New submission from Ma Lin <malin...@163.com>:
On windows, it seems 32bit builds (3.7.2/3.8.0a2) don't using SSE2 sufficiently.
I test on 3.8 branch, python38.dll only uses XMM register 28 times. The
official build is the same.
After enable this option, python38.dll uses XMM register 11,704 times.
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -88,6 +88,7 @@
<AdditionalIncludeDirectories
Condition="$(IncludeExternals)">$(zlibDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>_USRDLL;Py_BUILD_CORE;Py_ENABLE_SHARED;MS_DLL_ID="$(SysWinVer)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions
Condition="$(IncludeExternals)">_Py_HAVE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+ <EnableEnhancedInstructionSet
Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
</ClCompile>
<Link>
<AdditionalDependencies>version.lib;shlwapi.lib;ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
x86 instruction set has only a few number of registers.
In my understanding, using XMM registers on 32bit build will brings a small
speed up.
I'm not an expert of this kind knowledge, sorry if I'm wrong.
----------
components: Build, Windows
messages: 338317
nosy: Ma Lin, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Build 32bit Python on Windows with SSE2 instruction set
versions: Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36357>
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