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// 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" // func Log1p(x float64) float64 TEXT ·Log1p(SB),NOSPLIT,$0 FMOVD $(2.928932188134524e-01), F0 FMOVD x+0(FP), F0 // F0=x, F1=1-sqrt(2)/2 = 0.29289321881345247559915564 FABS // F0=|x|, F1=1-sqrt(2)/2 FUCOMPP F0, F1 // compare F0 to F1 FSTSW AX FLDLN2 // F0=log(2) ANDW $0x0100, AX JEQ use_fyl2x // jump if F0 >= F1 FMOVD x+0(FP), F0 // F0=x, F1=log(2) FYL2XP1 // F0=log(1+x)=log2(1+x)*log(2) FMOVDP F0, ret+8(FP) RET use_fyl2x: FLD1 // F0=1, F2=log(2) FADDD x+0(FP), F0 // F0=1+x, F1=log(2) FYL2X // F0=log(1+x)=log2(1+x)*log(2) FMOVDP F0, ret+8(FP) RET