https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94130
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |marxin at gcc dot gnu.org
--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
commit r10-7140-g349ab34dc64a10fe0b1eda66d13b62862878b73e
Author: Jakub Jelinek <ja...@redhat.com>
Date: Thu Mar 12 09:34:00 2020 +0100
tree-dse: Fix mem* head trimming if call has lhs [PR94130]
As the testcase shows, if DSE decides to head trim
{mem{set,cpy,move},strncpy}
and the call has lhs, it is incorrect to leave the lhs as is, because it
will then point to the adjusted address (base + head_trim) instead of the
original base.
The following patch fixes that by dropping the lhs of the call and
assigning
lhs the original base in a following statement.
2020-03-12 Jakub Jelinek <ja...@redhat.com>
PR tree-optimization/94130
* tree-ssa-dse.c: Include gimplify.h.
(increment_start_addr): If stmt has lhs, drop the lhs from call and
set it after the call to the original value of the first argument.
Formatting fixes.
(decrement_count): Formatting fix.
* gcc.c-torture/execute/pr94130.c: New test.
