mirror of https://github.com/bochs-emu/Bochs
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*---------------------------------------------------------------------------+
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| reg_norm.c |
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| $Id: reg_norm.c,v 1.2 2001-10-06 03:53:46 bdenney Exp $
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| Copyright (C) 1992,1993,1994,1995,1997,1999 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@melbpc.org.au |
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| Normalize the value in a FPU_REG. |
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| Return value is the tag of the answer. |
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+---------------------------------------------------------------------------*/
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#include "fpu_emu.h"
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int FPU_normalize_nuo(FPU_REG *x, int bias)
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{
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if ( ! (x->sigh & 0x80000000) )
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{
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if ( x->sigh == 0 )
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{
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if ( x->sigl == 0 )
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{
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x->exp = EXP_UNDER;
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return TAG_Zero;
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}
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x->sigh = x->sigl;
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x->sigl = 0;
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x->exp -= 32;
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}
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while ( !(x->sigh & 0x80000000) )
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{
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x->sigh <<= 1;
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if ( x->sigl & 0x80000000 )
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x->sigh |= 1;
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x->sigl <<= 1;
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x->exp --;
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}
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}
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x->exp += bias;
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return TAG_Valid;
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}
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