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[Bug rtl-optimization/21485] [4.0/4.1/4.2 Regression] BYTEmark numsort: codegen regression with -O3
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Jan 2006 22:23:17 -0000
- Subject: [Bug rtl-optimization/21485] [4.0/4.1/4.2 Regression] BYTEmark numsort: codegen regression with -O3
- References: <bug-21485-10607@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from steven at gcc dot gnu dot org 2006-01-09 22:23 -------
AMD64 timings for today's GCC 4.1 (20060109) branch:
flags used score
for compilation (avg. of 3, higher is better)
-O3 685.2
-O3 -fprofile-generate 636
-O3 -fprofile-use 785.6
-O3 -fno-tree-pre 958.4
-O3 -fno-tree-pre -fprofile-generate 673.8
-O3 -fno-tree-pre -fprofile-use 964.2
-O3 -fno-tree-pre -fmove-loop-invariants 967.2
The problem really is that we present the register allocator with a harder
problem. Tough, there is really not much that can be done about this other
than crippling PRE for SMALL_REGISTER_CLASSES machines, but I don't know if we
should want to do that...
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21485