From 24938ce920406ea9ca0aafc4a1886b0251a88998 Mon Sep 17 00:00:00 2001 From: Zdenek Dvorak Date: Thu, 23 Aug 2007 01:05:05 +0200 Subject: re PR tree-optimization/32949 (suboptimal address generation for int indices on 64-bit targets) 2007-08-22 Zdenek Dvorak PR tree-optimization/32949 * tree-ssa-loop-niter.c (scev_probably_wraps_p): Test nowrap_type_p before failing for ivs with non-constant step. From-SVN: r127720 --- gcc/tree-ssa-loop-niter.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'gcc/tree-ssa-loop-niter.c') diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 6d1834ec5e4..40e7051c265 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 (); -- cgit v1.2.1