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| author | Bin Cheng <bin.cheng@arm.com> | 2015-06-26 11:12:20 +0000 |
|---|---|---|
| committer | Bin Cheng <amker@gcc.gnu.org> | 2015-06-26 11:12:20 +0000 |
| commit | 8710e30220d182f6ab4fe6058360fd726c153990 (patch) | |
| tree | 85126074539f49aa76d0d55c27a49412608d7f2e /gcc/tree-ssa-loop-niter.c | |
| parent | 66e1cacf608045c09f7c1e4be9940caefeccd473 (diff) | |
| download | gcc-8710e30220d182f6ab4fe6058360fd726c153990.zip gcc-8710e30220d182f6ab4fe6058360fd726c153990.tar.gz gcc-8710e30220d182f6ab4fe6058360fd726c153990.tar.bz2 | |
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
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 855d32c..c5adb1c 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -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; |