42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/*---------------------------------------------------------------------------+
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| shr_Xsig.S |
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| 12 byte right shift function |
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| Copyright (C) 1992,1994,1995 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@jacobi.maths.monash.edu.au |
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| Extended shift right function. |
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| Fastest for small shifts. |
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| Shifts the 12 byte quantity pointed to by the first arg (arg) |
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| right by the number of bits specified by the second arg (nr). |
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+---------------------------------------------------------------------------*/
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#include "fpu_emu.h"
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#include "poly.h"
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void shr_Xsig(Xsig *arg, const int nr)
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{
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int n = nr;
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while ( n >= 32 )
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{
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arg->lsw = arg->midw;
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arg->midw = arg->msw;
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arg->msw = 0;
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n -= 32;
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}
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if ( n <= 0 )
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return;
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arg->lsw = (arg->lsw >> n) | (arg->midw << (32-n));
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arg->midw = (arg->midw >> n) | (arg->msw << (32-n));
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arg->msw >>= n;
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}
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