From 1c9f0db349a553014d418dcda594b09e386b9b0c Mon Sep 17 00:00:00 2001 From: amker Date: Fri, 26 Jun 2015 11:12:20 +0000 Subject: Cherrypick PR bootstrap/66638 bugfix from trunk. PR bootstrap/66638 * tree-ssa-loop-niter.c (loop_exits_before_overflow): Skip if assertion failed. Remove assertion itself. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225008 138bc75d-0d04-0410-961f-82ee72b054a4 Bug: 26224556 Change-Id: I2fa31bfe44978659a554a413c64d796b357338b5 Signed-off-by: Than McIntosh --- gcc-4.9/gcc/tree-ssa-loop-niter.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/gcc-4.9/gcc/tree-ssa-loop-niter.c b/gcc-4.9/gcc/tree-ssa-loop-niter.c index cb9214fbb..db069e06c 100644 --- a/gcc-4.9/gcc/tree-ssa-loop-niter.c +++ b/gcc-4.9/gcc/tree-ssa-loop-niter.c @@ -3950,7 +3950,21 @@ loop_exits_before_overflow (tree base, tree step, if (!CONVERT_EXPR_P (e) || !operand_equal_p (e, unsigned_base, 0)) continue; e = TREE_OPERAND (e, 0); - gcc_assert (operand_equal_p (e, base, 0)); + /* It may still be possible to prove no overflow even if condition + "operand_equal_p (e, base, 0)" isn't satisfied here, like below + example: + + e : ssa_var ; unsigned long type + base : (int) ssa_var + unsigned_base : (unsigned int) ssa_var + + Unfortunately this is a rare case observed during GCC profiled + bootstrap. See PR66638 for more information. + + For now, we just skip the possibility. */ + if (!operand_equal_p (e, base, 0)) + continue; + if (tree_int_cst_sign_bit (step)) { code = LT_EXPR; -- cgit v1.2.3