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| author | amker <amker@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-06-26 11:12:20 +0000 |
|---|---|---|
| committer | Than McIntosh <thanm@google.com> | 2015-12-16 15:08:13 -0500 |
| commit | 1c9f0db349a553014d418dcda594b09e386b9b0c (patch) | |
| tree | 95792fa1f4c558381f5f371dca7acc4c57f930e6 | |
| parent | f8e25f42573503b96db7074cf16ee52064a6da35 (diff) | |
| download | toolchain_gcc-1c9f0db349a553014d418dcda594b09e386b9b0c.tar.gz toolchain_gcc-1c9f0db349a553014d418dcda594b09e386b9b0c.tar.bz2 toolchain_gcc-1c9f0db349a553014d418dcda594b09e386b9b0c.zip | |
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 <thanm@google.com>
| -rw-r--r-- | gcc-4.9/gcc/tree-ssa-loop-niter.c | 16 |
1 files changed, 15 insertions, 1 deletions
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; |