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[Bug tree-optimization/41881] [4.5/4.6 regression] Complete unrolling (inner) versus vectorization of reduction
- From: "drow at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 Aug 2010 16:01:53 -0000
- Subject: [Bug tree-optimization/41881] [4.5/4.6 regression] Complete unrolling (inner) versus vectorization of reduction
- References: <bug-41881-3264@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from drow at gcc dot gnu dot org 2010-08-10 16:01 -------
Verified on x86_64 using:
gcc-4.3 -O3 -o 43.s -S reduc.c -ftree-vectorizer-verbose=1
[two loops vectorized]
gcc-4.4 -O3 -o 43.s -S reduc.c -ftree-vectorizer-verbose=1
[one loop vectorized]
--
drow at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |irar at gcc dot gnu dot org
Known to fail| |4.4.4
Known to work| |4.3.5
Summary|Complete unrolling (inner) |[4.5/4.6 regression]
|versus vectorization of |Complete unrolling (inner)
|reduction |versus vectorization of
| |reduction
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41881