http://llvm.org/bugs/show_bug.cgi?id=22589
Bug ID: 22589
Summary: 22% performance degradation in SciMark2's Sparse
matmult benchmark
Product: clang
Version: 3.6
Hardware: Macintosh
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
There is a serious 22% performance degradation in the code generated for the
Sparse matmult benchmark of SciMark2 in the 3.6 release branch clang compiler
as well as the current svn trunk clang compiler.
Building the sources from http://math.nist.gov/scimark2/scimark2_1c.zip with...
make CFLAGS="-O3 -march=native"
on x86_64-apple-darwin14 reveals timings of...
998.439+/-0.482 for the clang 3.5.1 release compilers
1217.363+/-1.1004 for the clang 3.6 release branch compilers
This problem not to exist in current llvm/clang svn trunk.
989.315+/-0.686
I'll try to do a inverse-regression hunt in current trunk and see at what
recent commit the performance regression in the Sparse matmult benchmark
disappeared.
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