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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
29 lines
941 B
ArmAsm
29 lines
941 B
ArmAsm
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// func Tan(x float64) float64
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TEXT ·Tan(SB),NOSPLIT,$0
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FMOVD x+0(FP), F0 // F0=x
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FPTAN // F0=1, F1=tan(x) if -2**63 < x < 2**63
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FSTSW AX // AX=status word
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ANDW $0x0400, AX
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JNE 4(PC) // jump if x outside range
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FMOVDP F0, F0 // F0=tan(x)
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FMOVDP F0, ret+8(FP)
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RET
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FLDPI // F0=Pi, F1=x
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FADDD F0, F0 // F0=2*Pi, F1=x
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FXCHD F0, F1 // F0=x, F1=2*Pi
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FPREM1 // F0=reduced_x, F1=2*Pi
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FSTSW AX // AX=status word
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ANDW $0x0400, AX
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JNE -3(PC) // jump if reduction incomplete
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FMOVDP F0, F1 // F0=reduced_x
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FPTAN // F0=1, F1=tan(reduced_x)
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FMOVDP F0, F0 // F0=tan(reduced_x)
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FMOVDP F0, ret+8(FP)
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RET
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