http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48084
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-03-12 02:23:35 UTC --- Another one: [hjl@gnu-6 ilp32-31]$ cat m.i void _mm_monitor (void const * __P, unsigned int __E, unsigned int __H) { __builtin_ia32_monitor (__P, __E, __H); } [hjl@gnu-6 ilp32-31]$ /export/build/gnu/gcc-x32/build-x86_64-linux/gcc/xgcc -B/export/build/gnu/gcc-x32/build-x86_64-linux/gcc/ -S -mx32 -O2 -msse3 m.i m.i: In function ‘_mm_monitor’: m.i:4:27: internal compiler error: in copy_to_mode_reg, at explow.c:630 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. [hjl@gnu-6 ilp32-31]$