[Bug tree-optimization/96522] [9/10 Regression] Incorrect with with -O -fno-tree-pta
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96522 --- Comment #8 from CVS Commits --- The releases/gcc-10 branch has been updated by Richard Biener : https://gcc.gnu.org/g:1dbb919d0868319a5503b91049283a189ac1b4ac commit r10-8760-g1dbb919d0868319a5503b91049283a189ac1b4ac Author: Richard Biener Date: Thu Aug 27 11:48:15 2020 +0200 tree-optimization/96522 - transfer of flow-sensitive info in copy_ref_info This removes the bogus tranfer of flow-sensitive info in copy_ref_info plus fixes one oversight in FRE when flow-sensitive non-NULLness was added to points-to info. 2020-08-27 Richard Biener PR tree-optimization/96522 * tree-ssa-address.c (copy_ref_info): Reset flow-sensitive info of the copied points-to. Transfer bigger alignment via the access type. * tree-ssa-sccvn.c (eliminate_dom_walker::eliminate_stmt): Reset all flow-sensitive info. * gcc.dg/torture/pr96522.c: New testcase. (cherry picked from commit eb68d9d828f94d28afa5900fbf3072bbcd64ba8a)
[Bug tree-optimization/96522] [9/10 Regression] Incorrect with with -O -fno-tree-pta
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96522
--- Comment #7 from Richard Biener ---
(In reply to Richard Biener from comment #6)
> Hmm, picking the ref onto gcc-10 causes
>
> FAIL: gcc.dg/vect/pr81410.c execution test
>
> due to an unaligned access.
Looks like a latent issue. The following on an unpatched tree is enough
to provoke the FAIL (but ptr-info should not affect correctness).
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 9ace345fc5e..ea32b70a4f3 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -9565,10 +9567,12 @@ vectorizable_load (stmt_vec_info stmt_info,
gimple_stmt_iterator *gsi,
}
else
misalign = DR_MISALIGNMENT (first_dr_info);
+#if 0
if (dataref_offset == NULL_TREE
&& TREE_CODE (dataref_ptr) == SSA_NAME)
set_ptr_info_alignment (get_ptr_info (dataref_ptr),
align, misalign);
+#endif
if (final_mask)
{
[Bug tree-optimization/96522] [9/10 Regression] Incorrect with with -O -fno-tree-pta
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96522 --- Comment #6 from Richard Biener --- Hmm, picking the ref onto gcc-10 causes FAIL: gcc.dg/vect/pr81410.c execution test due to an unaligned access.
