https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116136
Bug ID: 116136
Summary: [15 Regression] ext-dce exposes latent subreg
simplification bug on m68k
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: law at gcc dot gnu.org
Target Milestone: ---
ext-dce is exposing a latent bug in SUBREG simplification.
Recent changes in ext-dce are exhibiting regressions in the testsuite:
Tests that now fail, but worked before (3 tests):
gcc: gcc.c-torture/execute/960416-1.c -O2 execution test
gcc: gcc.c-torture/execute/960416-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
gcc: gcc.c-torture/execute/960416-1.c -Os execution test
Short thread on the underlying issue:
https://gcc.gnu.org/pipermail/gcc-patches/2024-July/658302.html
A patch to fix this previously latent bug is undergoing testing.
