Text file src/pkg/math/log1p_386.s

     1	// Copyright 2010 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include "textflag.h"
     6	
     7	// func Log1p(x float64) float64
     8	TEXT ·Log1p(SB),NOSPLIT,$0
     9		FMOVD   $(2.928932188134524e-01), F0
    10		FMOVD   x+0(FP), F0  // F0=x, F1=1-sqrt(2)/2 = 0.29289321881345247559915564
    11		FABS                 // F0=|x|, F1=1-sqrt(2)/2
    12		FUCOMPP F0, F1       // compare F0 to F1
    13		FSTSW   AX
    14		FLDLN2               // F0=log(2)
    15		ANDW    $0x0100, AX
    16		JEQ     use_fyl2x    // jump if F0 >= F1
    17		FMOVD   x+0(FP), F0  // F0=x, F1=log(2)
    18		FYL2XP1              // F0=log(1+x)=log2(1+x)*log(2)
    19		FMOVDP  F0, ret+8(FP)
    20		RET
    21	use_fyl2x:
    22		FLD1                 // F0=1, F2=log(2)
    23		FADDD   x+0(FP), F0  // F0=1+x, F1=log(2)
    24		FYL2X                // F0=log(1+x)=log2(1+x)*log(2)
    25		FMOVDP  F0, ret+8(FP)
    26		RET
    27	

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