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[Bug target/52415] memcpy to local variable generates unnecessary stack frame for armv7
- From: "jay.foad at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 28 Feb 2012 13:03:50 +0000
- Subject: [Bug target/52415] memcpy to local variable generates unnecessary stack frame for armv7
- Auto-submitted: auto-generated
- References: <bug-52415-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52415
--- Comment #5 from Jay Foad <jay.foad at gmail dot com> 2012-02-28 13:03:50 UTC ---
> But to answer your question, how you can assert it is properly aligned, in gcc
> 4.7.0 you can write:
> __builtin_memcpy (&i, __builtin_assume_aligned (p, sizeof *p), sizeof i);
Thanks! Better:
__builtin_assume_aligned (p, __alignof__ *p)