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Diffstat (limited to 'gcc/tree-ssa-loop-manip.c')
| -rw-r--r-- | gcc/tree-ssa-loop-manip.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/tree-ssa-loop-manip.c b/gcc/tree-ssa-loop-manip.c index 6b220e9d3e6..715c412c790 100644 --- a/gcc/tree-ssa-loop-manip.c +++ b/gcc/tree-ssa-loop-manip.c @@ -1,5 +1,5 @@ /* High-level loop manipulation functions. - Copyright (C) 2004, 2005 Free Software Foundation, Inc. + Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of GCC. @@ -86,7 +86,9 @@ create_iv (tree base, tree step, tree var, struct loop *loop, } else { - if (!tree_expr_nonnegative_p (step) + bool ovf; + + if (!tree_expr_nonnegative_warnv_p (step, &ovf) && may_negate_without_overflow_p (step)) { incr_op = MINUS_EXPR; |