https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123089
Bug ID: 123089
Summary: [x86] Excessive run time with -march=znver3
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Created attachment 63033
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63033&action=edit
C source code
For the attached code with recent gcc trunk:
foundBugs $ ../results/bin/gcc bug1158.c -w -o bug1158.exe
foundBugs $ (ulimit -t 10; ./bug1158.exe)
checksum = 34099839
foundBugs $ ../results/bin/gcc -O2 bug1158.c -w -o bug1158.exe
foundBugs $ (ulimit -t 10; ./bug1158.exe)
checksum = 34099839
foundBugs $ ../results/bin/gcc -O3 bug1158.c -w -o bug1158.exe
foundBugs $ (ulimit -t 10; ./bug1158.exe)
checksum = 34099839
foundBugs $ ../results/bin/gcc -O3 -fno-strict-aliasing bug1158.c -w -o
bug1158.exe
foundBugs $ (ulimit -t 10; ./bug1158.exe)
checksum = 34099839
foundBugs $ ../results/bin/gcc -O3 -fno-strict-aliasing -march=znver3
bug1158.c -w -o bug1158.exe
foundBugs $ (ulimit -t 10; ./bug1158.exe)
Killed
foundBugs $
For compiler
foundBugs $ ../results/bin/gcc -v
Using built-in specs.
COLLECT_GCC=../results/bin/gcc
COLLECT_LTO_WRAPPER=/home/dcb42/gcc/results.20251209.asan.ubsan/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../trunk/configure
--prefix=/home/dcb42/gcc/results.20251209.asan.ubsan --disable-bootstrap
--disable-doc --disable-multilib --with-build-config='bootstrap-asan
bootstrap-ubsan' --with-pkgversion=1dd44ebd5facfc96 --with-isl
--enable-checking=df,extra,fold,rtl,yes --enable-languages=c,c++,fortran
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20251209 (experimental) (1dd44ebd5facfc96)
foundBugs $
The bug first seems to occur sometime between g:55049da531f52464
and g:6ae7f781322d2813
