https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79947
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> --- There's reduced test-case: ******** /tmp/ppc-ice.c ******** float a, b; void c () { a = __builtin_sqrtf (b); } $ ppc64-linux-gnu-gcc -Ofast -mno-powerpc-gfxopt -mcmpb -c ppc-ice.c --verbose Using built-in specs. COLLECT_GCC=ppc64-linux-gnu-gcc Target: ppc64-linux-gnu Configured with: ./../configure --enable-linker-build-id --prefix=/home/marxin/BIG/buildbot/slave/gcc-master-build-ppc64/../install/gcc-6fe883d64cf228785f3d0a4e24f9138c8958c93b --target=ppc64-linux-gnu --with-as=/usr/bin/powerpc64-suse-linux-as --disable-bootstrap ... /home/marxin/BIG/buildbot/slave/install/gcc-6fe883d64cf228785f3d0a4e24f9138c8958c93b/bin/../lib/gcc/ppc64-linux-gnu/7.0.1/cc1 -quiet -v -iprefix /home/marxin/BIG/buildbot/slave/install/gcc-6fe883d64cf228785f3d0a4e24f9138c8958c93b/bin/../lib64/gcc/ppc64-linux-gnu/7.0.1/ -D__unix__ -D__gnu_linux__ -D__linux__ -Dunix -D__unix -Dlinux -D__linux -Asystem=linux -Asystem=unix -Asystem=posix ppc-ice.c -quiet -dumpbase ppc-ice.c -mno-powerpc-gfxopt -mcmpb -auxbase ppc-ice -Ofast -version -o /tmp/ccSq65JO.s Hope you'll reproduce it now.