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[qfcc] Implement mod for v6 progs

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The tricky bit was figuring out how to get `floor()` out of the
available instructions. It's handy that the comparison ops always
returned floats and didn't force the use of branches.
This commit is contained in:
Bill Currie 2024-11-26 14:38:55 +09:00
parent 7b4aa1efd8
commit 2bd9d26cc1
1 changed files with 9 additions and 0 deletions
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9
tools/qfcc/source/expr_binary.c
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@ -1208,6 +1208,15 @@ reimplement_binary_expr (int op, const expr_t *e1, const expr_t *e2)
return binary_expr ('-', e1, binary_expr ('*', e2, trn));
}
break;
case QC_MOD:
{
auto div = paren_expr (binary_expr ('/', e1, e2));
auto trn = binary_expr ('&', div, div);
auto one = binary_expr (QC_GT, trn, div);
auto flr = binary_expr ('-', trn, one);
return binary_expr ('-', e1, binary_expr ('*', e2, flr));
}
break;
}
}
return nullptr;