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[Bug target/70734] __builtin_add_overflow emits poor code on x86-64
- From: "glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 20 Apr 2016 10:22:48 +0000
- Subject: [Bug target/70734] __builtin_add_overflow emits poor code on x86-64
- Auto-submitted: auto-generated
- References: <bug-70734-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70734
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #1)
> movl %edi, (%rdx)
Looks like we fail to notice that the result of the addition is unused and keep
this dead store...