github_mirrors/vectorscan
3
0
Fork 1
mirror of https://github.com/VectorCamp/vectorscan.git synced 2025-06-28 16:41:01 +03:00
Code Issues Packages Projects Releases Wiki Activity

Clear upper half of AVX register before libm call

Browse Source 
Clearing the upper half of the AVX register is required before calling SSE
code to avoid AVX-to-SSE transition penalties.
This commit is contained in:
Matthew Barr 2017-02-10 11:29:42 +11:00
parent 1245156f44
commit 9363ae7486
3 changed files with 76 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
CMakeLists.txt
View File

@ -991,6 +991,7 @@ SET (hs_SRCS
src/util/fatbit_build.h
src/util/graph.h
src/util/hash.h
src/util/math.h
src/util/multibit_build.cpp
src/util/multibit_build.h
src/util/order_check.h

3
src/fdr/fdr_compile.cpp
View File

@ -43,6 +43,7 @@
#include "util/alloc.h"
#include "util/compare.h"
#include "util/dump_mask.h"
#include "util/math.h"
#include "util/target_info.h"
#include "util/ue2string.h"
#include "util/verify_types.h"
@ -195,7 +196,7 @@ aligned_unique_ptr<FDR> FDRCompiler::setupFDR() {
static
double getScoreUtil(u32 len, u32 count) {
return len == 0 ? numeric_limits<double>::max()
: pow(count, 1.05) * pow(len, -3.0);
: our_pow(count, 1.05) * our_pow(len, -3.0);
}
/**

73
src/util/math.h Normal file
View File

@ -0,0 +1,73 @@
/*
* Copyright (c) 2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef UTIL_MATH_H_
#define UTIL_MATH_H_
#include <math.h>
#ifdef __cplusplus
# if defined(HAVE_CXX_X86INTRIN_H)
# define USE_X86INTRIN_H
# endif
#else // C
# if defined(HAVE_C_X86INTRIN_H)
# define USE_X86INTRIN_H
# endif
#endif
#ifdef __cplusplus
# if defined(HAVE_CXX_INTRIN_H)
# define USE_INTRIN_H
# endif
#else // C
# if defined(HAVE_C_INTRIN_H)
# define USE_INTRIN_H
# endif
#endif
#if defined(USE_X86INTRIN_H)
#include <x86intrin.h>
#elif defined(USE_INTRIN_H)
#include <intrin.h>
#endif
static really_inline
double our_pow(double x, double y) {
#if defined(__AVX__)
/*
* Clear the upper half of AVX registers before calling into the math lib.
* On some versions of glibc this can save thousands of AVX-to-SSE
* transitions.
*/
_mm256_zeroupper();
#endif
return pow(x, y);
}
#endif // UTIL_MATH_H_