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re PR bootstrap/66638 (profiledbootstrap failure on x86-64 with LTO) 

PR bootstrap/66638
	* tree-ssa-loop-niter.c (loop_exits_before_overflow): Skip if
	assertion failed.  Remove assertion itself.

From-SVN: r225008
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Bin Cheng 2015-06-26 11:12:20 +00:00 committed by Bin Cheng
parent 66e1cacf60
commit 8710e30220
2 changed files with 21 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-06-26 Bin Cheng <bin.cheng@arm.com>
PR bootstrap/66638
* tree-ssa-loop-niter.c (loop_exits_before_overflow): Skip if
assertion failed. Remove assertion itself.
2015-06-26 Richard Biener <rguenther@suse.de>
* fold-const.c (fold_binary_loc): Remove -A CMP -B -> A CMP B

16
gcc/tree-ssa-loop-niter.c
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@ -3955,7 +3955,21 @@ 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;