mirror of https://git.tukaani.org/xz.git
liblzma: Create crc_clmul.c.
Both crc32_clmul() and crc64_clmul() are now exported from crc32_clmul.c as lzma_crc32_clmul() and lzma_crc64_clmul(). This ensures that is_clmul_supported() (now lzma_is_clmul_supported()) is not duplicated between crc32_fast.c and crc64_fast.c. Also, it encapsulates the complexity of the CLMUL implementations into a single file and reduces the complexity of crc32_fast.c and crc64_fast.c. Before, CLMUL code was present in crc32_fast.c, crc64_fast.c, and crc_common.h. During the conversion, various cleanups were applied to code (thanks to Lasse Collin) including: - Require using semicolons with MASK_/L/H/LH macros. - Variable typing and const handling improvements. - Improvements to comments. - Fixes to the pragmas used. - Removed unneeded variables. - Whitespace improvements. - Fixed CRC_USE_GENERIC_FOR_SMALL_INPUTS handling. - Silenced warnings and removed the need for some #pragmas
This commit is contained in:
Jia Tan
parent
a3ebc2c516
commit
8c0f9376f5
|
|
@ -845,7 +845,11 @@ if(HAVE_IMMINTRIN_H)
|
||||||
int main(void) { return 0; }
|
int main(void) { return 0; }
|
||||||
"
|
"
|
||||||
HAVE_USABLE_CLMUL)
|
HAVE_USABLE_CLMUL)
|
||||||
tuklib_add_definition_if(liblzma HAVE_USABLE_CLMUL)
|
|
||||||
|
if(HAVE_USABLE_CLMUL)
|
||||||
|
target_sources(liblzma PRIVATE src/liblzma/check/crc_clmul.c)
|
||||||
|
target_compile_definitions(liblzma PRIVATE HAVE_USABLE_CLMUL)
|
||||||
|
endif()
|
||||||
endif()
|
endif()
|
||||||
|
|
||||||
# Support -fvisiblity=hidden when building shared liblzma.
|
# Support -fvisiblity=hidden when building shared liblzma.
|
||||||
|
|
|
||||||
|
|
@ -1035,11 +1035,13 @@ __m128i my_clmul(__m128i a)
|
||||||
[Define to 1 if _mm_set_epi64x and
|
[Define to 1 if _mm_set_epi64x and
|
||||||
_mm_clmulepi64_si128 are usable.
|
_mm_clmulepi64_si128 are usable.
|
||||||
See configure.ac for details.])
|
See configure.ac for details.])
|
||||||
AC_MSG_RESULT([yes])
|
enable_clmul_crc=yes
|
||||||
], [
|
], [
|
||||||
AC_MSG_RESULT([no])
|
enable_clmul_crc=no
|
||||||
])
|
])
|
||||||
|
AC_MSG_RESULT([$enable_clmul_crc])
|
||||||
])
|
])
|
||||||
|
AM_CONDITIONAL([COND_CRC_CLMUL], [test "x$enable_clmul_crc" = xyes])
|
||||||
|
|
||||||
# Check for sandbox support. If one is found, set enable_sandbox=found.
|
# Check for sandbox support. If one is found, set enable_sandbox=found.
|
||||||
AS_CASE([$enable_sandbox],
|
AS_CASE([$enable_sandbox],
|
||||||
|
|
|
||||||
|
|
@ -26,6 +26,9 @@ if COND_ASM_X86
|
||||||
liblzma_la_SOURCES += check/crc32_x86.S
|
liblzma_la_SOURCES += check/crc32_x86.S
|
||||||
else
|
else
|
||||||
liblzma_la_SOURCES += check/crc32_fast.c
|
liblzma_la_SOURCES += check/crc32_fast.c
|
||||||
|
if COND_CRC_CLMUL
|
||||||
|
liblzma_la_SOURCES += check/crc_clmul.c
|
||||||
|
endif
|
||||||
endif
|
endif
|
||||||
endif
|
endif
|
||||||
endif
|
endif
|
||||||
|
|
|
||||||
|
|
@ -34,11 +34,11 @@
|
||||||
#include "check.h"
|
#include "check.h"
|
||||||
#include "crc_common.h"
|
#include "crc_common.h"
|
||||||
|
|
||||||
|
#ifdef CRC_GENERIC
|
||||||
|
|
||||||
///////////////////
|
///////////////////
|
||||||
// Generic CRC32 //
|
// Generic CRC32 //
|
||||||
///////////////////
|
///////////////////
|
||||||
#ifdef CRC_GENERIC
|
|
||||||
|
|
||||||
|
|
||||||
static uint32_t
|
static uint32_t
|
||||||
crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
|
crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
|
||||||
|
|
@ -99,118 +99,6 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
|
|
||||||
/////////////////////
|
|
||||||
// x86 CLMUL CRC32 //
|
|
||||||
/////////////////////
|
|
||||||
|
|
||||||
#ifdef CRC_CLMUL
|
|
||||||
|
|
||||||
#include <immintrin.h>
|
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
// These functions were used to generate the constants
|
|
||||||
// at the top of crc32_clmul().
|
|
||||||
static uint64_t
|
|
||||||
calc_lo(uint64_t p, uint64_t a, int n)
|
|
||||||
{
|
|
||||||
uint64_t b = 0; int i;
|
|
||||||
for (i = 0; i < n; i++) {
|
|
||||||
b = b >> 1 | (a & 1) << (n - 1);
|
|
||||||
a = (a >> 1) ^ ((0 - (a & 1)) & p);
|
|
||||||
}
|
|
||||||
return b;
|
|
||||||
}
|
|
||||||
|
|
||||||
// same as ~crc(&a, sizeof(a), ~0)
|
|
||||||
static uint64_t
|
|
||||||
calc_hi(uint64_t p, uint64_t a, int n)
|
|
||||||
{
|
|
||||||
int i;
|
|
||||||
for (i = 0; i < n; i++)
|
|
||||||
a = (a >> 1) ^ ((0 - (a & 1)) & p);
|
|
||||||
return a;
|
|
||||||
}
|
|
||||||
*/
|
|
||||||
|
|
||||||
|
|
||||||
// MSVC (VS2015 - VS2022) produces bad 32-bit x86 code from the CLMUL CRC
|
|
||||||
// code when optimizations are enabled (release build). According to the bug
|
|
||||||
// report, the ebx register is corrupted and the calculated result is wrong.
|
|
||||||
// Trying to workaround the problem with "__asm mov ebx, ebx" didn't help.
|
|
||||||
// The following pragma works and performance is still good. x86-64 builds
|
|
||||||
// aren't affected by this problem.
|
|
||||||
//
|
|
||||||
// NOTE: Another pragma after the function restores the optimizations.
|
|
||||||
// If the #if condition here is updated, the other one must be updated too.
|
|
||||||
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
|
||||||
&& defined(_M_IX86)
|
|
||||||
# pragma optimize("g", off)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// EDG-based compilers (Intel's classic compiler and compiler for E2K) can
|
|
||||||
// define __GNUC__ but the attribute must not be used with them.
|
|
||||||
// The new Clang-based ICX needs the attribute.
|
|
||||||
//
|
|
||||||
// NOTE: Build systems check for this too, keep them in sync with this.
|
|
||||||
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
|
||||||
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
|
||||||
#endif
|
|
||||||
static uint32_t
|
|
||||||
crc32_clmul(const uint8_t *buf, size_t size, uint32_t crc)
|
|
||||||
{
|
|
||||||
// The prototypes of the intrinsics use signed types while most of
|
|
||||||
// the values are treated as unsigned here. These warnings in this
|
|
||||||
// function have been checked and found to be harmless so silence them.
|
|
||||||
#if TUKLIB_GNUC_REQ(4, 6) || defined(__clang__)
|
|
||||||
# pragma GCC diagnostic push
|
|
||||||
# pragma GCC diagnostic ignored "-Wsign-conversion"
|
|
||||||
# pragma GCC diagnostic ignored "-Wconversion"
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS
|
|
||||||
// The code assumes that there is at least one byte of input.
|
|
||||||
if (size == 0)
|
|
||||||
return crc;
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// uint32_t poly = 0xedb88320;
|
|
||||||
uint64_t p = 0x1db710640; // p << 1
|
|
||||||
uint64_t mu = 0x1f7011641; // calc_lo(p, p, 32) << 1 | 1
|
|
||||||
uint64_t k5 = 0x163cd6124; // calc_hi(p, p, 32) << 1
|
|
||||||
uint64_t k4 = 0x0ccaa009e; // calc_hi(p, p, 64) << 1
|
|
||||||
uint64_t k3 = 0x1751997d0; // calc_hi(p, p, 128) << 1
|
|
||||||
|
|
||||||
__m128i vfold4 = _mm_set_epi64x(mu, p);
|
|
||||||
__m128i vfold8 = _mm_set_epi64x(0, k5);
|
|
||||||
__m128i vfold16 = _mm_set_epi64x(k4, k3);
|
|
||||||
|
|
||||||
__m128i v0, v1, v2;
|
|
||||||
|
|
||||||
crc_simd_body(buf, size, &v0, &v1, vfold16, _mm_cvtsi32_si128(~crc));
|
|
||||||
|
|
||||||
v1 = _mm_xor_si128(
|
|
||||||
_mm_clmulepi64_si128(v0, vfold16, 0x10), v1); // xxx0
|
|
||||||
v2 = _mm_shuffle_epi32(v1, 0xe7); // 0xx0
|
|
||||||
v0 = _mm_slli_epi64(v1, 32); // [0]
|
|
||||||
v0 = _mm_clmulepi64_si128(v0, vfold8, 0x00);
|
|
||||||
v0 = _mm_xor_si128(v0, v2); // [1] [2]
|
|
||||||
v2 = _mm_clmulepi64_si128(v0, vfold4, 0x10);
|
|
||||||
v2 = _mm_clmulepi64_si128(v2, vfold4, 0x00);
|
|
||||||
v0 = _mm_xor_si128(v0, v2); // [2]
|
|
||||||
return ~_mm_extract_epi32(v0, 2);
|
|
||||||
|
|
||||||
#if TUKLIB_GNUC_REQ(4, 6) || defined(__clang__)
|
|
||||||
# pragma GCC diagnostic pop
|
|
||||||
#endif
|
|
||||||
}
|
|
||||||
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
|
||||||
&& defined(_M_IX86)
|
|
||||||
# pragma optimize("", on)
|
|
||||||
#endif
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#if defined(CRC_GENERIC) && defined(CRC_CLMUL)
|
#if defined(CRC_GENERIC) && defined(CRC_CLMUL)
|
||||||
typedef uint32_t (*crc32_func_type)(
|
typedef uint32_t (*crc32_func_type)(
|
||||||
const uint8_t *buf, size_t size, uint32_t crc);
|
const uint8_t *buf, size_t size, uint32_t crc);
|
||||||
|
|
@ -226,7 +114,7 @@ typedef uint32_t (*crc32_func_type)(
|
||||||
static crc32_func_type
|
static crc32_func_type
|
||||||
crc32_resolve(void)
|
crc32_resolve(void)
|
||||||
{
|
{
|
||||||
return is_clmul_supported() ? &crc32_clmul : &crc32_generic;
|
return lzma_is_clmul_supported() ? &lzma_crc32_clmul : &crc32_generic;
|
||||||
}
|
}
|
||||||
|
|
||||||
#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__)
|
#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__)
|
||||||
|
|
@ -305,7 +193,7 @@ lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc)
|
||||||
return crc32_func(buf, size, crc);
|
return crc32_func(buf, size, crc);
|
||||||
|
|
||||||
#elif defined(CRC_CLMUL)
|
#elif defined(CRC_CLMUL)
|
||||||
return crc32_clmul(buf, size, crc);
|
return lzma_crc32_clmul(buf, size, crc);
|
||||||
|
|
||||||
#else
|
#else
|
||||||
return crc32_generic(buf, size, crc);
|
return crc32_generic(buf, size, crc);
|
||||||
|
|
|
||||||
|
|
@ -31,13 +31,12 @@
|
||||||
#include "check.h"
|
#include "check.h"
|
||||||
#include "crc_common.h"
|
#include "crc_common.h"
|
||||||
|
|
||||||
|
#ifdef CRC_GENERIC
|
||||||
|
|
||||||
/////////////////////////////////
|
/////////////////////////////////
|
||||||
// Generic slice-by-four CRC64 //
|
// Generic slice-by-four CRC64 //
|
||||||
/////////////////////////////////
|
/////////////////////////////////
|
||||||
|
|
||||||
#ifdef CRC_GENERIC
|
|
||||||
|
|
||||||
|
|
||||||
#ifdef WORDS_BIGENDIAN
|
#ifdef WORDS_BIGENDIAN
|
||||||
# define A1(x) ((x) >> 56)
|
# define A1(x) ((x) >> 56)
|
||||||
#else
|
#else
|
||||||
|
|
@ -93,125 +92,6 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
|
|
||||||
/////////////////////
|
|
||||||
// x86 CLMUL CRC64 //
|
|
||||||
/////////////////////
|
|
||||||
|
|
||||||
#ifdef CRC_CLMUL
|
|
||||||
|
|
||||||
#include <immintrin.h>
|
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
// These functions were used to generate the constants
|
|
||||||
// at the top of crc64_clmul().
|
|
||||||
static uint64_t
|
|
||||||
calc_lo(uint64_t poly)
|
|
||||||
{
|
|
||||||
uint64_t a = poly;
|
|
||||||
uint64_t b = 0;
|
|
||||||
|
|
||||||
for (unsigned i = 0; i < 64; ++i) {
|
|
||||||
b = (b >> 1) | (a << 63);
|
|
||||||
a = (a >> 1) ^ (a & 1 ? poly : 0);
|
|
||||||
}
|
|
||||||
|
|
||||||
return b;
|
|
||||||
}
|
|
||||||
|
|
||||||
static uint64_t
|
|
||||||
calc_hi(uint64_t poly, uint64_t a)
|
|
||||||
{
|
|
||||||
for (unsigned i = 0; i < 64; ++i)
|
|
||||||
a = (a >> 1) ^ (a & 1 ? poly : 0);
|
|
||||||
|
|
||||||
return a;
|
|
||||||
}
|
|
||||||
*/
|
|
||||||
|
|
||||||
|
|
||||||
// MSVC (VS2015 - VS2022) produces bad 32-bit x86 code from the CLMUL CRC
|
|
||||||
// code when optimizations are enabled (release build). According to the bug
|
|
||||||
// report, the ebx register is corrupted and the calculated result is wrong.
|
|
||||||
// Trying to workaround the problem with "__asm mov ebx, ebx" didn't help.
|
|
||||||
// The following pragma works and performance is still good. x86-64 builds
|
|
||||||
// aren't affected by this problem.
|
|
||||||
//
|
|
||||||
// NOTE: Another pragma after the function restores the optimizations.
|
|
||||||
// If the #if condition here is updated, the other one must be updated too.
|
|
||||||
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
|
||||||
&& defined(_M_IX86)
|
|
||||||
# pragma optimize("g", off)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// EDG-based compilers (Intel's classic compiler and compiler for E2K) can
|
|
||||||
// define __GNUC__ but the attribute must not be used with them.
|
|
||||||
// The new Clang-based ICX needs the attribute.
|
|
||||||
//
|
|
||||||
// NOTE: Build systems check for this too, keep them in sync with this.
|
|
||||||
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
|
||||||
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
|
||||||
#endif
|
|
||||||
static uint64_t
|
|
||||||
crc64_clmul(const uint8_t *buf, size_t size, uint64_t crc)
|
|
||||||
{
|
|
||||||
// The prototypes of the intrinsics use signed types while most of
|
|
||||||
// the values are treated as unsigned here. These warnings in this
|
|
||||||
// function have been checked and found to be harmless so silence them.
|
|
||||||
#if TUKLIB_GNUC_REQ(4, 6) || defined(__clang__)
|
|
||||||
# pragma GCC diagnostic push
|
|
||||||
# pragma GCC diagnostic ignored "-Wsign-conversion"
|
|
||||||
# pragma GCC diagnostic ignored "-Wconversion"
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS
|
|
||||||
// The code assumes that there is at least one byte of input.
|
|
||||||
if (size == 0)
|
|
||||||
return crc;
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// const uint64_t poly = 0xc96c5795d7870f42; // CRC polynomial
|
|
||||||
const uint64_t p = 0x92d8af2baf0e1e85; // (poly << 1) | 1
|
|
||||||
const uint64_t mu = 0x9c3e466c172963d5; // (calc_lo(poly) << 1) | 1
|
|
||||||
const uint64_t k2 = 0xdabe95afc7875f40; // calc_hi(poly, 1)
|
|
||||||
const uint64_t k1 = 0xe05dd497ca393ae4; // calc_hi(poly, k2)
|
|
||||||
|
|
||||||
const __m128i vfold8 = _mm_set_epi64x(p, mu);
|
|
||||||
const __m128i vfold16 = _mm_set_epi64x(k2, k1);
|
|
||||||
|
|
||||||
__m128i v0, v1, v2;
|
|
||||||
|
|
||||||
#if defined(__i386__) || defined(_M_IX86)
|
|
||||||
crc_simd_body(buf, size, &v0, &v1, vfold16, _mm_set_epi64x(0, ~crc));
|
|
||||||
#else
|
|
||||||
// GCC and Clang would produce good code with _mm_set_epi64x
|
|
||||||
// but MSVC needs _mm_cvtsi64_si128 on x86-64.
|
|
||||||
crc_simd_body(buf, size, &v0, &v1, vfold16, _mm_cvtsi64_si128(~crc));
|
|
||||||
#endif
|
|
||||||
|
|
||||||
v1 = _mm_xor_si128(_mm_clmulepi64_si128(v0, vfold16, 0x10), v1);
|
|
||||||
v0 = _mm_clmulepi64_si128(v1, vfold8, 0x00);
|
|
||||||
v2 = _mm_clmulepi64_si128(v0, vfold8, 0x10);
|
|
||||||
v0 = _mm_xor_si128(_mm_xor_si128(v1, _mm_slli_si128(v0, 8)), v2);
|
|
||||||
|
|
||||||
#if defined(__i386__) || defined(_M_IX86)
|
|
||||||
return ~(((uint64_t)(uint32_t)_mm_extract_epi32(v0, 3) << 32) |
|
|
||||||
(uint64_t)(uint32_t)_mm_extract_epi32(v0, 2));
|
|
||||||
#else
|
|
||||||
return ~(uint64_t)_mm_extract_epi64(v0, 1);
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#if TUKLIB_GNUC_REQ(4, 6) || defined(__clang__)
|
|
||||||
# pragma GCC diagnostic pop
|
|
||||||
#endif
|
|
||||||
}
|
|
||||||
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
|
||||||
&& defined(_M_IX86)
|
|
||||||
# pragma optimize("", on)
|
|
||||||
#endif
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#if defined(CRC_GENERIC) && defined(CRC_CLMUL)
|
#if defined(CRC_GENERIC) && defined(CRC_CLMUL)
|
||||||
typedef uint64_t (*crc64_func_type)(
|
typedef uint64_t (*crc64_func_type)(
|
||||||
const uint8_t *buf, size_t size, uint64_t crc);
|
const uint8_t *buf, size_t size, uint64_t crc);
|
||||||
|
|
@ -227,7 +107,7 @@ typedef uint64_t (*crc64_func_type)(
|
||||||
static crc64_func_type
|
static crc64_func_type
|
||||||
crc64_resolve(void)
|
crc64_resolve(void)
|
||||||
{
|
{
|
||||||
return is_clmul_supported() ? &crc64_clmul : &crc64_generic;
|
return lzma_is_clmul_supported() ? &lzma_crc64_clmul : &crc64_generic;
|
||||||
}
|
}
|
||||||
|
|
||||||
#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__)
|
#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__)
|
||||||
|
|
@ -322,7 +202,7 @@ lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
|
||||||
//
|
//
|
||||||
// FIXME: Lookup table isn't currently omitted on 32-bit x86,
|
// FIXME: Lookup table isn't currently omitted on 32-bit x86,
|
||||||
// see crc64_table.c.
|
// see crc64_table.c.
|
||||||
return crc64_clmul(buf, size, crc);
|
return lzma_crc64_clmul(buf, size, crc);
|
||||||
|
|
||||||
#else
|
#else
|
||||||
return crc64_generic(buf, size, crc);
|
return crc64_generic(buf, size, crc);
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,414 @@
|
||||||
|
///////////////////////////////////////////////////////////////////////////////
|
||||||
|
//
|
||||||
|
/// \file crc_clmul.c
|
||||||
|
/// \brief CRC32 and CRC64 implementations using CLMUL instructions.
|
||||||
|
///
|
||||||
|
/// lzma_crc32_clmul() and lzma_crc64_clmul() use 32/64-bit x86
|
||||||
|
/// SSSE3, SSE4.1, and CLMUL instructions. This is compatible with
|
||||||
|
/// Elbrus 2000 (E2K) too.
|
||||||
|
///
|
||||||
|
/// They were derived from
|
||||||
|
/// https://www.researchgate.net/publication/263424619_Fast_CRC_computation
|
||||||
|
/// and the public domain code from https://github.com/rawrunprotected/crc
|
||||||
|
/// (URLs were checked on 2023-10-14).
|
||||||
|
///
|
||||||
|
/// FIXME: Builds for 32-bit x86 use the assembly .S files by default
|
||||||
|
/// unless configured with --disable-assembler. Even then the lookup table
|
||||||
|
/// isn't omitted in crc64_table.c since it doesn't know that assembly
|
||||||
|
/// code has been disabled.
|
||||||
|
//
|
||||||
|
// Authors: Ilya Kurdyukov
|
||||||
|
// Hans Jansen
|
||||||
|
// Lasse Collin
|
||||||
|
// Jia Tan
|
||||||
|
//
|
||||||
|
//
|
||||||
|
// This file has been put into the public domain.
|
||||||
|
// You can do whatever you want with this file.
|
||||||
|
//
|
||||||
|
///////////////////////////////////////////////////////////////////////////////
|
||||||
|
|
||||||
|
#include "common.h"
|
||||||
|
#include "crc_common.h"
|
||||||
|
#include <immintrin.h>
|
||||||
|
|
||||||
|
|
||||||
|
#define MASK_L(in, mask, r) r = _mm_shuffle_epi8(in, mask)
|
||||||
|
|
||||||
|
#define MASK_H(in, mask, r) \
|
||||||
|
r = _mm_shuffle_epi8(in, _mm_xor_si128(mask, vsign))
|
||||||
|
|
||||||
|
#define MASK_LH(in, mask, low, high) \
|
||||||
|
MASK_L(in, mask, low); \
|
||||||
|
MASK_H(in, mask, high)
|
||||||
|
|
||||||
|
|
||||||
|
// MSVC (VS2015 - VS2022) produces bad 32-bit x86 code from the CLMUL CRC
|
||||||
|
// code when optimizations are enabled (release build). According to the bug
|
||||||
|
// report, the ebx register is corrupted and the calculated result is wrong.
|
||||||
|
// Trying to workaround the problem with "__asm mov ebx, ebx" didn't help.
|
||||||
|
// The following pragma works and performance is still good. x86-64 builds
|
||||||
|
// aren't affected by this problem.
|
||||||
|
//
|
||||||
|
// NOTE: Another pragma after lzma_crc64_clmul() restores the optimizations.
|
||||||
|
// If the #if condition here is updated, the other one must be updated too.
|
||||||
|
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
||||||
|
&& defined(_M_IX86)
|
||||||
|
# pragma optimize("g", off)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
|
||||||
|
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
||||||
|
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
||||||
|
#endif
|
||||||
|
#if lzma_has_attribute(__no_sanitize_address__)
|
||||||
|
__attribute__((__no_sanitize_address__))
|
||||||
|
#endif
|
||||||
|
static inline void
|
||||||
|
crc_simd_body(const uint8_t *buf, const size_t size, __m128i *v0, __m128i *v1,
|
||||||
|
const __m128i vfold16, const __m128i initial_crc)
|
||||||
|
{
|
||||||
|
// Create a vector with 8-bit values 0 to 15. This is used to
|
||||||
|
// construct control masks for _mm_blendv_epi8 and _mm_shuffle_epi8.
|
||||||
|
const __m128i vramp = _mm_setr_epi32(
|
||||||
|
0x03020100, 0x07060504, 0x0b0a0908, 0x0f0e0d0c);
|
||||||
|
|
||||||
|
// This is used to inverse the control mask of _mm_shuffle_epi8
|
||||||
|
// so that bytes that wouldn't be picked with the original mask
|
||||||
|
// will be picked and vice versa.
|
||||||
|
const __m128i vsign = _mm_set1_epi8(-0x80);
|
||||||
|
|
||||||
|
// Memory addresses A to D and the distances between them:
|
||||||
|
//
|
||||||
|
// A B C D
|
||||||
|
// [skip_start][size][skip_end]
|
||||||
|
// [ size2 ]
|
||||||
|
//
|
||||||
|
// A and D are 16-byte aligned. B and C are 1-byte aligned.
|
||||||
|
// skip_start and skip_end are 0-15 bytes. size is at least 1 byte.
|
||||||
|
//
|
||||||
|
// A = aligned_buf will initially point to this address.
|
||||||
|
// B = The address pointed by the caller-supplied buf.
|
||||||
|
// C = buf + size == aligned_buf + size2
|
||||||
|
// D = buf + size + skip_end == aligned_buf + size2 + skip_end
|
||||||
|
const size_t skip_start = (size_t)((uintptr_t)buf & 15);
|
||||||
|
const size_t skip_end = (size_t)((0U - (uintptr_t)(buf + size)) & 15);
|
||||||
|
const __m128i *aligned_buf = (const __m128i *)(
|
||||||
|
(uintptr_t)buf & ~(uintptr_t)15);
|
||||||
|
|
||||||
|
// If size2 <= 16 then the whole input fits into a single 16-byte
|
||||||
|
// vector. If size2 > 16 then at least two 16-byte vectors must
|
||||||
|
// be processed. If size2 > 16 && size <= 16 then there is only
|
||||||
|
// one 16-byte vector's worth of input but it is unaligned in memory.
|
||||||
|
//
|
||||||
|
// NOTE: There is no integer overflow here if the arguments
|
||||||
|
// are valid. If this overflowed, buf + size would too.
|
||||||
|
const size_t size2 = skip_start + size;
|
||||||
|
|
||||||
|
// Masks to be used with _mm_blendv_epi8 and _mm_shuffle_epi8:
|
||||||
|
// The first skip_start or skip_end bytes in the vectors will have
|
||||||
|
// the high bit (0x80) set. _mm_blendv_epi8 and _mm_shuffle_epi8
|
||||||
|
// will produce zeros for these positions. (Bitwise-xor of these
|
||||||
|
// masks with vsign will produce the opposite behavior.)
|
||||||
|
const __m128i mask_start
|
||||||
|
= _mm_sub_epi8(vramp, _mm_set1_epi8((char)skip_start));
|
||||||
|
const __m128i mask_end
|
||||||
|
= _mm_sub_epi8(vramp, _mm_set1_epi8((char)skip_end));
|
||||||
|
|
||||||
|
// Get the first 1-16 bytes into data0. If loading less than 16
|
||||||
|
// bytes, the bytes are loaded to the high bits of the vector and
|
||||||
|
// the least significant positions are filled with zeros.
|
||||||
|
const __m128i data0 = _mm_blendv_epi8(_mm_load_si128(aligned_buf),
|
||||||
|
_mm_setzero_si128(), mask_start);
|
||||||
|
aligned_buf++;
|
||||||
|
|
||||||
|
__m128i v2, v3;
|
||||||
|
|
||||||
|
#ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS
|
||||||
|
if (size <= 16) {
|
||||||
|
// Right-shift initial_crc by 1-16 bytes based on "size"
|
||||||
|
// and store the result in v1 (high bytes) and v0 (low bytes).
|
||||||
|
//
|
||||||
|
// NOTE: The highest 8 bytes of initial_crc are zeros so
|
||||||
|
// v1 will be filled with zeros if size >= 8. The highest
|
||||||
|
// 8 bytes of v1 will always become zeros.
|
||||||
|
//
|
||||||
|
// [ v1 ][ v0 ]
|
||||||
|
// [ initial_crc ] size == 1
|
||||||
|
// [ initial_crc ] size == 2
|
||||||
|
// [ initial_crc ] size == 15
|
||||||
|
// [ initial_crc ] size == 16 (all in v0)
|
||||||
|
const __m128i mask_low = _mm_add_epi8(
|
||||||
|
vramp, _mm_set1_epi8((char)(size - 16)));
|
||||||
|
MASK_LH(initial_crc, mask_low, *v0, *v1);
|
||||||
|
|
||||||
|
if (size2 <= 16) {
|
||||||
|
// There are 1-16 bytes of input and it is all
|
||||||
|
// in data0. Copy the input bytes to v3. If there
|
||||||
|
// are fewer than 16 bytes, the low bytes in v3
|
||||||
|
// will be filled with zeros. That is, the input
|
||||||
|
// bytes are stored to the same position as
|
||||||
|
// (part of) initial_crc is in v0.
|
||||||
|
MASK_L(data0, mask_end, v3);
|
||||||
|
} else {
|
||||||
|
// There are 2-16 bytes of input but not all bytes
|
||||||
|
// are in data0.
|
||||||
|
const __m128i data1 = _mm_load_si128(aligned_buf);
|
||||||
|
|
||||||
|
// Collect the 2-16 input bytes from data0 and data1
|
||||||
|
// to v2 and v3, and bitwise-xor them with the
|
||||||
|
// low bits of initial_crc in v0. Note that the
|
||||||
|
// the second xor is below this else-block as it
|
||||||
|
// is shared with the other branch.
|
||||||
|
MASK_H(data0, mask_end, v2);
|
||||||
|
MASK_L(data1, mask_end, v3);
|
||||||
|
*v0 = _mm_xor_si128(*v0, v2);
|
||||||
|
}
|
||||||
|
|
||||||
|
*v0 = _mm_xor_si128(*v0, v3);
|
||||||
|
*v1 = _mm_alignr_epi8(*v1, *v0, 8);
|
||||||
|
} else
|
||||||
|
#endif
|
||||||
|
{
|
||||||
|
// There is more than 16 bytes of input.
|
||||||
|
const __m128i data1 = _mm_load_si128(aligned_buf);
|
||||||
|
const __m128i *end = (const __m128i*)(
|
||||||
|
(const char *)aligned_buf - 16 + size2);
|
||||||
|
aligned_buf++;
|
||||||
|
|
||||||
|
MASK_LH(initial_crc, mask_start, *v0, *v1);
|
||||||
|
*v0 = _mm_xor_si128(*v0, data0);
|
||||||
|
*v1 = _mm_xor_si128(*v1, data1);
|
||||||
|
|
||||||
|
while (aligned_buf < end) {
|
||||||
|
*v1 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(
|
||||||
|
*v0, vfold16, 0x00));
|
||||||
|
*v0 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(
|
||||||
|
*v0, vfold16, 0x11));
|
||||||
|
*v1 = _mm_load_si128(aligned_buf++);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (aligned_buf != end) {
|
||||||
|
MASK_H(*v0, mask_end, v2);
|
||||||
|
MASK_L(*v0, mask_end, *v0);
|
||||||
|
MASK_L(*v1, mask_end, v3);
|
||||||
|
*v1 = _mm_or_si128(v2, v3);
|
||||||
|
}
|
||||||
|
|
||||||
|
*v1 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(
|
||||||
|
*v0, vfold16, 0x00));
|
||||||
|
*v0 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(
|
||||||
|
*v0, vfold16, 0x11));
|
||||||
|
*v1 = _mm_srli_si128(*v0, 8);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/////////////////////
|
||||||
|
// x86 CLMUL CRC32 //
|
||||||
|
/////////////////////
|
||||||
|
|
||||||
|
/*
|
||||||
|
// These functions were used to generate the constants
|
||||||
|
// at the top of lzma_crc32_clmul().
|
||||||
|
static uint64_t
|
||||||
|
calc_lo(uint64_t p, uint64_t a, int n)
|
||||||
|
{
|
||||||
|
uint64_t b = 0; int i;
|
||||||
|
for (i = 0; i < n; i++) {
|
||||||
|
b = b >> 1 | (a & 1) << (n - 1);
|
||||||
|
a = (a >> 1) ^ ((0 - (a & 1)) & p);
|
||||||
|
}
|
||||||
|
return b;
|
||||||
|
}
|
||||||
|
|
||||||
|
// same as ~crc(&a, sizeof(a), ~0)
|
||||||
|
static uint64_t
|
||||||
|
calc_hi(uint64_t p, uint64_t a, int n)
|
||||||
|
{
|
||||||
|
int i;
|
||||||
|
for (i = 0; i < n; i++)
|
||||||
|
a = (a >> 1) ^ ((0 - (a & 1)) & p);
|
||||||
|
return a;
|
||||||
|
}
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifdef HAVE_CHECK_CRC32
|
||||||
|
|
||||||
|
// EDG-based compilers (Intel's classic compiler and compiler for E2K) can
|
||||||
|
// define __GNUC__ but the attribute must not be used with them.
|
||||||
|
// The new Clang-based ICX needs the attribute.
|
||||||
|
//
|
||||||
|
// NOTE: Build systems check for this too, keep them in sync with this.
|
||||||
|
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
||||||
|
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
||||||
|
#endif
|
||||||
|
extern uint32_t
|
||||||
|
lzma_crc32_clmul(const uint8_t *buf, size_t size, uint32_t crc)
|
||||||
|
{
|
||||||
|
#ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS
|
||||||
|
// The code assumes that there is at least one byte of input.
|
||||||
|
if (size == 0)
|
||||||
|
return crc;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
// uint32_t poly = 0xedb88320;
|
||||||
|
const int64_t p = 0x1db710640; // p << 1
|
||||||
|
const int64_t mu = 0x1f7011641; // calc_lo(p, p, 32) << 1 | 1
|
||||||
|
const int64_t k5 = 0x163cd6124; // calc_hi(p, p, 32) << 1
|
||||||
|
const int64_t k4 = 0x0ccaa009e; // calc_hi(p, p, 64) << 1
|
||||||
|
const int64_t k3 = 0x1751997d0; // calc_hi(p, p, 128) << 1
|
||||||
|
|
||||||
|
const __m128i vfold4 = _mm_set_epi64x(mu, p);
|
||||||
|
const __m128i vfold8 = _mm_set_epi64x(0, k5);
|
||||||
|
const __m128i vfold16 = _mm_set_epi64x(k4, k3);
|
||||||
|
|
||||||
|
__m128i v0, v1, v2;
|
||||||
|
|
||||||
|
crc_simd_body(buf, size, &v0, &v1, vfold16,
|
||||||
|
_mm_cvtsi32_si128((int32_t)~crc));
|
||||||
|
|
||||||
|
v1 = _mm_xor_si128(
|
||||||
|
_mm_clmulepi64_si128(v0, vfold16, 0x10), v1); // xxx0
|
||||||
|
v2 = _mm_shuffle_epi32(v1, 0xe7); // 0xx0
|
||||||
|
v0 = _mm_slli_epi64(v1, 32); // [0]
|
||||||
|
v0 = _mm_clmulepi64_si128(v0, vfold8, 0x00);
|
||||||
|
v0 = _mm_xor_si128(v0, v2); // [1] [2]
|
||||||
|
v2 = _mm_clmulepi64_si128(v0, vfold4, 0x10);
|
||||||
|
v2 = _mm_clmulepi64_si128(v2, vfold4, 0x00);
|
||||||
|
v0 = _mm_xor_si128(v0, v2); // [2]
|
||||||
|
return ~(uint32_t)_mm_extract_epi32(v0, 2);
|
||||||
|
}
|
||||||
|
#endif // HAVE_CHECK_CRC32
|
||||||
|
|
||||||
|
|
||||||
|
/////////////////////
|
||||||
|
// x86 CLMUL CRC64 //
|
||||||
|
/////////////////////
|
||||||
|
|
||||||
|
/*
|
||||||
|
// These functions were used to generate the constants
|
||||||
|
// at the top of lzma_crc64_clmul().
|
||||||
|
static uint64_t
|
||||||
|
calc_lo(uint64_t poly)
|
||||||
|
{
|
||||||
|
uint64_t a = poly;
|
||||||
|
uint64_t b = 0;
|
||||||
|
|
||||||
|
for (unsigned i = 0; i < 64; ++i) {
|
||||||
|
b = (b >> 1) | (a << 63);
|
||||||
|
a = (a >> 1) ^ (a & 1 ? poly : 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
return b;
|
||||||
|
}
|
||||||
|
|
||||||
|
static uint64_t
|
||||||
|
calc_hi(uint64_t poly, uint64_t a)
|
||||||
|
{
|
||||||
|
for (unsigned i = 0; i < 64; ++i)
|
||||||
|
a = (a >> 1) ^ (a & 1 ? poly : 0);
|
||||||
|
|
||||||
|
return a;
|
||||||
|
}
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifdef HAVE_CHECK_CRC64
|
||||||
|
|
||||||
|
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
||||||
|
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
||||||
|
#endif
|
||||||
|
extern uint64_t
|
||||||
|
lzma_crc64_clmul(const uint8_t *buf, size_t size, uint64_t crc)
|
||||||
|
{
|
||||||
|
#ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS
|
||||||
|
// The code assumes that there is at least one byte of input.
|
||||||
|
if (size == 0)
|
||||||
|
return crc;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
// const uint64_t poly = 0xc96c5795d7870f42; // CRC polynomial
|
||||||
|
const uint64_t p = 0x92d8af2baf0e1e85; // (poly << 1) | 1
|
||||||
|
const uint64_t mu = 0x9c3e466c172963d5; // (calc_lo(poly) << 1) | 1
|
||||||
|
const uint64_t k2 = 0xdabe95afc7875f40; // calc_hi(poly, 1)
|
||||||
|
const uint64_t k1 = 0xe05dd497ca393ae4; // calc_hi(poly, k2)
|
||||||
|
|
||||||
|
const __m128i vfold8 = _mm_set_epi64x((int64_t)p, (int64_t)mu);
|
||||||
|
const __m128i vfold16 = _mm_set_epi64x((int64_t)k2, (int64_t)k1);
|
||||||
|
|
||||||
|
__m128i v0, v1, v2;
|
||||||
|
|
||||||
|
#if defined(__i386__) || defined(_M_IX86)
|
||||||
|
crc_simd_body(buf, size, &v0, &v1, vfold16,
|
||||||
|
_mm_set_epi64x(0, (int64_t)~crc));
|
||||||
|
#else
|
||||||
|
// GCC and Clang would produce good code with _mm_set_epi64x
|
||||||
|
// but MSVC needs _mm_cvtsi64_si128 on x86-64.
|
||||||
|
crc_simd_body(buf, size, &v0, &v1, vfold16,
|
||||||
|
_mm_cvtsi64_si128((int64_t)~crc));
|
||||||
|
#endif
|
||||||
|
|
||||||
|
v1 = _mm_xor_si128(_mm_clmulepi64_si128(v0, vfold16, 0x10), v1);
|
||||||
|
v0 = _mm_clmulepi64_si128(v1, vfold8, 0x00);
|
||||||
|
v2 = _mm_clmulepi64_si128(v0, vfold8, 0x10);
|
||||||
|
v0 = _mm_xor_si128(_mm_xor_si128(v1, _mm_slli_si128(v0, 8)), v2);
|
||||||
|
|
||||||
|
#if defined(__i386__) || defined(_M_IX86)
|
||||||
|
return ~(((uint64_t)(uint32_t)_mm_extract_epi32(v0, 3) << 32) |
|
||||||
|
(uint64_t)(uint32_t)_mm_extract_epi32(v0, 2));
|
||||||
|
#else
|
||||||
|
return ~(uint64_t)_mm_extract_epi64(v0, 1);
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
#endif // HAVE_CHECK_CRC64
|
||||||
|
|
||||||
|
|
||||||
|
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
|
||||||
|
&& defined(_M_IX86)
|
||||||
|
# pragma optimize("", on)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
|
||||||
|
////////////////////////
|
||||||
|
// Detect CPU support //
|
||||||
|
////////////////////////
|
||||||
|
|
||||||
|
extern bool
|
||||||
|
lzma_is_clmul_supported(void)
|
||||||
|
{
|
||||||
|
int success = 1;
|
||||||
|
uint32_t r[4]; // eax, ebx, ecx, edx
|
||||||
|
|
||||||
|
#if defined(_MSC_VER)
|
||||||
|
// This needs <intrin.h> with MSVC. ICC has it as a built-in
|
||||||
|
// on all platforms.
|
||||||
|
__cpuid(r, 1);
|
||||||
|
#elif defined(HAVE_CPUID_H)
|
||||||
|
// Compared to just using __asm__ to run CPUID, this also checks
|
||||||
|
// that CPUID is supported and saves and restores ebx as that is
|
||||||
|
// needed with GCC < 5 with position-independent code (PIC).
|
||||||
|
success = __get_cpuid(1, &r[0], &r[1], &r[2], &r[3]);
|
||||||
|
#else
|
||||||
|
// Just a fallback that shouldn't be needed.
|
||||||
|
__asm__("cpuid\n\t"
|
||||||
|
: "=a"(r[0]), "=b"(r[1]), "=c"(r[2]), "=d"(r[3])
|
||||||
|
: "a"(1), "c"(0));
|
||||||
|
#endif
|
||||||
|
|
||||||
|
// Returns true if these are supported:
|
||||||
|
// CLMUL (bit 1 in ecx)
|
||||||
|
// SSSE3 (bit 9 in ecx)
|
||||||
|
// SSE4.1 (bit 19 in ecx)
|
||||||
|
const uint32_t ecx_mask = (1 << 1) | (1 << 9) | (1 << 19);
|
||||||
|
return success && (r[2] & ecx_mask) == ecx_mask;
|
||||||
|
|
||||||
|
// Alternative methods that weren't used:
|
||||||
|
// - ICC's _may_i_use_cpu_feature: the other methods should work too.
|
||||||
|
// - GCC >= 6 / Clang / ICX __builtin_cpu_supports("pclmul")
|
||||||
|
//
|
||||||
|
// CPUID decding is needed with MSVC anyway and older GCC. This keeps
|
||||||
|
// the feature checks in the build system simpler too. The nice thing
|
||||||
|
// about __builtin_cpu_supports would be that it generates very short
|
||||||
|
// code as is it only reads a variable set at startup but a few bytes
|
||||||
|
// doesn't matter here.
|
||||||
|
}
|
||||||
|
|
@ -6,6 +6,7 @@
|
||||||
// Authors: Lasse Collin
|
// Authors: Lasse Collin
|
||||||
// Ilya Kurdyukov
|
// Ilya Kurdyukov
|
||||||
// Hans Jansen
|
// Hans Jansen
|
||||||
|
// Jia Tan
|
||||||
//
|
//
|
||||||
// This file has been put into the public domain.
|
// This file has been put into the public domain.
|
||||||
// You can do whatever you want with this file.
|
// You can do whatever you want with this file.
|
||||||
|
|
@ -77,185 +78,14 @@
|
||||||
# endif
|
# endif
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
////////////////////////
|
/// Detect at runtime if the CPU supports the x86 CLMUL instruction when
|
||||||
// Detect CPU support //
|
/// both the generic and CLMUL implementations are built.
|
||||||
////////////////////////
|
extern bool lzma_is_clmul_supported(void);
|
||||||
|
|
||||||
#if defined(CRC_GENERIC) && defined(CRC_CLMUL)
|
/// CRC32 implemented with the x86 CLMUL instruction.
|
||||||
static inline bool
|
extern uint32_t lzma_crc32_clmul(const uint8_t *buf, size_t size,
|
||||||
is_clmul_supported(void)
|
uint32_t crc);
|
||||||
{
|
|
||||||
int success = 1;
|
|
||||||
uint32_t r[4]; // eax, ebx, ecx, edx
|
|
||||||
|
|
||||||
#if defined(_MSC_VER)
|
/// CRC64 implemented with the x86 CLMUL instruction.
|
||||||
// This needs <intrin.h> with MSVC. ICC has it as a built-in
|
extern uint64_t lzma_crc64_clmul(const uint8_t *buf, size_t size,
|
||||||
// on all platforms.
|
uint64_t crc);
|
||||||
__cpuid(r, 1);
|
|
||||||
#elif defined(HAVE_CPUID_H)
|
|
||||||
// Compared to just using __asm__ to run CPUID, this also checks
|
|
||||||
// that CPUID is supported and saves and restores ebx as that is
|
|
||||||
// needed with GCC < 5 with position-independent code (PIC).
|
|
||||||
success = __get_cpuid(1, &r[0], &r[1], &r[2], &r[3]);
|
|
||||||
#else
|
|
||||||
// Just a fallback that shouldn't be needed.
|
|
||||||
__asm__("cpuid\n\t"
|
|
||||||
: "=a"(r[0]), "=b"(r[1]), "=c"(r[2]), "=d"(r[3])
|
|
||||||
: "a"(1), "c"(0));
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// Returns true if these are supported:
|
|
||||||
// CLMUL (bit 1 in ecx)
|
|
||||||
// SSSE3 (bit 9 in ecx)
|
|
||||||
// SSE4.1 (bit 19 in ecx)
|
|
||||||
const uint32_t ecx_mask = (1 << 1) | (1 << 9) | (1 << 19);
|
|
||||||
return success && (r[2] & ecx_mask) == ecx_mask;
|
|
||||||
|
|
||||||
// Alternative methods that weren't used:
|
|
||||||
// - ICC's _may_i_use_cpu_feature: the other methods should work too.
|
|
||||||
// - GCC >= 6 / Clang / ICX __builtin_cpu_supports("pclmul")
|
|
||||||
//
|
|
||||||
// CPUID decding is needed with MSVC anyway and older GCC. This keeps
|
|
||||||
// the feature checks in the build system simpler too. The nice thing
|
|
||||||
// about __builtin_cpu_supports would be that it generates very short
|
|
||||||
// code as is it only reads a variable set at startup but a few bytes
|
|
||||||
// doesn't matter here.
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
||||||
|
|
||||||
#define MASK_L(in, mask, r) r = _mm_shuffle_epi8(in, mask);
|
|
||||||
#define MASK_H(in, mask, r) \
|
|
||||||
r = _mm_shuffle_epi8(in, _mm_xor_si128(mask, vsign));
|
|
||||||
#define MASK_LH(in, mask, low, high) \
|
|
||||||
MASK_L(in, mask, low) MASK_H(in, mask, high)
|
|
||||||
|
|
||||||
#ifdef CRC_CLMUL
|
|
||||||
|
|
||||||
#include <immintrin.h>
|
|
||||||
|
|
||||||
|
|
||||||
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
|
|
||||||
__attribute__((__target__("ssse3,sse4.1,pclmul")))
|
|
||||||
#endif
|
|
||||||
#if lzma_has_attribute(__no_sanitize_address__)
|
|
||||||
__attribute__((__no_sanitize_address__))
|
|
||||||
#endif
|
|
||||||
static inline void
|
|
||||||
crc_simd_body(const uint8_t *buf, size_t size, __m128i *v0, __m128i *v1,
|
|
||||||
__m128i vfold16, __m128i crc2vec)
|
|
||||||
{
|
|
||||||
#if TUKLIB_GNUC_REQ(4, 6) || defined(__clang__)
|
|
||||||
# pragma GCC diagnostic push
|
|
||||||
# pragma GCC diagnostic ignored "-Wsign-conversion"
|
|
||||||
#endif
|
|
||||||
// Memory addresses A to D and the distances between them:
|
|
||||||
//
|
|
||||||
// A B C D
|
|
||||||
// [skip_start][size][skip_end]
|
|
||||||
// [ size2 ]
|
|
||||||
//
|
|
||||||
// A and D are 16-byte aligned. B and C are 1-byte aligned.
|
|
||||||
// skip_start and skip_end are 0-15 bytes. size is at least 1 byte.
|
|
||||||
//
|
|
||||||
// A = aligned_buf will initially point to this address.
|
|
||||||
// B = The address pointed by the caller-supplied buf.
|
|
||||||
// C = buf + size == aligned_buf + size2
|
|
||||||
// D = buf + size + skip_end == aligned_buf + size2 + skip_end
|
|
||||||
uintptr_t skip_start = (uintptr_t)buf & 15;
|
|
||||||
uintptr_t skip_end = -(uintptr_t)(buf + size) & 15;
|
|
||||||
|
|
||||||
// Create a vector with 8-bit values 0 to 15.
|
|
||||||
// This is used to construct control masks
|
|
||||||
// for _mm_blendv_epi8 and _mm_shuffle_epi8.
|
|
||||||
__m128i vramp = _mm_setr_epi32(
|
|
||||||
0x03020100, 0x07060504, 0x0b0a0908, 0x0f0e0d0c);
|
|
||||||
|
|
||||||
// This is used to inverse the control mask of _mm_shuffle_epi8
|
|
||||||
// so that bytes that wouldn't be picked with the original mask
|
|
||||||
// will be picked and vice versa.
|
|
||||||
__m128i vsign = _mm_set1_epi8(-0x80);
|
|
||||||
|
|
||||||
// Masks to be used with _mm_blendv_epi8 and _mm_shuffle_epi8
|
|
||||||
// The first skip_start or skip_end bytes in the vectors will hav
|
|
||||||
// the high bit (0x80) set. _mm_blendv_epi8 and _mm_shuffle_epi
|
|
||||||
// will produce zeros for these positions. (Bitwise-xor of thes
|
|
||||||
// masks with vsign will produce the opposite behavior.)
|
|
||||||
__m128i mask_start = _mm_sub_epi8(vramp, _mm_set1_epi8(skip_start));
|
|
||||||
__m128i mask_end = _mm_sub_epi8(vramp, _mm_set1_epi8(skip_end));
|
|
||||||
|
|
||||||
// If size2 <= 16 then the whole input fits into a single 16-byte
|
|
||||||
// vector. If size2 > 16 then at least two 16-byte vectors must
|
|
||||||
// be processed. If size2 > 16 && size <= 16 then there is only
|
|
||||||
// one 16-byte vector's worth of input but it is unaligned in memory.
|
|
||||||
//
|
|
||||||
// NOTE: There is no integer overflow here if the arguments
|
|
||||||
// are valid. If this overflowed, buf + size would too.
|
|
||||||
uintptr_t size2 = skip_start + size;
|
|
||||||
const __m128i *aligned_buf = (const __m128i*)((uintptr_t)buf & -16);
|
|
||||||
__m128i v2, v3, vcrc, data0;
|
|
||||||
|
|
||||||
vcrc = crc2vec;
|
|
||||||
|
|
||||||
// Get the first 1-16 bytes into data0. If loading less than 16
|
|
||||||
// bytes, the bytes are loaded to the high bits of the vector and
|
|
||||||
// the least significant positions are filled with zeros.
|
|
||||||
data0 = _mm_load_si128(aligned_buf);
|
|
||||||
data0 = _mm_blendv_epi8(data0, _mm_setzero_si128(), mask_start);
|
|
||||||
aligned_buf++;
|
|
||||||
if (size2 <= 16) {
|
|
||||||
// There are 1-16 bytes of input and it is all
|
|
||||||
// in data0. Copy the input bytes to v3. If there
|
|
||||||
// are fewer than 16 bytes, the low bytes in v3
|
|
||||||
// will be filled with zeros. That is, the input
|
|
||||||
// bytes are stored to the same position as
|
|
||||||
// (part of) initial_crc is in v0.
|
|
||||||
__m128i mask_low = _mm_add_epi8(
|
|
||||||
vramp, _mm_set1_epi8(size - 16));
|
|
||||||
MASK_LH(vcrc, mask_low, *v0, *v1)
|
|
||||||
MASK_L(data0, mask_end, v3)
|
|
||||||
*v0 = _mm_xor_si128(*v0, v3);
|
|
||||||
*v1 = _mm_alignr_epi8(*v1, *v0, 8);
|
|
||||||
} else {
|
|
||||||
__m128i data1 = _mm_load_si128(aligned_buf);
|
|
||||||
if (size <= 16) {
|
|
||||||
// Collect the 2-16 input bytes from data0 and data1
|
|
||||||
// to v2 and v3, and bitwise-xor them with the
|
|
||||||
// low bits of initial_crc in v0. Note that the
|
|
||||||
// the second xor is below this else-block as it
|
|
||||||
// is shared with the other branch.
|
|
||||||
__m128i mask_low = _mm_add_epi8(
|
|
||||||
vramp, _mm_set1_epi8(size - 16));
|
|
||||||
MASK_LH(vcrc, mask_low, *v0, *v1);
|
|
||||||
MASK_H(data0, mask_end, v2)
|
|
||||||
MASK_L(data1, mask_end, v3)
|
|
||||||
*v0 = _mm_xor_si128(*v0, v2);
|
|
||||||
*v0 = _mm_xor_si128(*v0, v3);
|
|
||||||
|
|
||||||
*v1 = _mm_alignr_epi8(*v1, *v0, 8);
|
|
||||||
} else {
|
|
||||||
const __m128i *end = (const __m128i*)(
|
|
||||||
(char*)aligned_buf++ - 16 + size2);
|
|
||||||
MASK_LH(vcrc, mask_start, *v0, *v1)
|
|
||||||
*v0 = _mm_xor_si128(*v0, data0);
|
|
||||||
*v1 = _mm_xor_si128(*v1, data1);
|
|
||||||
while (aligned_buf < end) {
|
|
||||||
*v1 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(*v0, vfold16, 0x00)); \
|
|
||||||
*v0 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(*v0, vfold16, 0x11));
|
|
||||||
*v1 = _mm_load_si128(aligned_buf++);
|
|
||||||
}
|
|
||||||
|
|
||||||
if (aligned_buf != end) {
|
|
||||||
MASK_H(*v0, mask_end, v2)
|
|
||||||
MASK_L(*v0, mask_end, *v0)
|
|
||||||
MASK_L(*v1, mask_end, v3)
|
|
||||||
*v1 = _mm_or_si128(v2, v3);
|
|
||||||
}
|
|
||||||
*v1 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(*v0, vfold16, 0x00));
|
|
||||||
*v0 = _mm_xor_si128(*v1, _mm_clmulepi64_si128(*v0, vfold16, 0x11));
|
|
||||||
|
|
||||||
*v1 = _mm_srli_si128(*v0, 8);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue