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[qfcc] Handle cancellations in large chains

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It turned out I wasn't shuffling canceled terms correctly, thus far too
many hours of bug hunting.
This commit is contained in:
Bill Currie 2023-09-29 21:53:56 +09:00
parent 35ec9062cf
commit 3f40977ecb
1 changed files with 1 additions and 4 deletions
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5
tools/qfcc/source/expr_algebra.c
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@ -590,6 +590,7 @@ sum_expr (type_t *type, const expr_t *a, const expr_t *b)
break; break;
} }
} }
dstsub = srcsub;
if (*srcsub++) { if (*srcsub++) {
// found a-a // found a-a
while (*srcsub) { while (*srcsub) {
@ -621,9 +622,6 @@ component_sum (int op, const expr_t **c, const expr_t **a, const expr_t **b,
} else { } else {
c[i] = sum_expr (sum_type, a[i], neg_expr (b[i])); c[i] = sum_expr (sum_type, a[i], neg_expr (b[i]));
} }
if (c[i]) {
c[i] = fold_constants (c[i]);
}
} else if (a[i]) { } else if (a[i]) {
c[i] = a[i]; c[i] = a[i];
} else if (b[i]) { } else if (b[i]) {
@ -631,7 +629,6 @@ component_sum (int op, const expr_t **c, const expr_t **a, const expr_t **b,
c[i] = b[i]; c[i] = b[i];
} else { } else {
c[i] = neg_expr (b[i]); c[i] = neg_expr (b[i]);
c[i] = fold_constants (c[i]);
} }
} else { } else {
c[i] = 0; c[i] = 0;