Bug 78402 - SciMark v2.0 Dense LU Matrix Factorization test runs more than 2 times slower under GCC 6.2 than under Clang 3.9
Summary: SciMark v2.0 Dense LU Matrix Factorization test runs more than 2 times slowe...
Status: RESOLVED INVALID
Alias: None
Product: gcc
Classification: Unclassified
Component: middle-end (show other bugs)
Version: 6.2.0
: P3 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
URL:
Keywords:
Depends on: 69564
Blocks: 79703
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Reported: 2016-11-17 16:49 UTC by Artem S. Tashkinov
Modified: 2017-07-26 07:26 UTC (History)
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Description Artem S. Tashkinov 2016-11-17 16:49:49 UTC 
As per http://www.phoronix.com/scan.php?page=article&item=gcc-clang-kblclear&num=2

GCC 6.2.0 - 1834
Clang 3.9.0 - 4165

g++ options: -O3 -march=native

CPU: Kaby Lake 7200U (the same CPU core as Sandy Bridge)
Comment 1 Uroš Bizjak 2017-07-26 07:26:22 UTC 
Phoronix Scimark 2.0 tests were faulty [1].

[1] https://kristerw.blogspot.si/2017/07/phoronix-scimark-benchmarking-results.html