138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
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* Sources of the "SETS" group instructions
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*/
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/* $Header$ */
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#include <em_abs.h>
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#include "global.h"
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#include "log.h"
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#include "trap.h"
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#include "mem.h"
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#include "text.h"
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#include "fra.h"
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PRIVATE bit_test(), create_set();
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DoINNl2(arg)
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size arg;
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{
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/* INN w: Bit test on w byte set (bit number on top of stack) */
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register size l = (L_arg_2() * arg);
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LOG(("@Y6 DoINNl2(%ld)", l));
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spoilFRA();
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bit_test(arg_w(l));
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}
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DoINNs(hob, wfac)
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long hob;
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size wfac;
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{
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/* INN w: Bit test on w byte set (bit number on top of stack) */
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register size l = (S_arg(hob) * wfac);
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LOG(("@Y6 DoINNs(%ld)", l));
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spoilFRA();
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bit_test(arg_w(l));
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}
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DoINNz()
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{
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/* INN w: Bit test on w byte set (bit number on top of stack) */
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register size l = upop(wsize);
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LOG(("@Y6 DoINNz(%ld)", l));
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spoilFRA();
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bit_test(arg_w(l));
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}
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DoSETl2(arg)
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size arg;
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{
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/* SET w: Create singleton w byte set with bit n on (n is top of stack) */
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register size l = (L_arg_2() * arg);
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LOG(("@Y6 DoSETl2(%ld)", l));
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spoilFRA();
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create_set(arg_w(l));
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}
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DoSETs(hob, wfac)
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long hob;
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size wfac;
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{
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/* SET w: Create singleton w byte set with bit n on (n is top of stack) */
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register size l = (S_arg(hob) * wfac);
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LOG(("@Y6 DoSETs(%ld)", l));
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spoilFRA();
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create_set(arg_w(l));
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}
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DoSETz()
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{
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/* SET w: Create singleton w byte set with bit n on (n is top of stack) */
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register size l = upop(wsize);
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LOG(("@Y6 DoSETz(%ld)", l));
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spoilFRA();
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create_set(arg_w(l));
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}
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/********************************************************
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* bit testing *
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* *
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* Tests whether the bit with number to be found *
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* on TOS is on in 'w'-byte set. *
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* ON --> push 1 on stack. *
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* OFF -> push 0 on stack. *
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********************************************************/
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PRIVATE bit_test(w)
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size w;
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{
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register int bitno =
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(int) spop(wsize); /* bitno on TOS */
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register char test_byte = (char) 0;/* default value to be tested */
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if (must_test && !(IgnMask&BIT(ESET))) {
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/* Only w<<3 bytes CAN be tested */
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if (bitno > (int) ((w << 3) - 1)) {
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trap(ESET);
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}
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}
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test_byte = stack_loc(SP + (bitno >> 3));
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st_dec(w);
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wpush((long)((test_byte & BIT(bitno & 7)) ? 1 : 0));
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}
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/********************************************************
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* set creation *
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* *
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* Creates a singleton 'w'-byte set with as *
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* singleton member, the bit with number on *
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* TOS. The w bytes constituting the set are *
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* pushed on the stack. *
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********************************************************/
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PRIVATE create_set(w)
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size w;
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{
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register int bitno = (int) spop(wsize);
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register size nbytes = w;
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st_inc(nbytes);
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while (--nbytes >= 0) {
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st_stn(SP + nbytes, 0L, 1L);
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}
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if (must_test && !(IgnMask&BIT(ESET))) {
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if (bitno > (int) ((w << 3) - 1)) {
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trap(ESET);
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}
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}
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st_stn(SP + (bitno >> 3), (long)BIT(bitno & 7), 1L);
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}
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