mirror of
https://github.com/golang/go
synced 2024-10-05 08:21:22 -06:00
718be3215f
(eliminate assumption of package global name space, make code easier to move between packages). R=r CC=golang-dev https://golang.org/cl/194072
27 lines
909 B
ArmAsm
27 lines
909 B
ArmAsm
// Copyright 2010 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.
|
|
|
|
// func Tan(x float64) float64
|
|
TEXT ·Tan(SB),7,$0
|
|
FMOVD x+0(FP), F0 // F0=x
|
|
FPTAN // F0=1, F1=tan(x) if -2**63 < x < 2**63
|
|
FSTSW AX // AX=status word
|
|
ANDW $0x0400, AX
|
|
JNE 4(PC) // jump if x outside range
|
|
FMOVDP F0, F0 // F0=tan(x)
|
|
FMOVDP F0, r+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
|
|
FPTAN // F0=1, F1=tan(reduced_x)
|
|
FMOVDP F0, F0 // F0=tan(reduced_x)
|
|
FMOVDP F0, r+8(FP)
|
|
RET
|