44 lines
782 B
C
44 lines
782 B
C
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Id$ */
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#include "flt_misc.h"
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void flt_b64_sft(
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register struct flt_mantissa *e,
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register int n)
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{
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if (n > 63 || n < -63) {
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e->flt_l_32 = 0;
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e->flt_h_32 = 0;
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return;
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}
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if (n >= 32) {
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e->flt_l_32 = e->flt_h_32;
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e->flt_h_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e->flt_l_32 >>= n;
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if (e->flt_h_32 != 0) {
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e->flt_l_32 |= (e->flt_h_32 << (32 - n));
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e->flt_h_32 >>= n;
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}
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}
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n = -n;
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if (n >= 32) {
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e->flt_h_32 = e->flt_l_32;
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e->flt_l_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e->flt_h_32 <<= n;
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if (e->flt_l_32 != 0) {
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e->flt_h_32 |= (e->flt_l_32 >> (32 - n));
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e->flt_l_32 <<= n;
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}
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}
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}
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