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From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/101188] [postreload] Uses content of a
 clobbered register
Date: Tue, 30 May 2023 19:05:28 +0000
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X-Bugzilla-Component: rtl-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101188

--- Comment #11 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Created attachment 55217
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55217&action=3Dedit
Proposed patch for postreload.cc to record clobbers of next insn + test cas=
e.

This patch solves the problem for avr and tests with no additional regressi=
ons
for avr.

--

rtl-optimization/101188: Don't bypass clobbers of some insns that are
optimized or are optimization candidates.

gcc/
        PR rtl-optimization/101188
        * postreload.cc (reload_cse_move2add): Record clobbers of next
        insn using move2add_note_store.

gcc/testsuite/
        PR rtl-optimization/101188
        * gcc.c-torture/execute/pr101188.c: New test.=