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| author | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-02-15 12:17:05 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-02-15 12:17:05 +0100 |
| commit | 3eb1eecf29e1e28982b297e565ee291be8636532 (patch) | |
| tree | eb1440321b077086e6d4ec1064117f8c5cbfc6d4 /gcc/match.pd | |
| parent | 8fa4bd81cb7cefa30212d79664963c1b6bbb9667 (diff) | |
| download | gcc-3eb1eecf29e1e28982b297e565ee291be8636532.zip gcc-3eb1eecf29e1e28982b297e565ee291be8636532.tar.gz gcc-3eb1eecf29e1e28982b297e565ee291be8636532.tar.bz2 | |
re PR tree-optimization/84334 (Stack overflow with -Ofast -frounding-math)
PR tree-optimization/84334
* match.pd ((A +- CST1) +- CST2 -> A + CST3): If A is
also a CONSTANT_CLASS_P, punt.
* gcc.dg/pr84334.c: New test.
From-SVN: r257683
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index f759711..4452b58 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -1733,9 +1733,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) CONSTANT_CLASS_P@2) /* If one of the types wraps, use that one. */ (if (!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_WRAPS (type)) - (if (outer_op == PLUS_EXPR) - (plus (view_convert @0) (inner_op @2 (view_convert @1))) - (minus (view_convert @0) (neg_inner_op @2 (view_convert @1)))) + /* If all 3 captures are CONSTANT_CLASS_P, punt, as we might recurse + forever if something doesn't simplify into a constant. */ + (if (!CONSTANT_CLASS_P (@0)) + (if (outer_op == PLUS_EXPR) + (plus (view_convert @0) (inner_op @2 (view_convert @1))) + (minus (view_convert @0) (neg_inner_op @2 (view_convert @1))))) (if (!ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0)) || TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))) (if (outer_op == PLUS_EXPR) |