103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/*
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* (c) copyright 1989 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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/* C O N S T A N T E X P R E S S I O N H A N D L I N G */
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/* F O R F L O A T I N G P O I N T N U M B E R S */
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#include "debug.h"
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#include "assert.h"
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#include <alloc.h>
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#include "trgt_sizes.h"
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#include "idf.h"
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#include <flt_arith.h>
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#include "arith.h"
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#include "type.h"
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#include "label.h"
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#include "expr.h"
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#include "sizes.h"
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#include "Lpars.h"
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extern int ResultKnown;
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extern char *symbol2str();
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fltcstbin(expp, oper, expr)
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register struct expr **expp, *expr;
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{
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/* The operation oper is performed on the constant
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expressions *expp(ld) and expr(ct), and the result restored in
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*expp.
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*/
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flt_arith o1, o2;
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int compar = 0;
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int cmpval = 0;
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o1 = (*expp)->FL_ARITH;
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o2 = expr->FL_ARITH;
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ASSERT(is_fp_cst(*expp) && is_fp_cst(expr));
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switch (oper) {
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case '*':
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flt_mul(&o1, &o2, &o1);
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break;
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case '/':
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flt_div(&o1, &o2, &o1);
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break;
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case '+':
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flt_add(&o1, &o2, &o1);
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break;
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case '-':
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flt_sub(&o1, &o2, &o1);
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break;
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case '<':
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case '>':
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case LESSEQ:
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case GREATEREQ:
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case EQUAL:
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case NOTEQUAL:
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compar++;
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cmpval = flt_cmp(&o1, &o2);
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switch(oper) {
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case '<': cmpval = (cmpval < 0); break;
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case '>': cmpval = (cmpval > 0); break;
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case LESSEQ: cmpval = (cmpval <= 0); break;
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case GREATEREQ: cmpval = (cmpval >= 0); break;
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case EQUAL: cmpval = (cmpval == 0); break;
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case NOTEQUAL: cmpval = (cmpval != 0); break;
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}
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break;
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default:
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/* in case of situations like a += 3.0; where a undefined */
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flt_status = 0;
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break;
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}
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switch (flt_status) {
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case 0:
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case FLT_UNFL: /* ignore underflow */
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break;
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case FLT_OVFL:
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if (!ResultKnown)
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expr_warning(expr,"floating point overflow on %s"
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, symbol2str(oper));
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break;
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case FLT_DIV0:
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if (!ResultKnown)
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expr_error(expr,"division by 0.0");
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else
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expr_warning(expr,"division by 0.0");
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break;
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default: /* there can't be another status */
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crash("(fltcstoper) bad status");
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}
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if (compar) {
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fill_int_expr(*expp, (arith)cmpval, INT);
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} else {
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(*expp)->FL_ARITH = o1;
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}
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(*expp)->ex_flags |= expr->ex_flags;
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(*expp)->ex_flags &= ~EX_PARENS;
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free_expression(expr);
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}
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