1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// func Cos(x float64) float64
TEXT ·Cos(SB),NOSPLIT,$0
FMOVD x+0(FP), F0 // F0=x
FCOS // F0=cos(x) if -2**63 < x < 2**63
FSTSW AX // AX=status word
ANDW $0x0400, AX
JNE 3(PC) // jump if x outside range
FMOVDP F0, ret+8(FP)
RET
FLDPI // F0=Pi, F1=x
FADDD F0, F0 // F0=2*Pi, F1=x
FXCHD F0, F1 // F0=x, F1=2*Pi
FPREM1 // F0=reduced_x, F1=2*Pi
FSTSW AX // AX=status word
ANDW $0x0400, AX
JNE -3(PC) // jump if reduction incomplete
FMOVDP F0, F1 // F0=reduced_x
FCOS // F0=cos(reduced_x)
FMOVDP F0, ret+8(FP)
RET
// func Sin(x float64) float64
TEXT ·Sin(SB),NOSPLIT,$0
FMOVD x+0(FP), F0 // F0=x
FSIN // F0=sin(x) if -2**63 < x < 2**63
FSTSW AX // AX=status word
ANDW $0x0400, AX
JNE 3(PC) // jump if x outside range
FMOVDP F0, ret+8(FP)
RET
FLDPI // F0=Pi, F1=x
FADDD F0, F0 // F0=2*Pi, F1=x
FXCHD F0, F1 // F0=x, F1=2*Pi
FPREM1 // F0=reduced_x, F1=2*Pi
FSTSW AX // AX=status word
ANDW $0x0400, AX
JNE -3(PC) // jump if reduction incomplete
FMOVDP F0, F1 // F0=reduced_x
FSIN // F0=sin(reduced_x)
FMOVDP F0, ret+8(FP)
RET
|
