https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105349
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> --- I actually had tested that: $ make check-gcc-c RUNTESTFLAGS="--target_board=unix'{-m64,-m32,-m32/-mpowerpc64}{-mcpu=power7,-mcpu=power8,-mcpu=power9,-mcpu=power10}' powerpc.exp=bswap-br*" === gcc Summary === # of expected passes 17 # of expected failures 1 # of unsupported tests 29 This is on powerpc64-linux. So what is different on your build, and what is that output change?