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[Bug libfortran/51119] New: MATMUL slow for large matrices
- From: "jb at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 14 Nov 2011 06:48:35 +0000
- Subject: [Bug libfortran/51119] New: MATMUL slow for large matrices
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51119
Bug #: 51119
Summary: MATMUL slow for large matrices
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: libfortran
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jb@gcc.gnu.org
Compared to ATLAS BLAS on an AMD 10h processor, MATMUL on square matrices with
n > 256 is around a factor of 8 slower.
While I don't think it's worth spending the time on target-specific parameters
and/or asm-coded inner kernel as high-performance BLAS implementations do, I
suspect that a little effort towards cache blocking could improve things.