100 lines
2 KiB
C
100 lines
2 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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DoINN(l)
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register size l;
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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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LOG(("@Y6 DoINN(%ld)", l));
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spoilFRA();
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bit_test(arg_w(l));
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}
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DoSET(l)
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register size l;
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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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LOG(("@Y6 DoSET(%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) swpop(); /* bitno on TOS */
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register char test_byte = (char) 0;/* default value to be tested */
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register int wordoff = bitno / 8;
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register int bitoff = bitno % 8;
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if (bitoff < 0) bitoff += 8;
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if (must_test && !(IgnMask&BIT(ESET))) {
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/* Only w*8 bits CAN be tested */
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if (wordoff >= w) {
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trap(ESET);
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}
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}
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test_byte = stack_loc(SP + wordoff);
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st_dec(w);
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wpush((long)((test_byte & BIT(bitoff)) ? 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) swpop();
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register size nbytes = w;
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register int wordoff = bitno / 8;
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register int bitoff = bitno % 8;
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if (bitoff < 0) bitoff += 8;
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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 (wordoff >= w) {
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trap(ESET);
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}
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}
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st_stn(SP + wordoff, (long)BIT(bitoff), 1L);
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}
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