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| author | Richard Guenther <rguenther@suse.de> | 2006-10-23 07:15:45 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2006-10-23 07:15:45 +0000 |
| commit | 4f76e46b189899f58e018dec68d7f5e68a6e55a2 (patch) | |
| tree | 7d9beeeaa99bee3c5a1fbb22e70da00ea720cc71 /gcc/convert.c | |
| parent | 1b406eadf9697727eb412f11ecae8d691e54a562 (diff) | |
| download | gcc-4f76e46b189899f58e018dec68d7f5e68a6e55a2.tar.gz | |
re PR middle-end/21032 (With -frounding-math, incorrectly reorders unary minus)
2006-10-23 Richard Guenther <rguenther@suse.de>
PR middle-end/21032
* convert.c (convert_to_real): Fold (float)-x to -(float)x
only if not flag_rounding_math.
* gcc.dg/pr21032.c: New testcase.
From-SVN: r117968
Diffstat (limited to 'gcc/convert.c')
| -rw-r--r-- | gcc/convert.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/convert.c b/gcc/convert.c index 118889fad44..0a9743ac8f8 100644 --- a/gcc/convert.c +++ b/gcc/convert.c @@ -248,10 +248,12 @@ convert_to_real (tree type, tree expr) if (itype != type && FLOAT_TYPE_P (type)) switch (TREE_CODE (expr)) { - /* Convert (float)-x into -(float)x. This is always safe. */ + /* Convert (float)-x into -(float)x. This is safe for + round-to-nearest rounding mode. */ case ABS_EXPR: case NEGATE_EXPR: - if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) + if (!flag_rounding_math + && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) return build1 (TREE_CODE (expr), type, fold (convert_to_real (type, TREE_OPERAND (expr, 0)))); |