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[Bug middle-end/70140] Inefficient expansion of __builtin_mempcpy
- From: "wilco at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 17 Jul 2017 16:19:08 +0000
- Subject: [Bug middle-end/70140] Inefficient expansion of __builtin_mempcpy
- Auto-submitted: auto-generated
- References: <bug-70140-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70140
--- Comment #7 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #6)
> Created attachment 41772 [details]
> Patch candidate
>
> I'm going to prepare some test-cases for that. Does it look good?
Yes, it now inlines small constant sizes. However large and variable sized
copies have the wrong return value:
void *f1(void *p, void *q) { return __builtin_mempcpy(p, q, 256); }
f1:
mov x2, 256
b memcpy