Mercurial > projects > ldc
changeset 421:1c65b5477eaa
Fix real comparison for real: allow +0 to be distinguished from -0.
| author | Christian Kamm <kamm incasoftware de> |
|---|---|
| date | Mon, 28 Jul 2008 21:37:47 +0200 |
| parents | 491264b7cb93 |
| children | fa91b03d9cd7 |
| files | dmd/expression.c |
| diffstat | 1 files changed, 6 insertions(+), 5 deletions(-) [+] |
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--- a/dmd/expression.c Mon Jul 28 20:50:41 2008 +0200 +++ b/dmd/expression.c Mon Jul 28 21:37:47 2008 +0200 @@ -1494,11 +1494,12 @@ int RealEquals(real_t x1, real_t x2) { - return (isnan(x1) && isnan(x2)) || - /* In some cases, the REALPAD bytes get garbage in them, - * so be sure and ignore them. - */ - x1 == x2; + return // special case nans + (isnan(x1) && isnan(x2)) || + // and zero, in order to distinguish +0 from -0 + (x1 == 0 && x2 == 0 && 1./x1 == 1./x2) || + // otherwise just compare + (x1 != 0. && x1 == x2); } int RealExp::equals(Object *o)