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https://github.com/golang/go
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111 lines
2.8 KiB
ArmAsm
111 lines
2.8 KiB
ArmAsm
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// Copyright 2017 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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// Minimax polynomial approximations
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DATA ·tanrodataL13<> + 0(SB)/8, $0.181017336383229927e-07
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DATA ·tanrodataL13<> + 8(SB)/8, $-.256590857271311164e-03
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DATA ·tanrodataL13<> + 16(SB)/8, $-.464359274328689195e+00
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DATA ·tanrodataL13<> + 24(SB)/8, $1.0
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DATA ·tanrodataL13<> + 32(SB)/8, $-.333333333333333464e+00
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DATA ·tanrodataL13<> + 40(SB)/8, $0.245751217306830032e-01
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DATA ·tanrodataL13<> + 48(SB)/8, $-.245391301343844510e-03
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DATA ·tanrodataL13<> + 56(SB)/8, $0.214530914428992319e-01
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DATA ·tanrodataL13<> + 64(SB)/8, $0.108285667160535624e-31
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DATA ·tanrodataL13<> + 72(SB)/8, $0.612323399573676480e-16
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DATA ·tanrodataL13<> + 80(SB)/8, $0.157079632679489656e+01
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DATA ·tanrodataL13<> + 88(SB)/8, $0.636619772367581341e+00
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GLOBL ·tanrodataL13<> + 0(SB), RODATA, $96
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// Constants
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DATA ·tanxnan<> + 0(SB)/8, $0x7ff8000000000000
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GLOBL ·tanxnan<> + 0(SB), RODATA, $8
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DATA ·tanxlim<> + 0(SB)/8, $0x432921fb54442d19
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GLOBL ·tanxlim<> + 0(SB), RODATA, $8
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DATA ·tanxadd<> + 0(SB)/8, $0xc338000000000000
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GLOBL ·tanxadd<> + 0(SB), RODATA, $8
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// Tan returns the tangent of the radian argument.
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//
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// Special cases are:
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// Tan(±0) = ±0
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// Tan(±Inf) = NaN
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// Tan(NaN) = NaN
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// The algorithm used is minimax polynomial approximation using a table of
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// polynomial coefficients determined with a Remez exchange algorithm.
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TEXT ·tanAsm(SB), NOSPLIT, $0-16
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FMOVD x+0(FP), F0
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//specail case Tan(±0) = ±0
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FMOVD $(0.0), F1
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FCMPU F0, F1
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BEQ atanIsZero
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MOVD $·tanrodataL13<>+0(SB), R5
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WORD $0xB3120000 //ltdbr %f0,%f0
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BLTU L10
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FMOVD F0, F2
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L2:
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MOVD $·tanxlim<>+0(SB), R1
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WORD $0xED201000 //cdb %f2,0(%r1)
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BYTE $0x00
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BYTE $0x19
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BGE L11
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BVS L11
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MOVD $·tanxadd<>+0(SB), R1
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FMOVD 88(R5), F6
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FMOVD 0(R1), F4
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WFMSDB V0, V6, V4, V6
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FMOVD 80(R5), F1
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FADD F6, F4
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FMOVD 72(R5), F2
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FMSUB F1, F4, F0
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FMOVD 64(R5), F3
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WFMADB V4, V2, V0, V2
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FMOVD 56(R5), F1
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WFMADB V4, V3, V2, V4
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FMUL F2, F2
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VLEG $0, 48(R5), V18
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WORD $0xB3CD0016 //lgdr %r1,%f6
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FMOVD 40(R5), F5
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FMOVD 32(R5), F3
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FMADD F1, F2, F3
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FMOVD 24(R5), F1
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FMOVD 16(R5), F7
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FMOVD 8(R5), F0
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WFMADB V2, V7, V1, V7
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WFMADB V2, V0, V5, V0
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WFMDB V2, V2, V1
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FMOVD 0(R5), F5
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WFLCDB V4, V16
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WFMADB V2, V5, V18, V5
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WFMADB V1, V0, V7, V0
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WORD $0xA7110001 //tmll %r1,1
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WFMADB V1, V5, V3, V1
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BNE L12
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WFDDB V0, V1, V0
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WFMDB V2, V16, V2
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WFMADB V2, V0, V4, V0
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WORD $0xB3130000 //lcdbr %f0,%f0
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FMOVD F0, ret+8(FP)
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RET
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L12:
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WFMSDB V2, V1, V0, V2
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WFMDB V16, V2, V2
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FDIV F2, F0
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FMOVD F0, ret+8(FP)
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RET
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L11:
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MOVD $·tanxnan<>+0(SB), R1
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FMOVD 0(R1), F0
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FMOVD F0, ret+8(FP)
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RET
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L10:
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WORD $0xB3130020 //lcdbr %f2,%f0
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BR L2
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atanIsZero:
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FMOVD F0, ret+8(FP)
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RET
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