github.com/gagliardetto/golang-go@v0.0.0-20201020153340-53909ea70814/not-internal/bytealg/compare_mips64x.s (about) 1 // Copyright 2019 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build mips64 mips64le 6 7 #include "go_asm.h" 8 #include "textflag.h" 9 10 TEXT ·Compare(SB),NOSPLIT,$0-56 11 MOVV a_base+0(FP), R3 12 MOVV b_base+24(FP), R4 13 MOVV a_len+8(FP), R1 14 MOVV b_len+32(FP), R2 15 MOVV $ret+48(FP), R9 16 JMP cmpbody<>(SB) 17 18 TEXT runtime·cmpstring(SB),NOSPLIT,$0-40 19 MOVV a_base+0(FP), R3 20 MOVV b_base+16(FP), R4 21 MOVV a_len+8(FP), R1 22 MOVV b_len+24(FP), R2 23 MOVV $ret+32(FP), R9 24 JMP cmpbody<>(SB) 25 26 // On entry: 27 // R1 length of a 28 // R2 length of b 29 // R3 points to the start of a 30 // R4 points to the start of b 31 // R9 points to the return value (-1/0/1) 32 TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0 33 BEQ R3, R4, samebytes // same start of a and b 34 35 SGTU R1, R2, R7 36 BNE R0, R7, r2_lt_r1 37 MOVV R1, R10 38 JMP entry 39 r2_lt_r1: 40 MOVV R2, R10 // R10 is min(R1, R2) 41 entry: 42 ADDV R3, R10, R8 // R3 start of a, R8 end of a 43 BEQ R3, R8, samebytes // length is 0 44 45 SRLV $4, R10 // R10 is number of chunks 46 BEQ R0, R10, byte_loop 47 48 // make sure both a and b are aligned. 49 OR R3, R4, R11 50 AND $7, R11 51 BNE R0, R11, byte_loop 52 53 chunk16_loop: 54 BEQ R0, R10, byte_loop 55 MOVV (R3), R6 56 MOVV (R4), R7 57 BNE R6, R7, byte_loop 58 MOVV 8(R3), R13 59 MOVV 8(R4), R14 60 ADDV $16, R3 61 ADDV $16, R4 62 SUBVU $1, R10 63 BEQ R13, R14, chunk16_loop 64 SUBV $8, R3 65 SUBV $8, R4 66 67 byte_loop: 68 BEQ R3, R8, samebytes 69 MOVBU (R3), R6 70 ADDVU $1, R3 71 MOVBU (R4), R7 72 ADDVU $1, R4 73 BEQ R6, R7, byte_loop 74 75 byte_cmp: 76 SGTU R6, R7, R8 // R8 = 1 if (R6 > R7) 77 BNE R0, R8, ret 78 MOVV $-1, R8 79 JMP ret 80 81 samebytes: 82 SGTU R1, R2, R6 83 SGTU R2, R1, R7 84 SUBV R7, R6, R8 85 86 ret: 87 MOVV R8, (R9) 88 RET