http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58195
Joel Yliluoma <bisqwit at iki dot fi> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bisqwit at iki dot fi --- Comment #1 from Joel Yliluoma <bisqwit at iki dot fi> --- Problem confirmed on "gcc (GCC) 4.9.0 20140303 (experimental)" (SVN version) in both 32-bit and 64-bit mode using -Ofast. For comparison, Clang++ produces this instead (even on -O1): negl %edi movl %edi, %eax ret GCC misses an optimization opportunity here.