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[Bug middle-end/39976] [4.5 Regression] Big sixtrack degradation on powerpc 32/64 after revision r146817
- From: "matz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 May 2009 14:37:14 -0000
- Subject: [Bug middle-end/39976] [4.5 Regression] Big sixtrack degradation on powerpc 32/64 after revision r146817
- References: <bug-39976-16550@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from matz at gcc dot gnu dot org 2009-05-04 14:37 -------
Compile options please. I can't reproduce it with a powerpc64 compiler
with -O2, neither with -m32 nor -m64, -ffast-math or no -ffast-math.
Also 'gcc -v' can't hurt to make sure our compilers are configured the same.
Hint: I use this command to quickly skim over the situation with labels and
bdnz:
% egrep '^.L|bdnz' thin6d.s
If the bdnz lines always mention the label from a line above it's a single
basic block loop.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39976