76 lines
1.5 KiB
C
76 lines
1.5 KiB
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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/* $Header$ */
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#include "misc.h"
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b64_sft(e,n)
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register struct _mantissa *e;
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register int n;
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{
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if (n > 0) {
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if (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 = (e->flt_l_32 >> 1) & 0x7FFFFFFF;
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e->flt_l_32 >>= (n - 1);
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if (e->flt_h_32 != 0) {
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e->flt_l_32 |= (e->flt_h_32 << (32 - n)) & 0xFFFFFFFF;
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e->flt_h_32 = (e->flt_h_32 >> 1) & 0x7FFFFFFF;
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e->flt_h_32 >>= (n - 1);
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}
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}
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return;
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}
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n = -n;
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if (n > 0) {
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if (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_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 = (e->flt_h_32 << n) & 0xFFFFFFFF;
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if (e->flt_l_32 != 0) {
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long l = (e->flt_l_32 >> 1) & 0x7FFFFFFF;
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e->flt_h_32 |= (l >> (31 - n));
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e->flt_l_32 = (e->flt_l_32 << n) & 0xFFFFFFFF;
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}
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}
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}
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}
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b64_lsft(e)
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register struct _mantissa *e;
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{
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/* shift left 1 bit */
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e->flt_h_32 = (e->flt_h_32 << 1) & 0xFFFFFFFF;
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if (e->flt_l_32 & 0x80000000L) e->flt_h_32 |= 1;
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e->flt_l_32 = (e->flt_l_32 << 1) & 0xFFFFFFFF;
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}
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b64_rsft(e)
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register struct _mantissa *e;
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{
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/* shift right 1 bit */
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e->flt_l_32 = (e->flt_l_32 >> 1) & 0x7FFFFFFF;
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if (e->flt_h_32 & 1) e->flt_l_32 |= 0x80000000L;
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e->flt_h_32 = (e->flt_h_32 >> 1) & 0x7FFFFFFF;
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}
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