https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89795
Bug ID: 89795 Summary: wrong code with -O2 -fno-dce -fno-forward-propagate -fno-sched-pressure Product: gcc Version: 9.0 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 46011 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46011&action=edit reduced testcase Compiler output: $ armv7a-hardfloat-linux-gnueabi-gcc -O2 -fno-dce -fno-forward-propagate -fno-sched-pressure testcase.c -static $ ./a.out qemu: uncaught target signal 6 (Aborted) - core dumped Aborted Correct value is 0xf7, invalid value is 0xfffffff7 (sign extended). $ 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-269795-checking-yes-rtl-df-extra-armv7a-hardfloat/bin/../libexec/gcc/armv7a-hardfloat-linux-gnueabi/9.0.1/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 --with-cloog --with-ppl --with-isl --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-269795-checking-yes-rtl-df-extra-armv7a-hardfloat Thread model: posix gcc version 9.0.1 20190319 (experimental) (GCC)