http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58139
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> --- You can try this: diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a8d70bc..ab4dc6c 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -34466,7 +34466,7 @@ ix86_hard_regno_mode_ok (int regno, enum machine_mode mode) /* OImode move is available only when AVX is enabled. */ return ((TARGET_AVX && mode == OImode) - || VALID_AVX256_REG_MODE (mode) + || (TARGET_AVX && VALID_AVX256_REG_MODE (mode)) || VALID_SSE_REG_MODE (mode) || VALID_SSE2_REG_MODE (mode) || VALID_MMX_REG_MODE (mode)