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Using SSE4.2 intrinsics in basic_parser if available

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fix #622
This commit is contained in:
octopus-prime
2017-07-08 15:48:51 +02:00
committed by Vinnie Falco
parent b1a8cf8a13
commit 288f363fa6
2 changed files with 16 additions and 28 deletions
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1
CHANGELOG.md
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@ -7,6 +7,7 @@ Version 75:
* Shrink serializer buffers using buffers_ref
* Add serializer::limit
* file_body tests
* Using SSE4.2 intrinsics in basic_parser if available
--------------------------------------------------------------------------------

43
include/beast/core/detail/cpu_info.hpp
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@ -8,11 +8,10 @@
#ifndef BEAST_DETAIL_CPU_INFO_HPP
#define BEAST_DETAIL_CPU_INFO_HPP
#include <boost/config.hpp>
#ifndef BEAST_NO_INTRINSICS
# if defined(_MSC_VER) || \
(defined(__i386__) && defined(__PIC__) && \
defined(__GNUC__) && ! defined(__clang__)) || \
defined(__i386__)
# if defined(BOOST_MSVC) || ((defined(BOOST_GCC) || defined(BOOST_CLANG)) && defined(__SSE4_2__))
# define BEAST_NO_INTRINSICS 0
# else
# define BEAST_NO_INTRINSICS 1
@ -21,8 +20,10 @@
#if ! BEAST_NO_INTRINSICS
#if defined(_MSC_VER)
#if defined(BOOST_MSVC)
#include <intrin.h> // __cpuid
#else
#include <cpuid.h> // __get_cpuid
#endif
namespace beast {
@ -40,34 +41,15 @@ cpuid(
std::uint32_t& ecx,
std::uint32_t& edx)
{
#if defined(_MSC_VER)
#if defined(BOOST_MSVC)
int regs[4];
__cpuid(regs, id);
eax = regs[0];
ebx = regs[1];
ecx = regs[2];
edx = regs[3];
#elif defined(__i386__) && defined(__PIC__) && \
defined(__GNUC__) && ! defined(__clang__)
// We have to backup ebx in 32 bit PIC code because it is reserved by the ABI
uint32_t ebx_backup;
__asm__ __volatile__
(
"movl %%ebx, %0\n\t"
"movl %1, %%ebx\n\t"
"cpuid\n\t"
"movl %%ebx, %1\n\t"
"movl %0, %%ebx\n\t"
: "=m" (ebx_backup), "+m"(ebx), "+a"(eax), "+c"(ecx), "+d"(edx)
);
#elif defined(__i386__)
__asm__("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(id) : "ebx");
#else
# error Unknown compiler!
__get_cpuid(id, &eax, &ebx, &ecx, &edx);
#endif
}
@ -82,13 +64,18 @@ inline
cpu_info::
cpu_info()
{
std::uint32_t eax, ebx, ecx, edx;
constexpr std::uint32_t SSE42 = 1 << 20;
std::uint32_t eax = 0;
std::uint32_t ebx = 0;
std::uint32_t ecx = 0;
std::uint32_t edx = 0;
cpuid(0, eax, ebx, ecx, edx);
if(eax >= 1)
{
cpuid(1, eax, ebx, ecx, edx);
sse42 = (ecx & (1 << 20)) != 0;
sse42 = (ecx & SSE42) != 0;
}
}