| // Copyright 2017 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" |
| |
| // Minimax polynomial approximation and other constants |
| DATA ·exprodataL22<> + 0(SB)/8, $800.0E+00 |
| DATA ·exprodataL22<> + 8(SB)/8, $1.0000000000000022e+00 |
| DATA ·exprodataL22<> + 16(SB)/8, $0.500000000000004237e+00 |
| DATA ·exprodataL22<> + 24(SB)/8, $0.166666666630345592e+00 |
| DATA ·exprodataL22<> + 32(SB)/8, $0.138926439368309441e-02 |
| DATA ·exprodataL22<> + 40(SB)/8, $0.833349307718286047e-02 |
| DATA ·exprodataL22<> + 48(SB)/8, $0.416666664838056960e-01 |
| DATA ·exprodataL22<> + 56(SB)/8, $-.231904681384629956E-16 |
| DATA ·exprodataL22<> + 64(SB)/8, $-.693147180559945286E+00 |
| DATA ·exprodataL22<> + 72(SB)/8, $0.144269504088896339E+01 |
| DATA ·exprodataL22<> + 80(SB)/8, $704.0E+00 |
| GLOBL ·exprodataL22<> + 0(SB), RODATA, $88 |
| |
| DATA ·expxinf<> + 0(SB)/8, $0x7ff0000000000000 |
| GLOBL ·expxinf<> + 0(SB), RODATA, $8 |
| DATA ·expx4ff<> + 0(SB)/8, $0x4ff0000000000000 |
| GLOBL ·expx4ff<> + 0(SB), RODATA, $8 |
| DATA ·expx2ff<> + 0(SB)/8, $0x2ff0000000000000 |
| GLOBL ·expx2ff<> + 0(SB), RODATA, $8 |
| DATA ·expxaddexp<> + 0(SB)/8, $0xc2f0000100003fef |
| GLOBL ·expxaddexp<> + 0(SB), RODATA, $8 |
| |
| // Log multipliers table |
| DATA ·exptexp<> + 0(SB)/8, $0.442737824274138381E-01 |
| DATA ·exptexp<> + 8(SB)/8, $0.263602189790660309E-01 |
| DATA ·exptexp<> + 16(SB)/8, $0.122565642281703586E-01 |
| DATA ·exptexp<> + 24(SB)/8, $0.143757052860721398E-02 |
| DATA ·exptexp<> + 32(SB)/8, $-.651375034121276075E-02 |
| DATA ·exptexp<> + 40(SB)/8, $-.119317678849450159E-01 |
| DATA ·exptexp<> + 48(SB)/8, $-.150868749549871069E-01 |
| DATA ·exptexp<> + 56(SB)/8, $-.161992609578469234E-01 |
| DATA ·exptexp<> + 64(SB)/8, $-.154492360403337917E-01 |
| DATA ·exptexp<> + 72(SB)/8, $-.129850717389178721E-01 |
| DATA ·exptexp<> + 80(SB)/8, $-.892902649276657891E-02 |
| DATA ·exptexp<> + 88(SB)/8, $-.338202636596794887E-02 |
| DATA ·exptexp<> + 96(SB)/8, $0.357266307045684762E-02 |
| DATA ·exptexp<> + 104(SB)/8, $0.118665304327406698E-01 |
| DATA ·exptexp<> + 112(SB)/8, $0.214434994118118914E-01 |
| DATA ·exptexp<> + 120(SB)/8, $0.322580645161290314E-01 |
| GLOBL ·exptexp<> + 0(SB), RODATA, $128 |
| |
| // Exp returns e**x, the base-e exponential of x. |
| // |
| // Special cases are: |
| // Exp(+Inf) = +Inf |
| // Exp(NaN) = NaN |
| // Very large values overflow to 0 or +Inf. |
| // Very small values underflow to 1. |
| // The algorithm used is minimax polynomial approximation using a table of |
| // polynomial coefficients determined with a Remez exchange algorithm. |
| |
| TEXT ·expAsm(SB), NOSPLIT, $0-16 |
| FMOVD x+0(FP), F0 |
| MOVD $·exprodataL22<>+0(SB), R5 |
| LTDBR F0, F0 |
| BLTU L20 |
| FMOVD F0, F2 |
| L2: |
| WORD $0xED205050 //cdb %f2,.L23-.L22(%r5) |
| BYTE $0x00 |
| BYTE $0x19 |
| BGE L16 |
| BVS L16 |
| WFCEDBS V2, V2, V2 |
| BVS LEXITTAGexp |
| MOVD $·expxaddexp<>+0(SB), R1 |
| FMOVD 72(R5), F6 |
| FMOVD 0(R1), F2 |
| WFMSDB V0, V6, V2, V6 |
| FMOVD 64(R5), F4 |
| FADD F6, F2 |
| FMOVD 56(R5), F1 |
| FMADD F4, F2, F0 |
| FMOVD 48(R5), F3 |
| WFMADB V2, V1, V0, V2 |
| FMOVD 40(R5), F1 |
| FMOVD 32(R5), F4 |
| FMUL F0, F0 |
| WFMADB V2, V4, V1, V4 |
| LGDR F6, R1 |
| FMOVD 24(R5), F1 |
| WFMADB V2, V3, V1, V3 |
| FMOVD 16(R5), F1 |
| WFMADB V0, V4, V3, V4 |
| FMOVD 8(R5), F3 |
| WFMADB V2, V1, V3, V1 |
| RISBGZ $57, $60, $3, R1, R3 |
| WFMADB V0, V4, V1, V0 |
| MOVD $·exptexp<>+0(SB), R2 |
| WORD $0x68432000 //ld %f4,0(%r3,%r2) |
| FMADD F4, F2, F2 |
| SLD $48, R1, R2 |
| WFMADB V2, V0, V4, V2 |
| LDGR R2, F0 |
| FMADD F0, F2, F0 |
| FMOVD F0, ret+8(FP) |
| RET |
| L16: |
| WFCEDBS V2, V2, V4 |
| BVS LEXITTAGexp |
| WORD $0xED205000 //cdb %f2,.L33-.L22(%r5) |
| BYTE $0x00 |
| BYTE $0x19 |
| BLT L6 |
| WFCEDBS V2, V0, V0 |
| BVS L13 |
| MOVD $·expxinf<>+0(SB), R1 |
| FMOVD 0(R1), F0 |
| FMOVD F0, ret+8(FP) |
| RET |
| L20: |
| WORD $0xB3130020 //lcdbr %f2,%f0 |
| BR L2 |
| L6: |
| MOVD $·expxaddexp<>+0(SB), R1 |
| FMOVD 72(R5), F3 |
| FMOVD 0(R1), F4 |
| WFMSDB V0, V3, V4, V3 |
| FMOVD 64(R5), F6 |
| FADD F3, F4 |
| FMOVD 56(R5), F5 |
| WFMADB V4, V6, V0, V6 |
| FMOVD 32(R5), F1 |
| WFMADB V4, V5, V6, V4 |
| FMOVD 40(R5), F5 |
| FMUL F6, F6 |
| WFMADB V4, V1, V5, V1 |
| FMOVD 48(R5), F7 |
| LGDR F3, R1 |
| FMOVD 24(R5), F5 |
| WFMADB V4, V7, V5, V7 |
| FMOVD 16(R5), F5 |
| WFMADB V6, V1, V7, V1 |
| FMOVD 8(R5), F7 |
| WFMADB V4, V5, V7, V5 |
| RISBGZ $57, $60, $3, R1, R3 |
| WFMADB V6, V1, V5, V6 |
| MOVD $·exptexp<>+0(SB), R2 |
| WFCHDBS V2, V0, V0 |
| WORD $0x68132000 //ld %f1,0(%r3,%r2) |
| FMADD F1, F4, F4 |
| MOVD $0x4086000000000000, R2 |
| WFMADB V4, V6, V1, V4 |
| BEQ L21 |
| ADDW $0xF000, R1 |
| RISBGN $0, $15, $48, R1, R2 |
| LDGR R2, F0 |
| FMADD F0, F4, F0 |
| MOVD $·expx4ff<>+0(SB), R3 |
| FMOVD 0(R3), F2 |
| FMUL F2, F0 |
| FMOVD F0, ret+8(FP) |
| RET |
| L13: |
| FMOVD $0, F0 |
| FMOVD F0, ret+8(FP) |
| RET |
| L21: |
| ADDW $0x1000, R1 |
| RISBGN $0, $15, $48, R1, R2 |
| LDGR R2, F0 |
| FMADD F0, F4, F0 |
| MOVD $·expx2ff<>+0(SB), R3 |
| FMOVD 0(R3), F2 |
| FMUL F2, F0 |
| FMOVD F0, ret+8(FP) |
| RET |
| LEXITTAGexp: |
| FMOVD F0, ret+8(FP) |
| RET |
