https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89794
Bug ID: 89794 Summary: wrong code with -Og -fno-forward-propagate 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 46010 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46010&action=edit reduced testcase Output: $ armv7a-hardfloat-linux-gnueabi-gcc -Og -fno-forward-propagate testcase.c -static $ ./a.out qemu: uncaught target signal 11 (Segmentation fault) - core dumped Segmentation fault The instruction: ... @ testcase.c:12: __builtin_memset (&i, c, 2); movw r1, #:lower16:c @ tmp132, movt r1, #:upper16:c @ tmp132, ldr ip, [r1] @ c.2_7, c uxtb r3, ip @ c.2_7, c.2_7 add r3, r3, r3, lsl #8 @ tmp140, c.2_7, c.2_7, strh r3, [sp] @ movhi @ tmp140, MEM[(void *)&i] overwrites return address $ 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)