https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120660
Bug ID: 120660
Summary: [16 Regression] wrong code with -O
-favoid-store-forwarding
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: armv7a-hardfloat-linux-gnueabi
Created attachment 61643
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61643&action=edit
reduced testcase
Compiler output:
$ armv7a-hardfloat-linux-gnueabi-gcc -O -favoid-store-forwarding testcase.c
-static
$ qemu-arm -- ./a.out
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted
$ armv7a-hardfloat-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-armv7a-hardfloat//bin/armv7a-hardfloat-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20250615095650-r16-1515-gafe3401f2e73e2-checking-yes-rtl-df-extra-armv7a-hardfloat/bin/../libexec/gcc/armv7a-hardfloat-linux-gnueabi/16.0.0/lto-wrapper
Target: armv7a-hardfloat-linux-gnueabi
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--enable-libsanitizer --with-float=hard --with-fpu=vfpv4 --with-arch=armv7-a
--with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=armv7a-hardfloat-linux-gnueabi
--with-ld=/usr/bin/armv7a-hardfloat-linux-gnueabi-ld
--with-as=/usr/bin/armv7a-hardfloat-linux-gnueabi-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20250615095650-r16-1515-gafe3401f2e73e2-checking-yes-rtl-df-extra-armv7a-hardfloat
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250615 (experimental) (GCC)
