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Text file src/math/modf_386.s

Documentation: math

     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 Modf(f float64) (int float64, frac float64)
     8	TEXT ·Modf(SB),NOSPLIT,$0
     9		// special case for f == -0.0
    10		MOVL f_hi+4(FP), DX	// high word
    11		MOVL f_lo+0(FP), AX	// low word
    12		CMPL DX, $(1<<31)	// beginning of -0.0
    13		JNE notNegativeZero
    14		CMPL AX, $0			// could be denormalized
    15		JNE notNegativeZero
    16		MOVL AX, int_lo+8(FP)
    17		MOVL DX, int_hi+12(FP)
    18		MOVL AX, frac_lo+16(FP)
    19		MOVL DX, frac_hi+20(FP)
    20		RET
    21	notNegativeZero:
    22		FMOVD   f+0(FP), F0  // F0=f
    23		FMOVD   F0, F1       // F0=f, F1=f
    24		FSTCW   -2(SP)       // save old Control Word
    25		MOVW    -2(SP), AX
    26		ORW     $0x0c00, AX  // Rounding Control set to truncate
    27		MOVW    AX, -4(SP)   // store new Control Word
    28		FLDCW   -4(SP)       // load new Control Word
    29		FRNDINT              // F0=trunc(f), F1=f
    30		FLDCW   -2(SP)       // load old Control Word
    31		FSUBD   F0, F1       // F0=trunc(f), F1=f-trunc(f)
    32		FMOVDP  F0, int+8(FP)  // F0=f-trunc(f)
    33		FMOVDP  F0, frac+16(FP)
    34		RET

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