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Roman Gareev bd5c6039c6 Align newly created arrays to the first level cache line boundary 
Aligning data to cache lines boundaries helps to avoid overheads related to
an access to it ([1]). This patch aligns newly created arrays and adds an
option to specify the first level cache line size. By default we use 64 bytes,
which is a typical cache-line size ([2]).

In case of Intel Core i7-3820 SandyBridge and the following options,

clang -O3 gemm.c -I utilities/ utilities/polybench.c -DPOLYBENCH_TIME
-march=native -mllvm -polly -mllvm -polly-pattern-matching-based-opts=true
-DPOLYBENCH_USE_SCALAR_LB -mllvm -polly-target-cache-level-associativity=8,8
-mllvm -polly-target-cache-level-sizes=32768,262144 -mllvm
-polly-target-latency-vector-fma=8

it helps to improve the performance from 11.303 GFlops/sec (39,247% of
theoretical peak) to 12.63 GFlops/sec (43,8542% of theoretical peak).

Refs.:

[1] - http://www.alexonlinux.com/aligned-vs-unaligned-memory-access
[2] - http://igoro.com/archive/gallery-of-processor-cache-effects/

Differential Revision: https://reviews.llvm.org/D28020

Reviewed-by: Tobias Grosser <tobias@grosser.es>
llvm-svn: 290253
 		2016-12-21 12:37:36 +00:00
clang Rename several methods on ASTRecordReader to follow LLVM style (lowerCamelCase). 2016-12-21 04:34:52 +00:00
clang-tools-extra Comment out char16_t and char32_t tests 2016-12-20 22:57:21 +00:00
compiler-rt Reduce the size of quarantine cache in ASAN_LOW_MEMORY configuration. 2016-12-21 00:18:10 +00:00
debuginfo-tests New round of fixes for "Always compile debuginfo-tests for the host triple" 2014-10-18 23:47:59 +00:00
libclc Fix build since r286752. 2016-11-14 16:06:33 +00:00
libcxx [CMake] Fix issue reported on sanitizer bots 2016-12-17 21:28:24 +00:00
libcxxabi [libc++abi] Mark failing test on Darwin as XFAIL 2016-12-13 02:43:04 +00:00
libunwind EHABI: mark some functions as exported 2016-11-17 23:53:35 +00:00
lld [ELF/tests] Use cpio -it instead of cpio -t. 2016-12-21 12:22:19 +00:00
lldb Ignore SIGPIPE in the mini-driver used by these tests. 2016-12-21 00:12:54 +00:00
llgo [llgo] Remove support for LLVM attributes 2016-12-06 19:22:04 +00:00
llvm Added a template for building target specific memory node in DAG. 2016-12-21 10:43:36 +00:00
openmp Reverting last change. 2016-12-21 09:04:08 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly Align newly created arrays to the first level cache line boundary 2016-12-21 12:37:36 +00:00