg_membase(inst, X86_XOR, $1, X86_EBP, $2);
		x86_alu_reg_membase(inst, X86_XOR, %1, X86_EBP, $2 + 4);
	}
	[lreg, lreg] -> {
		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
		x86_alu_reg_reg(inst, X86_XOR, %1, %2);
	}

JIT_OP_LNOT:
	[lreg] -> {
		x86_not_reg(inst, $1);
		x86_not_reg(inst, %1);
	}

/*
 * Branch opcodes.
 */

JIT_OP_BR: branch
	[] -> {
		inst = output_branch(func, inst, 0xEB /* jmp */, insn);
	}

JIT_OP_BR_IFALSE: branch
	[reg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $1);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}

JIT_OP_BR_ITRUE: branch
	[reg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $1);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}

JIT_OP_BR_IEQ: branch
	[reg, immzero] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $1);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}

JIT_OP_BR_INE: branch
	[reg, immzero] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, $1);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}

JIT_OP_BR_ILT: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7C /* lt */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x7C /* lt */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7C /* lt */, insn);
	}

JIT_OP_BR_ILT_UN: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x72 /* lt_un */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x72 /* lt_un */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x72 /* lt_un */, insn);
	}

JIT_OP_BR_ILE: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7E /* le */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x7E /* le */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7E /* le */, insn);
	}

JIT_OP_BR_ILE_UN: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x76 /* le_un */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x76 /* le_un */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x76 /* le_un */, insn);
	}

JIT_OP_BR_IGT: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7F /* gt */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x7F /* gt */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7F /* gt */, insn);
	}

JIT_OP_BR_IGT_UN: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x77 /* gt_un */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x77 /* gt_un */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x77 /* gt_un */, insn);
	}

JIT_OP_BR_IGE: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7D /* ge */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x7D /* ge */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x7D /* ge */, insn);
	}

JIT_OP_BR_IGE_UN: branch
	[reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x73 /* ge_un */, insn);
	}
	[reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $1, X86_EBP, $2);
		inst = output_branch(func, inst, 0x73 /* ge_un */, insn);
	}
	[reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $1, $2);
		inst = output_branch(func, inst, 0x73 /* ge_un */, insn);
	}

JIT_OP_BR_LFALSE: branch
	[lreg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, %1);
		inst = output_branch(func, inst, 0x74 /* eq */, insn);
	}

JIT_OP_BR_LTRUE: branch
	[lreg] -> {
		x86_alu_reg_reg(inst, X86_OR, $1, %1);
		inst = output_branch(func, inst, 0x75 /* ne */, insn);
	}

/*
 * Comparison opcodes.
 */

JIT_OP_IEQ:
	[=reg, reg, immzero] -> {
		x86_alu_reg_reg(inst, X86_OR, $2, $2);
		inst = setcc_reg(inst, $1, X86_CC_EQ, 0);
	}
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_EQ, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_EQ, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_EQ, 0);
	}

JIT_OP_INE:
	[=reg, reg, immzero] -> {
		x86_alu_reg_reg(inst, X86_OR, $2, $2);
		inst = setcc_reg(inst, $1, X86_CC_NE, 0);
	}
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_NE, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_NE, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_NE, 0);
	}

JIT_OP_ILT:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 1);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 1);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 1);
	}

JIT_OP_ILT_UN:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LT, 0);
	}

JIT_OP_ILE:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 1);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 1);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 1);
	}

JIT_OP_ILE_UN:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_LE, 0);
	}

JIT_OP_IGT:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 1);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 1);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 1);
	}

JIT_OP_IGT_UN:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GT, 0);
	}

JIT_OP_IGE:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 1);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 1);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 1);
	}

JIT_OP_IGE_UN:
	[=reg, reg, imm] -> {
		x86_alu_reg_imm(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 0);
	}
	[=reg, reg, local] -> {
		x86_alu_reg_membase(inst, X86_CMP, $2, X86_EBP, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 0);
	}
	[=reg, reg, reg] -> {
		x86_alu_reg_reg(inst, X86_CMP, $2, $3);
		inst = setcc_reg(inst, $1, X86_CC_GE, 0);
	}

/*
 * Mathematical opcodes.
 */

JIT_OP_FATAN, JIT_OP_DATAN, JIT_OP_NFATAN: stack
	[freg, scratch freg] -> {
		x86_fld1(inst);
		x86_fpatan(inst);
		x86_fldz(inst);
		x86_fp_op_reg(inst, X86_FADD, 1, 1);
	}

JIT_OP_FCOS, JIT_OP_DCOS, JIT_OP_NFCOS: stack
	[freg, scratch freg] -> {
		x86_fcos(inst);
		x86_fldz(inst);
		x86_fp_op_reg(inst, X86_FADD, 1, 1);
	}

JIT_OP_FSIN, JIT_OP_DSIN, JIT_OP_NFSIN: stack
	[freg, scratch freg] -> {
		x86_fsin(inst);
		x86_fldz(inst);
		x86_fp_op_reg(inst, X86_FADD, 1, 1);
	}

JIT_OP_FSQRT, JIT_OP_DSQRT, JIT_OP_NFSQRT: stack
	[freg] -> {
		x86_fsqrt(inst);
	}

/*
 * Absolute, minimum, maximum, and sign.
 */

JIT_OP_IABS:
	[reg("eax"), scratch reg("edx")] -> {
		x86_cdq(inst);
		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
	}

JIT_OP_LABS:
	[lreg, scratch reg] -> {
		x86_mov_reg_reg(inst, $2, %1, 4);
		x86_shift_reg_imm(inst, X86_SAR, $2, 31);
		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
		x86_alu_reg_reg(inst, X86_XOR, %1, $2);
		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
		x86_alu_reg_reg(inst, X86_SBB, %1, $2);
	}

JIT_OP_FABS, JIT_OP_DABS, JIT_OP_NFABS: stack
	[freg] -> {
		x86_fabs(inst);
	}

JIT_OP_IMIN_UN:
	[=+reg, +reg, reg] -> {
		x86_alu_reg_reg(inst, X86_SUB, $2, $3);
		x86_alu_reg_reg(inst, X86_SBB, $1, $1);
		x86_alu_reg_reg(inst, X86_AND, $1, $2);
		x86_alu_reg_reg(inst, X86_ADD, $1, $3);
	}

JIT_OP_ISIGN:
	[=reg, imm] -> {
		if($2 < 0)
		{
			x86_mov_reg_imm(inst, $1, -1);
		}
		else if($2 > 0)
		{
			x86_mov_reg_imm(inst, $1, 1);
		}
		else
		{
			x86_clear_reg(inst, $1);
		}
	}
	[=+reg, +reg] -> {
		x86_clear_reg(inst, $1);
		x86_test_reg_reg(inst, $2, $2);
		x86_set_reg(inst, X86_CC_NZ, $1, 0);
		x86_shift_reg_imm(inst, X86_SAR, $2, 31);
		x86_alu_reg_reg(inst, X86_OR, $1, $2);
	}

JIT_OP_LSIGN:
	[=reg, imm] -> {
		jit_long value = *((jit_long *)($2));
		if(value < 0)
		{
			x86_mov_reg_imm(inst, $1, -1);
		}
		else if(value > 0)
		{
			x86_mov_reg_imm(inst, $1, 1);
		}
		else
		{
			x86_clear_reg(inst, $1);
		}
	}
	[=+reg, +lreg] -> {
		x86_clear_reg(inst, $1);
		x86_alu_reg_reg(inst, X86_OR, $2, %2);
		x86_set_reg(inst, X86_CC_NZ, $1, 0);
		x86_shift_reg_imm(inst, X86_SAR, %2, 31);
		x86_alu_reg_reg(inst, X86_OR, $1, %2);
	}

/*
 * Pointer check opcodes.
 */

JIT_OP_CHECK_NULL: note
	[reg] -> {
#if 0 && defined(JIT_USE_SIGNALS)
		/* if $1 contains NULL this generates SEGV and the signal
		   handler will throw the exception  */
		x86_alu_reg_membase(inst, X86_CMP, $1, $1, 0);
#else
		unsigned char *patch;
		x86_alu_reg_reg(inst, X86_OR, $1, $1);
		patch = inst;
		x86_branch8(inst, X86_CC_NE, 0, 0);
		inst = throw_builtin(inst, func, JIT_RESULT_NULL_REFERENCE);
		x86_patch(patch, inst);
#endif
	}

/*
 * Function calls.
 */

JIT_OP_CALL:
	[] -> {
		jit_function_t func = (jit_function_t)(insn->dest);
		x86_call_code(inst, jit_function_to_closure(func));
	}

JIT_OP_CALL_TAIL:
	[] -> {
		jit_function_t func = (jit_function_t)(insn->dest);
		x86_mov_reg_reg(inst, X86_ESP, X86_EBP, sizeof(void *));
		x86_pop_reg(inst, X86_EBP);
		x86_jump_code(inst, jit_function_to_closure(func));
	}

JIT_OP_CALL_INDIRECT:
	[] -> {
		x86_call_reg(inst, X86_EAX);
	}

JIT_OP_CALL_INDIRECT_TAIL:
	[] -> {
		x86_mov_reg_reg(inst, X86_ESP, X86_EBP, sizeof(void *));
		x86_pop_reg(inst, X86_EBP);
		x86_jump_reg(inst, X86_EAX);
	}

JIT_OP_CALL_VTABLE_PTR:
	[] -> {
		x86_call_reg(inst, X86_EAX);
	}

JIT_OP_CALL_VTABLE_PTR_TAIL:
	[] -> {
		x86_mov_reg_reg(inst, X86_ESP, X86_EBP, sizeof(void *));
		x86_pop_reg(inst, X86_EBP);
		x86_jump_reg(inst, X86_EAX);
	}

JIT_OP_CALL_EXTERNAL:
	[] -> {
		x86_call_code(inst, (void *)(insn->dest));
	}

JIT_OP_CALL_EXTERNAL_TAIL:
	[] -> {
		x86_mov_reg_reg(inst, X86_ESP, X86_EBP, sizeof(void *));
		x86_pop_reg(inst, X86_EBP);
		x86_jump_code(inst, (void *)(insn->dest));
	}

JIT_OP_RETURN:
	[] -> {
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_INT: note
	[reg("eax")] -> {
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_LONG: note
	[lreg("eax":"edx")] -> {
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_FLOAT32: note, stack
	[freg, clobber(freg)] -> {
		/* clobber(freg) frees all registers on the fp stack */
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_FLOAT64: note, stack
	[freg, clobber(freg)] -> {
		/* clobber(freg) frees all registers on the fp stack */
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_NFLOAT: note, stack
	[freg, clobber(freg)] -> {
		/* clobber(freg) frees all registers on the fp stack */
		inst = jump_to_epilog(gen, inst, block);
	}

JIT_OP_RETURN_SMALL_STRUCT: note
	[reg, imm] -> {
		switch($2)
		{
		case 1:
			x86_widen_membase(inst, X86_EAX, $1, 0, 0, 0);
			break;

		case 2:
			x86_widen_membase(inst, X86_EAX, $1, 0, 0, 1);
			break;

		case 3:
			if(X86_EAX == $1)
			{
				x86_widen_membase(inst, X86_EDX, $1, 0, 0, 1);
				x86_widen_membase(inst, X86_EAX, $1, 2, 0, 0);
			}
			else
			{
				x86_widen_membase(inst, X86_EAX, $1, 2, 0, 0);
				x86_widen_membase(inst, X86_EDX, $1, 0, 0, 1);
			}
			x86_shift_reg_imm(inst, X86_SHL, X86_EAX, 16);
			x86_alu_reg_reg(inst, X86_OR, X86_EAX, X86_EDX);
			break;

		case 4:
			x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
			break;

		case 5:
			if(X86_EAX == $1)
			{
				x86_widen_membase(inst, X86_EDX, $1, 4, 0, 0);
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
			}
			else
			{
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
				x86_widen_membase(inst, X86_EDX, $1, 4, 0, 0);
			}
			break;

		case 6:
			if(X86_EAX == $1)
			{
				x86_widen_membase(inst, X86_EDX, $1, 4, 0, 1);
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
			}
			else
			{
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
				x86_widen_membase(inst, X86_EDX, $1, 4, 0, 1);
			}
			break;

		case 7:
			if(X86_EAX == $1)
			{
				x86_widen_membase(inst, X86_ECX, $1, 4, 0, 1);
				x86_widen_membase(inst, X86_EDX, $1, 6, 0, 0);
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
			}
			else if(X86_ECX == $1)
			{
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
				x86_widen_membase(inst, X86_EDX, $1, 6, 0, 0);
				x86_widen_membase(inst, X86_ECX, $1, 4, 0, 1);
			}
			else
			{
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
				x86_widen_membase(inst, X86_ECX, $1, 4, 0, 1);
				x86_widen_membase(inst, X86_EDX, $1, 6, 0, 0);
			}
			x86_shift_reg_imm(inst, X86_SHL, X86_EDX, 16);
			x86_alu_reg_reg(inst, X86_OR, X86_EDX, X86_ECX);
			break;

		case 8:
			if(X86_EAX == $1)
			{
				x86_mov_reg_membase(inst, X86_EDX, $1, 4, 4);
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
			}
			else
			{
				x86_mov_reg_membase(inst, X86_EAX, $1, 0, 4);
				x86_mov_reg_membase(inst, X86_EDX, $1, 4, 4);
			}
			break;
		}

		inst = jump_to_epilog(gen, inst, block);
	}

/*
 * Exception handling.
 */

JIT_OP_THROW: branch
	[reg] -> {
		x86_push_reg(inst, $1);
		if(func->builder->setjmp_value != 0)
		{
			/* We have a "setjmp" block in the current function,
			   so we must record the location of the throw first */
			_jit_gen_fix_value(func->builder->setjmp_value);
			if(func->builder->position_independent)
			{
				x86_call_imm(inst, 0);
				x86_pop_membase(inst, X86_EBP,
						func->builder->setjmp_value->frame_offset
						+ jit_jmp_catch_pc_offset);
			}
			else
			{
				int pc = (int) inst;
				x86_mov_membase_imm(inst, X86_EBP,
						    func->builder->setjmp_value->frame_offset
						    + jit_jmp_catch_pc_offset, pc, 4);
			}
		}
		x86_call_code(inst, (void *)jit_exception_throw);
	}

JIT_OP_RETHROW: manual
	[] -> { /* Not used in native code back ends */ }

JIT_OP_LOAD_PC:
	[=reg] -> {
		if(func->builder->position_independent)
		{
			x86_call_imm(inst, 0);
			x86_pop_reg(inst, $1);
		}
		else
		{
			int pc = (int) inst;
			x86_mov_reg_imm(inst, $1, pc);
		}
	}

JIT_OP_LOAD_EXCEPTION_PC: manual
	[] -> { /* Not used in native code back ends */ }

JIT_OP_ENTER_FINALLY: manual
	[] -> { /* Nothing to do here: return address on the stack */ }

JIT_OP_LEAVE_FINALLY: branch
	[] -> {
		/* The "finally" return address is on the stack */
		x86_ret(inst);
	}

JIT_OP_CALL_FINALLY: branch
	[] -> {
		jit_block_t block;

		block = jit_block_from_label(func, (jit_label_t)(insn->dest));
		if(!block)
		{
			return;
		}

		if(block->address)
		{
			x86_call_code(inst, block->address);
		}
		else
		{
			x86_call_imm(inst, block->fixup_list);
			block->fixup_list = (void *)(inst - 4);
		}
	}

JIT_OP_ENTER_FILTER: manual
	[] -> {
		/* TODO */
		TODO();
	}

JIT_OP_LEAVE_FILTER: manual
	[] -> {
		/* TODO */
		TODO();
	}

JIT_OP_CALL_FILTER: manual
	[] -> {
		/* TODO */
		TODO();
	}

JIT_OP_CALL_FILTER_RETURN: manual
	[] -> {
		/* TODO */
		TODO();
	}

JIT_OP_ADDRESS_OF_LABEL:
	[=reg] -> {
		block = jit_block_from_label(func, (jit_label_t)(insn->value1));
		if(func->builder->position_independent)
		{
			/* TODO */
			TODO();
		}
		else
		{
			if(block->address)
			{
				x86_mov_reg_imm(inst, $1, block->address);
			}
			else
			{
				/* Output a placeholder and record on the block's fixup list */
				x86_mov_reg_imm(inst, $1, (int)(block->fixup_absolute_list));
				block->fixup_absolute_list = (void *)(inst - 4);
			}
		}
	}

/*
 * Data manipulation.
 */

JIT_OP_COPY_LOAD_SBYTE, JIT_OP_COPY_LOAD_UBYTE, JIT_OP_COPY_STORE_BYTE: copy
	[=local, imm] -> {
		x86_mov_membase_imm(inst, X86_EBP, $1, $2, 1);
	}
	[=local, breg] -> {
		x86_mov_membase_reg(inst, X86_EBP, $1, $2, 1);
	}
	[reg] -> {}

JIT_OP_COPY_LOAD_SHORT, JIT_OP_COPY_LOAD_USHORT, JIT_OP_COPY_STORE_SHORT: copy
	[=local, imm] -> {
		x86_mov_membase_imm(inst, X86_EBP, $1, $2, 2);
	}
	[=local, reg] -> {
		x86_mov_membase_reg(inst, X86_EBP, $1, $2, 2);
	}
	[reg] -> {}

JIT_OP_COPY_INT: copy
	[=local, imm] -> {
		x86_mov_membase_imm(inst, X86_EBP, $1, $2, 4);
	}
	[reg] -> {}

JIT_OP_COPY_LONG: copy
	[lreg] -> {}

JIT_OP_COPY_FLOAT32: copy, stack
	[freg] -> {}

JIT_OP_COPY_FLOAT64: copy, stack
	[freg] -> {}

JIT_OP_COPY_NFLOAT: copy, stack
	[freg] -> {}

JIT_OP_COPY_STRUCT:
	[=frame, frame, clobber(reg)] -> {
		inst = memory_copy(gen, inst, X86_EBP, $1, X86_EBP, $2,
				   jit_type_get_size(jit_value_get_type(insn->dest)));
	}

JIT_OP_ADDRESS_OF:
	[=reg, frame] -> {
		x86_lea_membase(inst, $1, X86_EBP, $2);
	}

/*
 * Stack pushes and pops.
 */

JIT_OP_INCOMING_REG, JIT_OP_RETURN_REG: note
        [reg] -> {
		/*
		 * This rule does nothing itself. Also at this point
		 * the value is supposed to be already in the register
		 * so the "reg" pattern does not load it either. But
		 * it allows the allocator to check the liveness flags
		 * and free the register if the value is dead.
		 */
	}

JIT_OP_RETRIEVE_FRAME_POINTER: note
	[=reg] -> {
		x86_mov_reg_reg(inst, $1, X86_EBP, 4);
	}

JIT_OP_PUSH_INT: note
	[imm] -> {
		x86_push_imm(inst, $1);
		gen->stack_changed = 1;
	}
	[local] -> {
		x86_push_membase(inst, X86_EBP, $1);
		gen->stack_changed = 1;
	}
	[reg] -> {
		x86_push_reg(inst, $1);
		gen->stack_changed = 1;
	}

JIT_OP_PUSH_LONG: note
	[imm] -> {
		x86_push_imm(inst, ((jit_int *)($1))[1]);
		x86_push_imm(inst, ((jit_int *)($1))[0]);
		gen->stack_changed = 1;
	}
	[local] -> {
		x86_push_membase(inst, X86_EBP, $1 + 4);
		x86_push_membase(inst, X86_EBP, $1);
		gen->stack_changed = 1;
	}
	[lreg] -> {
		x86_push_reg(inst, %1);
		x86_push_reg(inst, $1);
		gen->stack_changed = 1;
	}

JIT_OP_PUSH_FLOAT32: note, stack
	[imm] -> {
		jit_int *ptr = (jit_int *)($1);
		x86_push_imm(inst, ptr[0]);
		gen->stack_changed = 1;
	}
	[local] -> {
		x86_push_membase(inst, X86_EBP, $1);
		gen->stack_changed = 1;
	}
	[freg] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float32));
		x86_fst_membase(inst, X86_ESP, 0, 0, 1);
		gen->stack_changed = 1;
	}

JIT_OP_PUSH_FLOAT64: note, stack
	[imm] -> {
		jit_int *ptr = (jit_int *)($1);
		x86_push_imm(inst, ptr[1]);
		x86_push_imm(inst, ptr[0]);
		gen->stack_changed = 1;
	}
	[local] -> {
		x86_push_membase(inst, X86_EBP, $1 + 4);
		x86_push_membase(inst, X86_EBP, $1);
		gen->stack_changed = 1;
	}
	[freg] -> {
		x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float64));
		x86_fst_membase(inst, X86_ESP, 0, 1, 1);
		gen->stack_changed = 1;
	}

JIT_OP_PUSH_NFLOAT: note, stack
	[imm] -> {
		jit_int *ptr = (jit_int *)($1);
		if(sizeof(jit_nfloat) != sizeof(jit_float64))
		{
			x86_push_imm(inst, ptr[2]);
		}
		x86_push_imm(inst, ptr[1]);
		x86_push_imm(inst, ptr[0]);
		gen->stack_changed = 1;
	}
	[local] -> {
		if(sizeof(jit_nfloat) != sizeof(jit_float64))
		{
			x86_push_membase(inst, X86_EBP, $1 + 8);
		}
		x86_push_membase(inst, X86_EBP, $1 + 4);
		x86_push_membase(inst, X86_EBP, $1);
		gen->stack_changed = 1;
	}
	[freg] -> {
		if(sizeof(jit_nfloat) != sizeof(jit_float64))
		{
			x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_nfloat));
			x86_fst80_membase(inst, X86_ESP, 0);
		}
		else
		{
			x86_alu_reg_imm(inst, X86_SUB, X86_ESP, sizeof(jit_float64));
			x86_fst_membase(inst, X86_ESP, 0, 1, 1);
		}
		gen->stack_changed = 1;
	}

JIT_OP_PUSH_STRUCT: note, more_space
	[reg, clobber(reg)] -> {
		jit_nuint size;
		size = (jit_nuint)jit_value_get_nint_constant(insn->value2);
		if((size % sizeof(void *)) == 0 && size <= 4 * sizeof(void *))
		{
			/* Handle small structures that are a multiple of the word size */
			while(size > 0)
			{
				size -= sizeof(void *);
				x86_push_membase(inst, $1, size);
			}
		}
		else
		{
			/* Handle arbitrary-sized structures */
			x86_alu_reg_imm(inst, X86_SUB, X86_ESP, ROUND_STACK(size));
			inst = memory_copy(gen, inst, X86_ESP, 0, $1, 0, size);
		}
		gen->stack_changed = 1;
	}

JIT_OP_POP_STACK:
	[] -> {
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, insn->value1->address);
		gen->stack_changed = 1;
	}

JIT_OP_FLUSH_SMALL_STRUCT:
	[] -> {
		jit_nuint size;
		jit_nint offset;
		_jit_gen_fix_value(insn->value1);
		size = jit_type_get_size(jit_value_get_type(insn->value1));
		offset = insn->value1->frame_offset;
		inst = store_small_struct
			(inst, X86_EAX, X86_EDX, X86_EBP, offset, (jit_nint)size, 0);
	}

/*
 * Pointer-relative loads and stores.
 */

JIT_OP_LOAD_RELATIVE_SBYTE:
	[=reg, reg, imm] -> {
		x86_widen_membase(inst, $1, $2, $3, 1, 0);
	}

JIT_OP_LOAD_RELATIVE_UBYTE:
	[=reg, reg, imm] -> {
		x86_widen_membase(inst, $1, $2, $3, 0, 0);
	}

JIT_OP_LOAD_RELATIVE_SHORT:
	[=reg, reg, imm] -> {
		x86_widen_membase(inst, $1, $2, $3, 1, 1);
	}

JIT_OP_LOAD_RELATIVE_USHORT:
	[=reg, reg, imm] -> {
		x86_widen_membase(inst, $1, $2, $3, 0, 1);
	}

JIT_OP_LOAD_RELATIVE_INT:
	[=reg, reg, imm] -> {
		x86_mov_reg_membase(inst, $1, $2, $3, 4);
	}

JIT_OP_LOAD_RELATIVE_LONG:
	[=lreg, reg, imm] -> {
		if($1 == $2)
		{
			x86_mov_reg_membase(inst, %1, $2, $3 + 4, 4);
			x86_mov_reg_membase(inst, $1, $2, $3, 4);
		}
		else
		{
			x86_mov_reg_membase(inst, $1, $2, $3, 4);
			x86_mov_reg_membase(inst, %1, $2, $3 + 4, 4);
		}
	}

JIT_OP_LOAD_RELATIVE_FLOAT32:
	[=freg, reg, imm] -> {
		x86_fld_membase(inst, $2, $3, 0);
	}

JIT_OP_LOAD_RELATIVE_FLOAT64:
	[=freg, reg, imm] -> {
		x86_fld_membase(inst, $2, $3, 1);
	}

JIT_OP_LOAD_RELATIVE_NFLOAT:
	[=freg, reg, imm, if("sizeof(jit_nfloat) != sizeof(jit_float64)")] -> {
		x86_fld80_membase(inst, $2, $3);
	}
	[=freg, reg, imm, if("sizeof(jit_nfloat) == sizeof(jit_float64)")] -> {
		x86_fld_membase(inst, $2, $3, 1);
	}

JIT_OP_LOAD_RELATIVE_STRUCT: more_space
	[=frame, reg, imm, clobber(reg)] -> {
		inst = memory_copy(gen, inst, X86_EBP, $1, $2, $3,
				   jit_type_get_size(jit_value_get_type(insn->dest)));
	}

JIT_OP_STORE_RELATIVE_BYTE: ternary
	[imm, imm, imm] -> {
		x86_mov_mem_imm(inst, $1 + $3, $2, 1);
	}
	[imm, breg, imm] -> {
		x86_mov_mem_reg(inst, $1 + $3, $2, 1);
	}
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, $2, 1);
	}
	[reg, breg, imm] -> {
		x86_mov_membase_reg(inst, $1, $3, $2, 1);
	}

JIT_OP_STORE_RELATIVE_SHORT: ternary
	[imm, imm, imm] -> {
		x86_mov_mem_imm(inst, $1 + $3, $2, 2);
	}
	[imm, reg, imm] -> {
		x86_mov_mem_reg(inst, $1 + $3, $2, 2);
	}
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, $2, 2);
	}
	[reg, reg, imm] -> {
		x86_mov_membase_reg(inst, $1, $3, $2, 2);
	}

JIT_OP_STORE_RELATIVE_INT: ternary
	[imm, imm, imm] -> {
		x86_mov_mem_imm(inst, $1 + $3, $2, 4);
	}
	[imm, reg, imm] -> {
		x86_mov_mem_reg(inst, $1 + $3, $2, 4);
	}
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, $2, 4);
	}
	[reg, reg, imm] -> {
		x86_mov_membase_reg(inst, $1, $3, $2, 4);
	}

JIT_OP_STORE_RELATIVE_LONG: ternary
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, *(int *)($2), 4);
		x86_mov_membase_imm(inst, $1, $3 + 4, *(int *)($2 + 4), 4);
	}
	[reg, local, imm, scratch reg] -> {
		x86_mov_reg_membase(inst, $4, X86_EBP, $2, 4);
		x86_mov_membase_reg(inst, $1, $3, $4, 4);
		x86_mov_reg_membase(inst, $4, X86_EBP, $2 + 4, 4);
		x86_mov_membase_reg(inst, $1, $3 + 4, $4, 4);
	}
	[reg, lreg, imm] -> {
		x86_mov_membase_reg(inst, $1, $3, $2, 4);
		x86_mov_membase_reg(inst, $1, $3 + 4, %2, 4);
	}

JIT_OP_STORE_RELATIVE_FLOAT32: ternary, stack
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, ((int *)($2))[0], 4);
	}
	[reg, freg, imm] -> {
		x86_fst_membase(inst, $1, $3, 0, 1);
	}

JIT_OP_STORE_RELATIVE_FLOAT64: ternary, stack
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, ((int *)($2))[0], 4);
		x86_mov_membase_imm(inst, $1, $3 + 4, ((int *)($2))[1], 4);
	}
	[reg, freg, imm] -> {
		x86_fst_membase(inst, $1, $3, 1, 1);
	}

JIT_OP_STORE_RELATIVE_NFLOAT: ternary, stack
	[reg, imm, imm] -> {
		x86_mov_membase_imm(inst, $1, $3, ((int *)($2))[0], 4);
		x86_mov_membase_imm(inst, $1, $3 + 4, ((int *)($2))[1], 4);
		if(sizeof(jit_nfloat) != sizeof(jit_float64))
		{
			x86_mov_membase_imm(inst, $1, $3 + 8, ((int *)($2))[2], 4);
		}
	}
	[reg, freg, imm] -> {
		if(sizeof(jit_nfloat) != sizeof(jit_float64))
		{
			x86_fst80_membase(inst, $1, $3);
		}
		else
		{
			x86_fst_membase(inst, $1, $3, 1, 1);
		}
	}

JIT_OP_STORE_RELATIVE_STRUCT: manual
	[] -> {
		unsigned char *inst;
		int reg = _jit_regs_load_value
			(gen, insn->dest, 0,
			 (insn->flags & (JIT_INSN_DEST_NEXT_USE |
			 				 JIT_INSN_DEST_LIVE)));
		_jit_regs_spill_all(gen);
		_jit_gen_fix_value(insn->value1);
		inst = gen->ptr;
		_jit_gen_check_space(gen, 128);
		reg = _jit_reg_info[reg].cpu_reg;
		inst = memory_copy(gen, inst, reg, (int)(insn->value2->address),
						   X86_EBP, insn->value1->frame_offset,
						   jit_type_get_size(jit_value_get_type(insn->value1)));
		gen->ptr = inst;
	}

JIT_OP_ADD_RELATIVE:
	[reg, imm] -> {
		if(insn->value2->address != 0)
		{
			x86_alu_reg_imm(inst, X86_ADD, $1, $2);
		}
	}

/*
 * Array element loads and stores.
 */

JIT_OP_LOAD_ELEMENT_SBYTE:
	[=reg, reg, reg] -> {
		x86_widen_memindex(inst, $1, $2, 0, $3, 0, 1, 0);
	}

JIT_OP_LOAD_ELEMENT_UBYTE:
	[=reg, reg, reg] -> {
		x86_widen_memindex(inst, $1, $2, 0, $3, 0, 0, 0);
	}

JIT_OP_LOAD_ELEMENT_SHORT:
	[=reg, reg, reg] -> {
		x86_widen_memindex(inst, $1, $2, 0, $3, 1, 1, 1);
	}

JIT_OP_LOAD_ELEMENT_USHORT:
	[=reg, reg, reg] -> {
		x86_widen_memindex(inst, $1, $2, 0, $3, 1, 0, 1);
	}

JIT_OP_LOAD_ELEMENT_INT:
	[=reg, reg, reg] -> {
		x86_mov_reg_memindex(inst, $1, $2, 0, $3, 2, 4);
	}

JIT_OP_LOAD_ELEMENT_LONG:
	[=lreg, reg, reg] -> {
		if($1 == $2 || $1 == $3)
		{
			x86_mov_reg_memindex(inst, %1, $2, 4, $3, 3, 4);
			x86_mov_reg_memindex(inst, $1, $2, 0, $3, 3, 4);
		}
		else
		{
			x86_mov_reg_memindex(inst, $1, $2, 0, $3, 3, 4);
			x86_mov_reg_memindex(inst, %1, $2, 4, $3, 3, 4);
		}
	}

JIT_OP_LOAD_ELEMENT_FLOAT32:
	[=freg, reg, reg] -> {
		x86_fld_memindex(inst, $2, 0, $3, 2, 0);
	}

JIT_OP_LOAD_ELEMENT_FLOAT64:
	[=freg, reg, reg] -> {
		x86_fld_memindex(inst, $2, 0, $3, 3, 1);
	}

JIT_OP_LOAD_ELEMENT_NFLOAT:
	[=freg, reg, +reg, if("sizeof(jit_nfloat) != sizeof(jit_float64)")] -> {
    		/* lea $3, [$3 + $3 * 2]  */
		x86_lea_memindex(inst, $3, $3, 0, $3, 1);
		/* fld [$2 * 4] */
		x86_fld80_memindex(inst, $2, 0, $3, 2);
	}
	[=freg, reg, reg, if("sizeof(jit_nfloat) == sizeof(jit_float64)")] -> {
		x86_fld_memindex(inst, $2, 0, $3, 3, 1);
	}

JIT_OP_STORE_ELEMENT_BYTE: ternary
	[reg, reg, breg] -> {
		x86_mov_memindex_reg(inst, $1, 0, $2, 0, $3, 1);
	}

JIT_OP_STORE_ELEMENT_SHORT: ternary
	[reg, reg, reg] -> {
		x86_mov_memindex_reg(inst, $1, 0, $2, 1, $3, 2);
	}

JIT_OP_STORE_ELEMENT_INT: ternary
	[reg, reg, reg] -> {
		x86_mov_memindex_reg(inst, $1, 0, $2, 2, $3, 4);
	}

JIT_OP_STORE_ELEMENT_LONG: ternary
	[reg, reg, imm] -> {
		x86_mov_memindex_imm(inst, $1, 0, $2, 3, *(int *)($3), 4);
		x86_mov_memindex_imm(inst, $1, 4, $2, 3, *(int *)($3 + 4), 4);
	}
	[reg, reg, local, scratch reg] -> {
		x86_mov_reg_membase(inst, $4, X86_EBP, $3, 4);
		x86_mov_memindex_reg(inst, $1, 0, $2, 3, $4, 4);
		x86_mov_reg_membase(inst, $4, X86_EBP, $3 + 4, 4);
		x86_mov_memindex_reg(inst, $1, 4, $2, 3, $4, 4);
	}
	[reg, reg, lreg] -> {
		x86_mov_memindex_reg(inst, $1, 0, $2, 3, $3, 4);
		x86_mov_memindex_reg(inst, $1, 4, $2, 3, %3, 4);
	}

JIT_OP_STORE_ELEMENT_FLOAT32: ternary, stack
	[reg, reg, freg] -> {
		x86_fst_memindex(inst, $1, 0, $2, 2, 0, 1);
	}

JIT_OP_STORE_ELEMENT_FLOAT64: ternary, stack
	[reg, reg, freg] -> {
		x86_fst_memindex(inst, $1, 0, $2, 3, 1, 1);
	}

JIT_OP_STORE_ELEMENT_NFLOAT: ternary, stack
	[reg, +reg, freg, if("sizeof(jit_nfloat) != sizeof(jit_float64)")] -> {
    		/* lea reg2, [reg2 + reg2 * 2]  */
		x86_lea_memindex(inst, $2, $2, 0, $2, 1);
		/* fst [reg2 * 4] */
		x86_fst80_memindex(inst, $1, 0, $2, 2);
	}
	[reg, reg, freg, if("sizeof(jit_nfloat) == sizeof(jit_float64)")] -> {
		x86_fst_memindex(inst, $1, 0, $2, 3, 1, 1);
	}

/*
 * Block operations.
 */

JIT_OP_MEMCPY: ternary
	[any, any, imm, if("$3 <= 0")] -> { }
	[reg, reg, imm, scratch breg, if("$3 <= 32"), space("32 + $3 * 4")] -> {
		int disp;
		disp = 0;
		while($3 >= (disp + 4))
		{
			x86_mov_reg_membase(inst, $4, $2, disp, 4);
			x86_mov_membase_reg(inst, $1, disp, $4, 4);
			disp += 4;
		}
		if($3 >= (disp + 2))
		{
			x86_mov_reg_membase(inst, $4, $2, disp, 2);
			x86_mov_membase_reg(inst, $1, disp, $4, 2);
			disp += 2;
		}
		if($3 > disp)
		{
			x86_mov_reg_membase(inst, $4, $2, disp, 1);
			x86_mov_membase_reg(inst, $1, disp, $4, 1);
		}
	}
	[reg, reg, reg, clobber("eax", "ecx", "edx", "ebx")] -> {
		x86_push_reg(inst, $3);
		x86_push_reg(inst, $2);
		x86_push_reg(inst, $1);
		x86_call_code(inst, jit_memcpy);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, 3 * sizeof(void *));
	}

JIT_OP_MEMMOVE: ternary
	[any, any, imm, if("$3 <= 0")] -> { }
	[reg, reg, reg, clobber("eax", "ecx", "edx", "ebx")] -> {
		x86_push_reg(inst, $3);
		x86_push_reg(inst, $2);
		x86_push_reg(inst, $1);
		x86_call_code(inst, jit_memmove);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, 3 * sizeof(void *));
	}

JIT_OP_MEMSET: ternary
	[any, any, imm, if("$3 <= 0")] -> { }
	[reg, imm, imm, if("$3 <= 32"), space("32 + $3 * 4")] -> {
		int disp;
		disp = 0;
		while($3 >= (disp + 4))
		{
			x86_mov_membase_imm(inst, $1, disp, $2 * 0x01010101, 4);
			disp += 4;
		}
		if($3 >= (disp + 2))
		{
			x86_mov_membase_imm(inst, $1, disp, $2 * 0x0101, 2);
			disp += 2;
		}
		if(insn->value2->address > disp)
		{
			x86_mov_membase_imm(inst, $1, disp, $2, 1);
		}
	}
	[reg, breg, imm, if("$3 < 4")] -> {
		x86_mov_membase_reg(inst, $1, 0, $2, 1);
		if($3 > 1)
		{
			x86_mov_membase_reg(inst, $1, 1, $2, 1);
			if($3 > 2)
			{
				x86_mov_membase_reg(inst, $1, 2, $2, 1);
			}
		}
	}
	[reg, +reg, imm, scratch reg,
	 if("$3 <= 32 && ($3 % 2) == 0"), space("32 + $3 * 4")] -> {
		int disp;
		x86_mov_reg_reg(inst, $4, $2, 4);
		x86_shift_reg_imm(inst, X86_SHL, $2, 8);
		x86_alu_reg_reg(inst, X86_OR, $2, $4);
		x86_mov_reg_reg(inst, $4, $2, 4);
		x86_shift_reg_imm(inst, X86_SHL, $2, 16);
		x86_alu_reg_reg(inst, X86_OR, $2, $4);
		disp = 0;
		while($3 >= (disp + 4))
		{
			x86_mov_membase_reg(inst, $1, disp, $2, 4);
			disp += 4;
		}
		if($3 > disp)
		{
			x86_mov_membase_reg(inst, $1, disp, $2, 2);
		}
	}
	[reg, +breg, imm, scratch reg,
	 if("$3 <= 32 && ($3 % 2) != 0"), space("32 + $3 * 4")] -> {
		int disp;
		x86_mov_reg_reg(inst, $4, $2, 4);
		x86_shift_reg_imm(inst, X86_SHL, $2, 8);
		x86_alu_reg_reg(inst, X86_OR, $2, $4);
		x86_mov_reg_reg(inst, $4, $2, 4);
		x86_shift_reg_imm(inst, X86_SHL, $2, 16);
		x86_alu_reg_reg(inst, X86_OR, $2, $4);
		disp = 0;
		while($3 >= (disp + 4))
		{
			x86_mov_membase_reg(inst, $1, disp, $2, 4);
			disp += 4;
		}
		if($3 >= (disp + 2))
		{
			x86_mov_membase_reg(inst, $1, disp, $2, 2);
			disp += 2;
		}
		if($3 > disp)
		{
			x86_mov_membase_reg(inst, $1, disp, $2, 1);
		}
	}
	[reg, reg, reg, clobber("eax", "ecx", "edx", "ebx")] -> {
		x86_push_reg(inst, $3);
		x86_push_reg(inst, $2);
		x86_push_reg(inst, $1);
		x86_call_code(inst, jit_memset);
		x86_alu_reg_imm(inst, X86_ADD, X86_ESP, 3 * sizeof(void *));
	}

/*
 * Allocate memory from the stack.
 */

JIT_OP_ALLOCA:
	[reg] -> {
		x86_alu_reg_reg(inst, X86_SUB, X86_ESP, $1);
		x86_mov_reg_reg(inst, $1, X86_ESP, 4);
		gen->stack_changed = 1;
	}

JIT_OP_JUMP_TABLE: ternary, branch
	[reg, imm, imm, space("32 + sizeof(void *) * $3")] -> {
		unsigned char *patch_jump_table;
		unsigned char *patch_fall_through;
		int index;
		jit_label_t *labels;
		jit_nint num_labels;
		jit_block_t block;

		labels = (jit_label_t *) $2;
		num_labels = $3;

		x86_alu_reg_imm(inst, X86_CMP, $1, num_labels);
		patch_fall_through = inst;
		x86_branch32(inst, X86_CC_AE, 0, 0);

		if(func->builder->position_independent)
		{
			/* TODO */
			TODO();
		}
		else
		{
			patch_jump_table = inst;
			x86_jump_memindex(inst, X86_NOBASEREG, 0, $1, 2);
			while(((jit_nint) inst & (sizeof(void*) - 1)) != 0)
			{
				x86_nop(inst);
			}

			// displacement goes after opcode. ModR/M, and SIB bytes
			*((void **)(patch_jump_table + 3)) = inst;
		}

		for(index = 0; index < num_labels; index++)
		{
			block = jit_block_from_label(func, labels[index]);
			if(!block)
			{
				return;
			}

			if(func->builder->position_independent)
			{
				/* TODO */
				TODO();
			}
			else
			{
				if(block->address)
				{
					x86_imm_emit32(inst, block->address);
				}
				else
				{
					/* Output a placeholder and record on the block's fixup list */
					x86_imm_emit32(inst, (int)(block->fixup_absolute_list));
					block->fixup_absolute_list = (void *)(inst - 4);
				}
			}
		}

		x86_patch(patch_fall_through, inst);
	}