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| author | Richard Guenther <rguenther@suse.de> | 2009-06-29 11:57:15 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-06-29 11:57:15 +0000 |
| commit | 09a782ebdacc6a5227ed464d47eb3cc27e252c6a (patch) | |
| tree | 50e923e8964fbc46128696b82c92d91fa0a41a33 /gcc/tree-vrp.c | |
| parent | 152413f7edcf11d34026246569f5145d414f1653 (diff) | |
| download | gcc-09a782ebdacc6a5227ed464d47eb3cc27e252c6a.zip gcc-09a782ebdacc6a5227ed464d47eb3cc27e252c6a.tar.gz gcc-09a782ebdacc6a5227ed464d47eb3cc27e252c6a.tar.bz2 | |
re PR tree-optimization/40579 (gcc -O2 optimization causes infinite loop and wrong output)
2009-06-29 Richard Guenther <rguenther@suse.de>
PR tree-optimization/40579
* tree-vrp.c (vrp_evaluate_conditional): Bail out early if
the IL to simplify has constants that overflowed.
* gcc.c-torture/execute/pr40579.c: New testcase.
From-SVN: r149046
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 41a1beb..13ed4c0 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -5679,6 +5679,14 @@ vrp_evaluate_conditional (enum tree_code code, tree op0, tree op1, gimple stmt) tree ret; bool only_ranges; + /* Some passes and foldings leak constants with overflow flag set + into the IL. Avoid doing wrong things with these and bail out. */ + if ((TREE_CODE (op0) == INTEGER_CST + && TREE_OVERFLOW (op0)) + || (TREE_CODE (op1) == INTEGER_CST + && TREE_OVERFLOW (op1))) + return NULL_TREE; + sop = false; ret = vrp_evaluate_conditional_warnv_with_ops (code, op0, op1, true, &sop, &only_ranges); |