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Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 6d1834e..40e7051 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -2969,8 +2969,7 @@ scev_probably_wraps_p (tree base, tree step, 2032, 2040, 0, 8, ..., but the code is still legal. */ if (chrec_contains_undetermined (base) - || chrec_contains_undetermined (step) - || TREE_CODE (step) != INTEGER_CST) + || chrec_contains_undetermined (step)) return true; if (integer_zerop (step)) @@ -2981,6 +2980,11 @@ scev_probably_wraps_p (tree base, tree step, if (use_overflow_semantics && nowrap_type_p (type)) return false; + /* To be able to use estimates on number of iterations of the loop, + we must have an upper bound on the absolute value of the step. */ + if (TREE_CODE (step) != INTEGER_CST) + return true; + /* Don't issue signed overflow warnings. */ fold_defer_overflow_warnings (); |