github.com/yukk001/go1.10.8@v0.0.0-20190813125351-6df2d3982e20/src/math/sin_386.s (about)

     1  // Copyright 2009 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  #include "textflag.h"
     6  
     7  // func Cos(x float64) float64
     8  TEXT ·Cos(SB),NOSPLIT,$0
     9  	FMOVD   x+0(FP), F0  // F0=x
    10  	FCOS                 // F0=cos(x) if -2**63 < x < 2**63
    11  	FSTSW   AX           // AX=status word
    12  	ANDW    $0x0400, AX
    13  	JNE     3(PC)        // jump if x outside range
    14  	FMOVDP  F0, ret+8(FP)
    15  	RET
    16  	FLDPI                // F0=Pi, F1=x
    17  	FADDD   F0, F0       // F0=2*Pi, F1=x
    18  	FXCHD   F0, F1       // F0=x, F1=2*Pi
    19  	FPREM1               // F0=reduced_x, F1=2*Pi
    20  	FSTSW   AX           // AX=status word
    21  	ANDW    $0x0400, AX
    22  	JNE     -3(PC)       // jump if reduction incomplete
    23  	FMOVDP  F0, F1       // F0=reduced_x
    24  	FCOS                 // F0=cos(reduced_x)
    25  	FMOVDP  F0, ret+8(FP)
    26  	RET
    27  	
    28  // func Sin(x float64) float64
    29  TEXT ·Sin(SB),NOSPLIT,$0
    30  	FMOVD   x+0(FP), F0  // F0=x
    31  	FSIN                 // F0=sin(x) if -2**63 < x < 2**63
    32  	FSTSW   AX           // AX=status word
    33  	ANDW    $0x0400, AX
    34  	JNE     3(PC)        // jump if x outside range
    35  	FMOVDP  F0, ret+8(FP)
    36  	RET
    37  	FLDPI                // F0=Pi, F1=x
    38  	FADDD   F0, F0       // F0=2*Pi, F1=x
    39  	FXCHD   F0, F1       // F0=x, F1=2*Pi
    40  	FPREM1               // F0=reduced_x, F1=2*Pi
    41  	FSTSW   AX           // AX=status word
    42  	ANDW    $0x0400, AX
    43  	JNE     -3(PC)       // jump if reduction incomplete
    44  	FMOVDP  F0, F1       // F0=reduced_x
    45  	FSIN                 // F0=sin(reduced_x)
    46  	FMOVDP  F0, ret+8(FP)
    47  	RET