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[Bug rtl-optimization/84071] [7/8 regression] wrong elimination of zero-extension after sign-extended load
- From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 31 Jan 2018 10:03:38 +0000
- Subject: [Bug rtl-optimization/84071] [7/8 regression] wrong elimination of zero-extension after sign-extended load
- Auto-submitted: auto-generated
- References: <bug-84071-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84071
--- Comment #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Wed Jan 31 10:03:06 2018
New Revision: 257224
URL: https://gcc.gnu.org/viewcvs?rev=257224&root=gcc&view=rev
Log:
PR rtl-optimization/84071
* combine.c (record_dead_and_set_regs_1): Record the source unmodified
for a paradoxical SUBREG on a WORD_REGISTER_OPERATIONS target.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/20180131-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c
trunk/gcc/testsuite/ChangeLog