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[Bug string/20736] powerpc: string2.h strcmp macro gratuitously adds __builtin_
- From: "acsawdey at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 27 Oct 2016 18:51:34 +0000
- Subject: [Bug string/20736] powerpc: string2.h strcmp macro gratuitously adds __builtin_
- Auto-submitted: auto-generated
- References: <firstname.lastname@example.org/bugzilla/>
--- Comment #5 from Aaron Sawdey <acsawdey at gcc dot gnu.org> ---
Yes this is specific to powerpc because I am adding gcc builtin expansion of
strncmp/strcmp. When I did the same thing for memcmp I was able to test the
builtin expansion vs the base case by turning it off with -fno-builtin-memcmp.
Ultimately it doesn't matter if this changes and it sounds like it won't. "The
code looks nicer" carries little weight vs performance numbers as you say.
The thing that I will want do do (but not via this BZ) is to get some of this
macro expansion trickery out of the way because gcc's expansion can generate a
whole lot better code especially when gcc knows the alignment of the string
pointers due to analysis. But this can be done via
_HAVE_STRING_ARCH_strcmp/strncmp in sysdeps/powerpc/bits/string.h.
I think this answers the question and this bug can be closed.
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