From 32bd240907e86af72aac473508bd36349dcfd183 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Tue, 8 Mar 2011 11:43:10 +0100 Subject: re PR tree-optimization/48022 (-Wstrict-overflow warning on code that doesn't have overflows) PR tree-optimization/48022 * fold-const.c (fold_comparison): Don't call fold_overflow_warning for EQ/NE_EXPR. * gcc.dg/pr48022-1.c: New test. * gcc.dg/pr48022-2.c: New test. From-SVN: r170772 --- gcc/fold-const.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'gcc/fold-const.c') diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 07b59d8..957049c 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -1,6 +1,6 @@ /* Fold a constant sub-tree into a single node for C-compiler Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 + 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GCC. @@ -8572,10 +8572,11 @@ fold_comparison (location_t loc, enum tree_code code, tree type, && (TREE_CODE (lhs) != INTEGER_CST || !TREE_OVERFLOW (lhs))) { - fold_overflow_warning ("assuming signed overflow does not occur " - "when changing X +- C1 cmp C2 to " - "X cmp C1 +- C2", - WARN_STRICT_OVERFLOW_COMPARISON); + if (code != EQ_EXPR && code != NE_EXPR) + fold_overflow_warning ("assuming signed overflow does not occur " + "when changing X +- C1 cmp C2 to " + "X cmp C1 +- C2", + WARN_STRICT_OVERFLOW_COMPARISON); return fold_build2_loc (loc, code, type, variable, lhs); } } -- cgit v1.1