61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
/*
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* (c) copyright 1987 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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#define RCSID5 "$Header$"
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/*
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* Zilog Z80 special routines
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*/
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xyreg(r,byte) {
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if (r==IX)
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emit1(0335);
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else if (r==IY)
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emit1(0375);
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else if (r!=HL)
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serror("register error");
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emit1(byte);
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}
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xymem(r,byte) {
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xyreg(r,byte);
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if (r != HL) {
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_ind);
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newrelo(exp_ind.typ, RELO1);
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#endif
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emit1(exp_ind.val);
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}
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}
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branch(opc,exp) register opc; expr_t exp; {
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register sm,dist;
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dist = exp.val - (DOTVAL + 2);
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if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
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dist -= DOTGAIN;
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sm = fitb(dist);
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if ((exp.typ & ~S_DOT) != DOTTYP)
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sm = 0;
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if (opc == 020) { /* DJNZ must be short */
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fit(sm);
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sm = 1;
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} else if ((sm = small(sm,1)) == 0) {
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if (opc == 030) /* 'JR exp' */
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opc = 0303; /* replace by 'JP exp' */
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else /* 'JR CC,exp' */
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opc ^= 0342; /* replace by 'JP CC,exp' */
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}
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emit1(opc);
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if (sm == 0) {
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#ifdef RELOCATION
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newrelo(exp.typ, RELPC | RELO2);
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#endif
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emit2(exp.val);
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} else {
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emit1(lowb(dist));
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}
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}
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