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[Bug tree-optimization/24653] [4.1 regression] EON regressed seriously on x86-64
- From: "hubicka at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Nov 2005 12:58:16 -0000
- Subject: [Bug tree-optimization/24653] [4.1 regression] EON regressed seriously on x86-64
- References: <bug-24653-176@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from hubicka at gcc dot gnu dot org 2005-11-03 12:58 -------
OK, have new, 100% sure theory ;)
for 4.0 -fno-tree-sra makes important difference, for 4.1 it does not. One
difference is that 4.0 splits startingpoint:
Initial instantiation for startPoint
startPoint.e[2] -> startPoint$e$2
startPoint.e[1] -> startPoint$e$1
startPoint.e[0] -> startPoint$e$0
4.1 claims:
Cannot scalarize variable startPoint because it must live in memory
so this looks like 4.1 is missing transformation here.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24653