github.com/gopherd/gonum@v0.0.4/internal/asm/c128/dotuunitary_amd64.s (about)

     1  // Copyright ©2016 The Gonum 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 !noasm,!gccgo,!safe
     6  
     7  #include "textflag.h"
     8  
     9  #define MOVDDUP_XPTR_IDX_8__X3    LONG $0x1C120FF2; BYTE $0xC6 // MOVDDUP (SI)(AX*8), X3
    10  #define MOVDDUP_16_XPTR_IDX_8__X5    LONG $0x6C120FF2; WORD $0x10C6 // MOVDDUP 16(SI)(AX*8), X5
    11  #define MOVDDUP_32_XPTR_IDX_8__X7    LONG $0x7C120FF2; WORD $0x20C6 // MOVDDUP 32(SI)(AX*8), X7
    12  #define MOVDDUP_48_XPTR_IDX_8__X9    LONG $0x120F44F2; WORD $0xC64C; BYTE $0x30 // MOVDDUP 48(SI)(AX*8), X9
    13  
    14  #define MOVDDUP_XPTR_IIDX_8__X2    LONG $0x14120FF2; BYTE $0xD6 // MOVDDUP (SI)(DX*8), X2
    15  #define MOVDDUP_16_XPTR_IIDX_8__X4    LONG $0x64120FF2; WORD $0x10D6 // MOVDDUP 16(SI)(DX*8), X4
    16  #define MOVDDUP_32_XPTR_IIDX_8__X6    LONG $0x74120FF2; WORD $0x20D6 // MOVDDUP 32(SI)(DX*8), X6
    17  #define MOVDDUP_48_XPTR_IIDX_8__X8    LONG $0x120F44F2; WORD $0xD644; BYTE $0x30 // MOVDDUP 48(SI)(DX*8), X8
    18  
    19  #define ADDSUBPD_X2_X3    LONG $0xDAD00F66 // ADDSUBPD X2, X3
    20  #define ADDSUBPD_X4_X5    LONG $0xECD00F66 // ADDSUBPD X4, X5
    21  #define ADDSUBPD_X6_X7    LONG $0xFED00F66 // ADDSUBPD X6, X7
    22  #define ADDSUBPD_X8_X9    LONG $0xD00F4566; BYTE $0xC8 // ADDSUBPD X8, X9
    23  
    24  #define X_PTR SI
    25  #define Y_PTR DI
    26  #define LEN CX
    27  #define TAIL BX
    28  #define SUM X0
    29  #define P_SUM X1
    30  #define IDX AX
    31  #define I_IDX DX
    32  
    33  // func DotuUnitary(x, y []complex128) (sum complex128)
    34  TEXT ·DotuUnitary(SB), NOSPLIT, $0
    35  	MOVQ    x_base+0(FP), X_PTR  // X_PTR = &x
    36  	MOVQ    y_base+24(FP), Y_PTR // Y_PTR = &y
    37  	MOVQ    x_len+8(FP), LEN     // LEN = min( len(x), len(y) )
    38  	CMPQ    y_len+32(FP), LEN
    39  	CMOVQLE y_len+32(FP), LEN
    40  	PXOR    SUM, SUM             // SUM = 0
    41  	CMPQ    LEN, $0              // if LEN == 0 { return }
    42  	JE      dot_end
    43  	PXOR    P_SUM, P_SUM         // P_SUM = 0
    44  	XORQ    IDX, IDX             // IDX = 0
    45  	MOVQ    $1, DX               // j = 1
    46  	MOVQ    LEN, TAIL
    47  	ANDQ    $3, TAIL             // TAIL = floor( LEN / 4 )
    48  	SHRQ    $2, LEN              // LEN = LEN % 4
    49  	JZ      dot_tail             // if LEN == 0 { goto dot_tail }
    50  
    51  dot_loop: // do {
    52  	MOVDDUP_XPTR_IDX_8__X3    // X_(i+1) = { real(x[i], real(x[i]) }
    53  	MOVDDUP_16_XPTR_IDX_8__X5
    54  	MOVDDUP_32_XPTR_IDX_8__X7
    55  	MOVDDUP_48_XPTR_IDX_8__X9
    56  
    57  	MOVDDUP_XPTR_IIDX_8__X2    // X_i = { imag(x[i]), imag(x[i]) }
    58  	MOVDDUP_16_XPTR_IIDX_8__X4
    59  	MOVDDUP_32_XPTR_IIDX_8__X6
    60  	MOVDDUP_48_XPTR_IIDX_8__X8
    61  
    62  	// X_j = { imag(y[i]), real(y[i]) }
    63  	MOVUPS (Y_PTR)(IDX*8), X10
    64  	MOVUPS 16(Y_PTR)(IDX*8), X11
    65  	MOVUPS 32(Y_PTR)(IDX*8), X12
    66  	MOVUPS 48(Y_PTR)(IDX*8), X13
    67  
    68  	// X_(i+1) = { imag(a) * real(x[i]), real(a) * real(x[i])  }
    69  	MULPD X10, X3
    70  	MULPD X11, X5
    71  	MULPD X12, X7
    72  	MULPD X13, X9
    73  
    74  	// X_j = { real(y[i]), imag(y[i]) }
    75  	SHUFPD $0x1, X10, X10
    76  	SHUFPD $0x1, X11, X11
    77  	SHUFPD $0x1, X12, X12
    78  	SHUFPD $0x1, X13, X13
    79  
    80  	// X_i     = { real(a) * imag(x[i]), imag(a) * imag(x[i])  }
    81  	MULPD X10, X2
    82  	MULPD X11, X4
    83  	MULPD X12, X6
    84  	MULPD X13, X8
    85  
    86  	// X_(i+1) = {
    87  	//	imag(result[i]):  imag(a)*real(x[i]) + real(a)*imag(x[i]),
    88  	//	real(result[i]):  real(a)*real(x[i]) - imag(a)*imag(x[i])
    89  	//  }
    90  	ADDSUBPD_X2_X3
    91  	ADDSUBPD_X4_X5
    92  	ADDSUBPD_X6_X7
    93  	ADDSUBPD_X8_X9
    94  
    95  	// psum += result[i]
    96  	ADDPD X3, SUM
    97  	ADDPD X5, P_SUM
    98  	ADDPD X7, SUM
    99  	ADDPD X9, P_SUM
   100  
   101  	ADDQ  $8, IDX    // IDX += 8
   102  	ADDQ  $8, I_IDX  // I_IDX += 8
   103  	DECQ  LEN
   104  	JNZ   dot_loop   // } while --LEN > 0
   105  	ADDPD P_SUM, SUM // SUM += P_SUM
   106  	CMPQ  TAIL, $0   // if TAIL == 0 { return }
   107  	JE    dot_end
   108  
   109  dot_tail: // do {
   110  	MOVDDUP_XPTR_IDX_8__X3     // X_(i+1) = { real(x[i]            , real(x[i])            }
   111  	MOVDDUP_XPTR_IIDX_8__X2    // X_i     = { imag(x[i])           , imag(x[i])            }
   112  	MOVUPS (Y_PTR)(IDX*8), X10 // X_j     = {  imag(y[i])          ,  real(y[i])           }
   113  	MULPD  X10, X3             // X_(i+1) = {  imag(a) * real(x[i]),  real(a) * real(x[i]) }
   114  	SHUFPD $0x1, X10, X10      // X_j     = {  real(y[i])          ,  imag(y[i])           }
   115  	MULPD  X10, X2             // X_i     = {  real(a) * imag(x[i]),  imag(a) * imag(x[i]) }
   116  
   117  	// X_(i+1) = {
   118  	//	imag(result[i]):  imag(a)*real(x[i]) + real(a)*imag(x[i]),
   119  	//	real(result[i]):  real(a)*real(x[i]) - imag(a)*imag(x[i])
   120  	//  }
   121  	ADDSUBPD_X2_X3
   122  	ADDPD X3, SUM   // psum += result[i]
   123  	ADDQ  $2, IDX   // IDX += 2
   124  	ADDQ  $2, I_IDX // I_IDX += 2
   125  	DECQ  TAIL      // --TAIL
   126  	JNZ   dot_tail  // }  while TAIL > 0
   127  
   128  dot_end:
   129  	MOVUPS SUM, sum+48(FP)
   130  	RET