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Text file src/math/sin_386.s

Documentation: math

     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

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