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[Bug bootstrap/52391] [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 27 Feb 2012 23:16:09 +0000
- Subject: [Bug bootstrap/52391] [4.7 regression] genattrtab almost 5X slower for m68k than in 4.6 and earlier releases
- Auto-submitted: auto-generated
- References: <bug-52391-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52391
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-27 23:16:09 UTC ---
Yeah, before that the huge conditions wouldn't be optimized, because the
SYMBOL_REFs in them wouldn't rtx_equal_p even when they had the same strings.
The question is if the test optimization can be improved, but in any case this
doesn't look like a very important regression, it is much more important how
fast is the insn-attrtab.c code than how long it takes to generate it. The
former is used for all compilations, the latter only once (or 3 times for
bootstrap) during gcc build.