http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57736
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> --- Oops, submitted too soon. echo 'f(){__builtin_ia32_rdtsc();}' | gcc -xc - -S -o- <stdin>: In function âfâ: <stdin>:1:25: internal compiler error: in emit_move_insn, at expr.c:3486 0x6d9c63 emit_move_insn(rtx_def*, rtx_def*) gcc/expr.c:3485 0xb8063c ix86_expand_builtin gcc/config/i386/i386.c:31916 0x5ef5ec expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int) gcc/builtins.c:5807 0x6d420e expand_expr_real_1(tree_node*, rtx_def*, machine_mode, expand_modifier, rtx_def**) gcc/expr.c:10207 0x60e5ab expand_call_stmt gcc/cfgexpand.c:2119 0x60e5ab expand_gimple_stmt_1 gcc/cfgexpand.c:2157 0x60e5ab expand_gimple_stmt gcc/cfgexpand.c:2309 0x60f3b3 expand_gimple_basic_block gcc/cfgexpand.c:4143 0x610f84 gimple_expand_cfg gcc/cfgexpand.c:4662