mirror of
https://github.com/golang/go
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186 lines
5.0 KiB
ArmAsm
186 lines
5.0 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 approximation and other constants
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DATA ·exprodataL22<> + 0(SB)/8, $800.0E+00
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DATA ·exprodataL22<> + 8(SB)/8, $1.0000000000000022e+00
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DATA ·exprodataL22<> + 16(SB)/8, $0.500000000000004237e+00
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DATA ·exprodataL22<> + 24(SB)/8, $0.166666666630345592e+00
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DATA ·exprodataL22<> + 32(SB)/8, $0.138926439368309441e-02
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DATA ·exprodataL22<> + 40(SB)/8, $0.833349307718286047e-02
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DATA ·exprodataL22<> + 48(SB)/8, $0.416666664838056960e-01
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DATA ·exprodataL22<> + 56(SB)/8, $-.231904681384629956E-16
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DATA ·exprodataL22<> + 64(SB)/8, $-.693147180559945286E+00
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DATA ·exprodataL22<> + 72(SB)/8, $0.144269504088896339E+01
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DATA ·exprodataL22<> + 80(SB)/8, $704.0E+00
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GLOBL ·exprodataL22<> + 0(SB), RODATA, $88
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DATA ·expxinf<> + 0(SB)/8, $0x7ff0000000000000
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GLOBL ·expxinf<> + 0(SB), RODATA, $8
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DATA ·expx4ff<> + 0(SB)/8, $0x4ff0000000000000
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GLOBL ·expx4ff<> + 0(SB), RODATA, $8
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DATA ·expx2ff<> + 0(SB)/8, $0x2ff0000000000000
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GLOBL ·expx2ff<> + 0(SB), RODATA, $8
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DATA ·expxaddexp<> + 0(SB)/8, $0xc2f0000100003fef
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GLOBL ·expxaddexp<> + 0(SB), RODATA, $8
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// Log multipliers table
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DATA ·exptexp<> + 0(SB)/8, $0.442737824274138381E-01
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DATA ·exptexp<> + 8(SB)/8, $0.263602189790660309E-01
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DATA ·exptexp<> + 16(SB)/8, $0.122565642281703586E-01
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DATA ·exptexp<> + 24(SB)/8, $0.143757052860721398E-02
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DATA ·exptexp<> + 32(SB)/8, $-.651375034121276075E-02
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DATA ·exptexp<> + 40(SB)/8, $-.119317678849450159E-01
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DATA ·exptexp<> + 48(SB)/8, $-.150868749549871069E-01
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DATA ·exptexp<> + 56(SB)/8, $-.161992609578469234E-01
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DATA ·exptexp<> + 64(SB)/8, $-.154492360403337917E-01
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DATA ·exptexp<> + 72(SB)/8, $-.129850717389178721E-01
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DATA ·exptexp<> + 80(SB)/8, $-.892902649276657891E-02
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DATA ·exptexp<> + 88(SB)/8, $-.338202636596794887E-02
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DATA ·exptexp<> + 96(SB)/8, $0.357266307045684762E-02
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DATA ·exptexp<> + 104(SB)/8, $0.118665304327406698E-01
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DATA ·exptexp<> + 112(SB)/8, $0.214434994118118914E-01
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DATA ·exptexp<> + 120(SB)/8, $0.322580645161290314E-01
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GLOBL ·exptexp<> + 0(SB), RODATA, $128
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// Exp returns e**x, the base-e exponential of x.
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//
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// Special cases are:
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// Exp(+Inf) = +Inf
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// Exp(NaN) = NaN
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// Very large values overflow to 0 or +Inf.
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// Very small values underflow to 1.
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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 ·expAsm(SB), NOSPLIT, $0-16
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FMOVD x+0(FP), F0
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MOVD $·exprodataL22<>+0(SB), R5
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WORD $0xB3120000 //ltdbr %f0,%f0
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BLTU L20
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FMOVD F0, F2
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L2:
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WORD $0xED205050 //cdb %f2,.L23-.L22(%r5)
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BYTE $0x00
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BYTE $0x19
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BGE L16
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BVS L16
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WFCEDBS V2, V2, V2
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BVS LEXITTAGexp
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MOVD $·expxaddexp<>+0(SB), R1
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FMOVD 72(R5), F6
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FMOVD 0(R1), F2
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WFMSDB V0, V6, V2, V6
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FMOVD 64(R5), F4
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FADD F6, F2
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FMOVD 56(R5), F1
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FMADD F4, F2, F0
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FMOVD 48(R5), F3
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WFMADB V2, V1, V0, V2
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FMOVD 40(R5), F1
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FMOVD 32(R5), F4
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FMUL F0, F0
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WFMADB V2, V4, V1, V4
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WORD $0xB3CD0016 //lgdr %r1,%f6
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FMOVD 24(R5), F1
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WFMADB V2, V3, V1, V3
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FMOVD 16(R5), F1
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WFMADB V0, V4, V3, V4
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FMOVD 8(R5), F3
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WFMADB V2, V1, V3, V1
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WORD $0xEC3139BC //risbg %r3,%r1,57,128+60,3
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BYTE $0x03
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BYTE $0x55
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WFMADB V0, V4, V1, V0
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MOVD $·exptexp<>+0(SB), R2
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WORD $0x68432000 //ld %f4,0(%r3,%r2)
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FMADD F4, F2, F2
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SLD $48, R1, R2
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WFMADB V2, V0, V4, V2
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WORD $0xB3C10002 //ldgr %f0,%r2
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FMADD F0, F2, F0
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FMOVD F0, ret+8(FP)
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RET
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L16:
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WFCEDBS V2, V2, V4
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BVS LEXITTAGexp
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WORD $0xED205000 //cdb %f2,.L33-.L22(%r5)
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BYTE $0x00
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BYTE $0x19
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BLT L6
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WFCEDBS V2, V0, V0
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BVS L13
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MOVD $·expxinf<>+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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L20:
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WORD $0xB3130020 //lcdbr %f2,%f0
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BR L2
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L6:
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MOVD $·expxaddexp<>+0(SB), R1
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FMOVD 72(R5), F3
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FMOVD 0(R1), F4
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WFMSDB V0, V3, V4, V3
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FMOVD 64(R5), F6
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FADD F3, F4
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FMOVD 56(R5), F5
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WFMADB V4, V6, V0, V6
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FMOVD 32(R5), F1
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WFMADB V4, V5, V6, V4
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FMOVD 40(R5), F5
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FMUL F6, F6
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WFMADB V4, V1, V5, V1
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FMOVD 48(R5), F7
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WORD $0xB3CD0013 //lgdr %r1,%f3
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FMOVD 24(R5), F5
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WFMADB V4, V7, V5, V7
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FMOVD 16(R5), F5
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WFMADB V6, V1, V7, V1
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FMOVD 8(R5), F7
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WFMADB V4, V5, V7, V5
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WORD $0xEC3139BC //risbg %r3,%r1,57,128+60,3
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BYTE $0x03
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BYTE $0x55
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WFMADB V6, V1, V5, V6
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MOVD $·exptexp<>+0(SB), R2
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WFCHDBS V2, V0, V0
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WORD $0x68132000 //ld %f1,0(%r3,%r2)
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FMADD F1, F4, F4
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MOVD $0x4086000000000000, R2
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WFMADB V4, V6, V1, V4
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BEQ L21
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ADDW $0xF000, R1
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WORD $0xEC21000F //risbgn %r2,%r1,64-64+0,64-64+0+16-1,64-0-16
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BYTE $0x30
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BYTE $0x59
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WORD $0xB3C10002 //ldgr %f0,%r2
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FMADD F0, F4, F0
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MOVD $·expx4ff<>+0(SB), R3
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FMOVD 0(R3), F2
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FMUL F2, F0
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FMOVD F0, ret+8(FP)
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RET
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L13:
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FMOVD $0, F0
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FMOVD F0, ret+8(FP)
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RET
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L21:
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ADDW $0x1000, R1
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WORD $0xEC21000F //risbgn %r2,%r1,64-64+0,64-64+0+16-1,64-0-16
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BYTE $0x30
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BYTE $0x59
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WORD $0xB3C10002 //ldgr %f0,%r2
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FMADD F0, F4, F0
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MOVD $·expx2ff<>+0(SB), R3
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FMOVD 0(R3), F2
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FMUL F2, F0
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FMOVD F0, ret+8(FP)
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RET
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LEXITTAGexp:
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FMOVD F0, ret+8(FP)
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RET
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