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02/02/2024 06:09:55 PM
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abs.go
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acos_s390x.s
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acosh.go
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acosh_s390x.s
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all_test.go
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arith_s390x.go
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arith_s390x_test.go
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asin.go
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asin_s390x.s
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asinh.go
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asinh_s390x.s
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atan.go
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atan2.go
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atan2_s390x.s
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atan_s390x.s
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atanh.go
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atanh_s390x.s
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big
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bits
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bits.go
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cbrt.go
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cbrt_s390x.s
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cmplx
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const.go
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const_test.go
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copysign.go
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cosh_s390x.s
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dim.go
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dim_amd64.s
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dim_arm64.s
963 bytes
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dim_asm.go
344 bytes
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dim_noasm.go
410 bytes
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dim_riscv64.s
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dim_s390x.s
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erf.go
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erf_s390x.s
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erfc_s390x.s
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erfinv.go
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example_test.go
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exp.go
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exp2_asm.go
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exp2_noasm.go
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exp_amd64.go
261 bytes
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exp_amd64.s
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exp_arm64.s
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exp_asm.go
268 bytes
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exp_noasm.go
302 bytes
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exp_s390x.s
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expm1.go
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expm1_s390x.s
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export_s390x_test.go
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export_test.go
357 bytes
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floor.go
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floor_386.s
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floor_amd64.s
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floor_arm64.s
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floor_asm.go
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floor_noasm.go
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floor_ppc64x.s
499 bytes
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floor_s390x.s
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floor_wasm.s
459 bytes
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fma.go
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frexp.go
929 bytes
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gamma.go
5.53 KB
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huge_test.go
2.91 KB
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hypot.go
850 bytes
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hypot_386.s
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hypot_amd64.s
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hypot_asm.go
264 bytes
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hypot_noasm.go
297 bytes
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j0.go
13.6 KB
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j1.go
13.3 KB
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jn.go
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ldexp.go
1.05 KB
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lgamma.go
11.03 KB
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log.go
3.86 KB
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log10.go
873 bytes
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log10_s390x.s
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log1p.go
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log1p_s390x.s
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log_amd64.s
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log_asm.go
259 bytes
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log_s390x.s
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log_stub.go
292 bytes
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logb.go
1021 bytes
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mod.go
903 bytes
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modf.go
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modf_arm64.s
447 bytes
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modf_asm.go
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modf_noasm.go
326 bytes
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modf_ppc64x.s
416 bytes
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nextafter.go
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pow.go
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pow10.go
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pow_s390x.s
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rand
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remainder.go
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signbit.go
302 bytes
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sin.go
6.35 KB
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sin_s390x.s
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sincos.go
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sinh.go
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sinh_s390x.s
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sqrt.go
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stubs.go
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stubs_s390x.s
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tan.go
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tan_s390x.s
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tanh.go
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tanh_s390x.s
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trig_reduce.go
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unsafe.go
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Editing: exp_amd64.s
Close
// 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. #include "textflag.h" // The method is based on a paper by Naoki Shibata: "Efficient evaluation // methods of elementary functions suitable for SIMD computation", Proc. // of International Supercomputing Conference 2010 (ISC'10), pp. 25 -- 32 // (May 2010). The paper is available at // https://link.springer.com/article/10.1007/s00450-010-0108-2 // // The original code and the constants below are from the author's // implementation available at http://freshmeat.net/projects/sleef. // The README file says, "The software is in public domain. // You can use the software without any obligation." // // This code is a simplified version of the original. #define LN2 0.6931471805599453094172321214581766 // log_e(2) #define LOG2E 1.4426950408889634073599246810018920 // 1/LN2 #define LN2U 0.69314718055966295651160180568695068359375 // upper half LN2 #define LN2L 0.28235290563031577122588448175013436025525412068e-12 // lower half LN2 #define PosInf 0x7FF0000000000000 #define NegInf 0xFFF0000000000000 #define Overflow 7.09782712893384e+02 DATA exprodata<>+0(SB)/8, $0.5 DATA exprodata<>+8(SB)/8, $1.0 DATA exprodata<>+16(SB)/8, $2.0 DATA exprodata<>+24(SB)/8, $1.6666666666666666667e-1 DATA exprodata<>+32(SB)/8, $4.1666666666666666667e-2 DATA exprodata<>+40(SB)/8, $8.3333333333333333333e-3 DATA exprodata<>+48(SB)/8, $1.3888888888888888889e-3 DATA exprodata<>+56(SB)/8, $1.9841269841269841270e-4 DATA exprodata<>+64(SB)/8, $2.4801587301587301587e-5 GLOBL exprodata<>+0(SB), RODATA, $72 // func Exp(x float64) float64 TEXT ·archExp(SB),NOSPLIT,$0 // test bits for not-finite MOVQ x+0(FP), BX MOVQ $~(1<<63), AX // sign bit mask MOVQ BX, DX ANDQ AX, DX MOVQ $PosInf, AX CMPQ AX, DX JLE notFinite // check if argument will overflow MOVQ BX, X0 MOVSD $Overflow, X1 COMISD X1, X0 JA overflow MOVSD $LOG2E, X1 MULSD X0, X1 CVTSD2SL X1, BX // BX = exponent CVTSL2SD BX, X1 CMPB ·useFMA(SB), $1 JE avxfma MOVSD $LN2U, X2 MULSD X1, X2 SUBSD X2, X0 MOVSD $LN2L, X2 MULSD X1, X2 SUBSD X2, X0 // reduce argument MULSD $0.0625, X0 // Taylor series evaluation MOVSD exprodata<>+64(SB), X1 MULSD X0, X1 ADDSD exprodata<>+56(SB), X1 MULSD X0, X1 ADDSD exprodata<>+48(SB), X1 MULSD X0, X1 ADDSD exprodata<>+40(SB), X1 MULSD X0, X1 ADDSD exprodata<>+32(SB), X1 MULSD X0, X1 ADDSD exprodata<>+24(SB), X1 MULSD X0, X1 ADDSD exprodata<>+0(SB), X1 MULSD X0, X1 ADDSD exprodata<>+8(SB), X1 MULSD X1, X0 MOVSD exprodata<>+16(SB), X1 ADDSD X0, X1 MULSD X1, X0 MOVSD exprodata<>+16(SB), X1 ADDSD X0, X1 MULSD X1, X0 MOVSD exprodata<>+16(SB), X1 ADDSD X0, X1 MULSD X1, X0 MOVSD exprodata<>+16(SB), X1 ADDSD X0, X1 MULSD X1, X0 ADDSD exprodata<>+8(SB), X0 // return fr * 2**exponent ldexp: ADDL $0x3FF, BX // add bias JLE denormal CMPL BX, $0x7FF JGE overflow lastStep: SHLQ $52, BX MOVQ BX, X1 MULSD X1, X0 MOVSD X0, ret+8(FP) RET notFinite: // test bits for -Inf MOVQ $NegInf, AX CMPQ AX, BX JNE notNegInf // -Inf, return 0 underflow: // return 0 MOVQ $0, ret+8(FP) RET overflow: // return +Inf MOVQ $PosInf, BX notNegInf: // NaN or +Inf, return x MOVQ BX, ret+8(FP) RET denormal: CMPL BX, $-52 JL underflow ADDL $0x3FE, BX // add bias - 1 SHLQ $52, BX MOVQ BX, X1 MULSD X1, X0 MOVQ $1, BX JMP lastStep avxfma: MOVSD $LN2U, X2 VFNMADD231SD X2, X1, X0 MOVSD $LN2L, X2 VFNMADD231SD X2, X1, X0 // reduce argument MULSD $0.0625, X0 // Taylor series evaluation MOVSD exprodata<>+64(SB), X1 VFMADD213SD exprodata<>+56(SB), X0, X1 VFMADD213SD exprodata<>+48(SB), X0, X1 VFMADD213SD exprodata<>+40(SB), X0, X1 VFMADD213SD exprodata<>+32(SB), X0, X1 VFMADD213SD exprodata<>+24(SB), X0, X1 VFMADD213SD exprodata<>+0(SB), X0, X1 VFMADD213SD exprodata<>+8(SB), X0, X1 MULSD X1, X0 VADDSD exprodata<>+16(SB), X0, X1 MULSD X1, X0 VADDSD exprodata<>+16(SB), X0, X1 MULSD X1, X0 VADDSD exprodata<>+16(SB), X0, X1 MULSD X1, X0 VADDSD exprodata<>+16(SB), X0, X1 VFMADD213SD exprodata<>+8(SB), X1, X0 JMP ldexp