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[Bug rtl-optimization/58195] Missed optimization opportunity when returning a conditional
- From: "bisqwit at iki dot fi" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 11 Mar 2014 13:28:10 +0000
- Subject: [Bug rtl-optimization/58195] Missed optimization opportunity when returning a conditional
- Auto-submitted: auto-generated
- References: <bug-58195-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58195
Joel Yliluoma <bisqwit at iki dot fi> changed:
What |Removed |Added
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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.