Text file src/pkg/math/frexp_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 Frexp(f float64) (frac float64, exp int)
     8	TEXT ·Frexp(SB),NOSPLIT,$0
     9		FMOVD   f+0(FP), F0   // F0=f
    10		FXAM
    11		FSTSW   AX
    12		SAHF
    13		JNP     nan_zero_inf
    14		JCS     nan_zero_inf
    15		FXTRACT               // F0=f (0<=f<1), F1=e
    16		FMULD  $(0.5), F0     // F0=f (0.5<=f<1), F1=e
    17		FMOVDP  F0, frac+8(FP)   // F0=e
    18		FLD1                  // F0=1, F1=e
    19		FADDDP  F0, F1        // F0=e+1
    20		FMOVLP  F0, exp+16(FP)  // (int=int32)
    21		RET
    22	nan_zero_inf:
    23		FMOVDP  F0, frac+8(FP)   // F0=e
    24		MOVL    $0, exp+16(FP)  // exp=0
    25		RET

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