176 lines
3.2 KiB
C
176 lines
3.2 KiB
C
/*
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* Sources of the "UNSIGNED ARITHMETIC" group instructions
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*/
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/* $Id$ */
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#include <em_abs.h>
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#include "logging.h"
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#include "global.h"
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#include "log.h"
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#include "mem.h"
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#include "trap.h"
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#include "warn.h"
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#include "text.h"
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#include "fra.h"
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/************************************************************************
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* No checking is performed, except for division by zero. *
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* The operands popped from the stack are put in unsigned *
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* longs. Now the required operation can be performed *
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* immediately. Whether the wordsize is two or four bytes *
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* doesn't matter. Alas, arithmetic is performed modulo *
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* the highest unsigned number for the given size plus 1. *
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************************************************************************/
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#ifdef LOGGING
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extern int must_test;
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#endif /* LOGGING */
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#define adu(w1,w2) (unsigned long)(w1 + w2)
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#define sbu(w1,w2) (unsigned long)(w1 - w2)
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#define mlu(w1,w2) (unsigned long)(w1 * w2)
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PRIVATE unsigned long dvu(), rmu(), slu(), sru();
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DoADU(l)
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register size l;
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{
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/* ADU w: Addition */
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register unsigned long t = upop(arg_wi(l));
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LOG(("@U6 DoADU(%ld)", l));
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spoilFRA();
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npush((long) adu(upop(l), t), l);
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}
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DoSBU(l)
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register size l;
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{
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/* SBU w: Subtraction */
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register unsigned long t = upop(arg_wi(l));
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LOG(("@U6 DoSBU(%ld)", l));
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spoilFRA();
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npush((long) sbu(upop(l), t), l);
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}
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DoMLU(l)
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register size l;
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{
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/* MLU w: Multiplication */
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register unsigned long t = upop(arg_wi(l));
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LOG(("@U6 DoMLU(%ld)", l));
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spoilFRA();
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npush((long) mlu(upop(l), t), l);
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}
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DoDVU(l)
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register size l;
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{
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/* DVU w: Division */
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register unsigned long t = upop(arg_wi(l));
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LOG(("@U6 DoDVU(%ld)", l));
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spoilFRA();
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npush((long) dvu(upop(l), t), l);
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}
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DoRMU(l)
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register size l;
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{
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/* RMU w: Remainder */
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register unsigned long t = upop(arg_wi(l));
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LOG(("@U6 DoRMU(%ld)", l));
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spoilFRA();
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npush((long) rmu(upop(l), t), l);
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}
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DoSLU(l)
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register size l;
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{
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/* SLU w: Shift left */
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register unsigned long t = uwpop();
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LOG(("@U6 DoSLU(%ld)", l));
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spoilFRA();
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l = arg_wi(l);
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npush((long) slu(upop(l), t, l), l);
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}
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DoSRU(l)
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register size l;
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{
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/* SRU w: Shift right */
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register unsigned long t = uwpop();
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LOG(("@U6 DoSRU(%ld)", l));
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spoilFRA();
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l = arg_wi(l);
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npush((long) sru(upop(l), t, l), l);
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}
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PRIVATE unsigned long dvu(w1, w2)
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unsigned long w1, w2;
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{
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if (w2 == 0) {
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if (!(IgnMask&BIT(EIDIVZ))) {
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trap(EIDIVZ);
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}
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else return (0L);
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}
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return (w1 / w2);
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}
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PRIVATE unsigned long rmu(w1, w2)
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unsigned long w1, w2;
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{
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if (w2 == 0) {
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if (!(IgnMask&BIT(EIDIVZ))) {
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trap(EIDIVZ);
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}
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else return (0L);
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}
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return (w1 % w2);
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}
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/*ARGSUSED*/
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PRIVATE unsigned long slu(w1, w2, nbytes) /* w1 << w2 */
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unsigned long w1, w2;
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size nbytes;
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{
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#ifdef LOGGING
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if (must_test) {
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/* check shift distance */
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if (w2 >= nbytes*8) {
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warning(WSHLARGE);
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w2 = nbytes*8 - 1;
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}
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}
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#endif /* LOGGING */
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/* calculate result */
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return (w1 << w2);
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}
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/*ARGSUSED*/
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PRIVATE unsigned long sru(w1, w2, nbytes) /* w1 >> w2 */
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unsigned long w1, w2;
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size nbytes;
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{
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#ifdef LOGGING
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if (must_test) {
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/* check shift distance */
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if (w2 >= nbytes*8) {
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warning(WSHLARGE);
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w2 = nbytes*8 - 1;
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}
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}
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#endif /* LOGGING */
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/* calculate result */
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return (w1 >> w2);
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}
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