mirrors/nodejs
mirrors/nodejs
0
0
Fork 0
mirror of https://github.com/nodejs/node.git synced 2024-12-01 16:10:02 +01:00
Code Issues Releases Activity
bea2252554
nodejs/deps/zlib/adler32_simd.c
Anna Henningsen dccdc51788
deps: fix zlib compilation for CPUs without SIMD features 
Fix the compile flags so that zlib can run on CPUs that do
not have SSSE3/SSE4.2/etc. Do not compile zlib with flags that
indicate that those features are available, and instead enable
them selectively for functions that use them.

There are probably better way to do this, e.g. through gyp file
modifications as suggested in the issue. However, this patch
should do just fine until that happens.

Fixes: https://github.com/nodejs/node/issues/32553

PR-URL: https://github.com/nodejs/node/pull/32627
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
2020-04-09 21:41:02 +02:00

371 lines
10 KiB
C
Raw Blame History

/* adler32_simd.c
*
* Copyright 2017 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the Chromium source repository LICENSE file.
*
* Per http://en.wikipedia.org/wiki/Adler-32 the adler32 A value (aka s1) is
* the sum of N input data bytes D1 ... DN,
*
* A = A0 + D1 + D2 + ... + DN
*
* where A0 is the initial value.
*
* SSE2 _mm_sad_epu8() can be used for byte sums (see http://bit.ly/2wpUOeD,
* for example) and accumulating the byte sums can use SSE shuffle-adds (see
* the "Integer" section of http://bit.ly/2erPT8t for details). Arm NEON has
* similar instructions.
*
* The adler32 B value (aka s2) sums the A values from each step:
*
* B0 + (A0 + D1) + (A0 + D1 + D2) + ... + (A0 + D1 + D2 + ... + DN) or
*
* B0 + N.A0 + N.D1 + (N-1).D2 + (N-2).D3 + ... + (N-(N-1)).DN
*
* B0 being the initial value. For 32 bytes (ideal for garden-variety SIMD):
*
* B = B0 + 32.A0 + [D1 D2 D3 ... D32] x [32 31 30 ... 1].
*
* Adjacent blocks of 32 input bytes can be iterated with the expressions to
* compute the adler32 s1 s2 of M >> 32 input bytes [1].
*
* As M grows, the s1 s2 sums grow. If left unchecked, they would eventually
* overflow the precision of their integer representation (bad). However, s1
* and s2 also need to be computed modulo the adler BASE value (reduced). If
* at most NMAX bytes are processed before a reduce, s1 s2 _cannot_ overflow
* a uint32_t type (the NMAX constraint) [2].
*
* [1] the iterative equations for s2 contain constant factors; these can be
* hoisted from the n-blocks do loop of the SIMD code.
*
* [2] zlib adler32_z() uses this fact to implement NMAX-block-based updates
* of the adler s1 s2 of uint32_t type (see adler32.c).
*/
#include "adler32_simd.h"
/* Definitions from adler32.c: largest prime smaller than 65536 */
#define BASE 65521U
/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
#define NMAX 5552
#if defined(ADLER32_SIMD_SSSE3)
#ifndef __GNUC__
#define __attribute__()
#endif
#include <tmmintrin.h>
__attribute__((target("ssse3")))
uint32_t ZLIB_INTERNAL adler32_simd_( /* SSSE3 */
uint32_t adler,
const unsigned char *buf,
z_size_t len)
{
/*
* Split Adler-32 into component sums.
*/
uint32_t s1 = adler & 0xffff;
uint32_t s2 = adler >> 16;
/*
* Process the data in blocks.
*/
const unsigned BLOCK_SIZE = 1 << 5;
z_size_t blocks = len / BLOCK_SIZE;
len -= blocks * BLOCK_SIZE;
while (blocks)
{
unsigned n = NMAX / BLOCK_SIZE; /* The NMAX constraint. */
if (n > blocks)
n = (unsigned) blocks;
blocks -= n;
const __m128i tap1 =
_mm_setr_epi8(32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17);
const __m128i tap2 =
_mm_setr_epi8(16,15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1);
const __m128i zero =
_mm_setr_epi8( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
const __m128i ones =
_mm_set_epi16( 1, 1, 1, 1, 1, 1, 1, 1);
/*
* Process n blocks of data. At most NMAX data bytes can be
* processed before s2 must be reduced modulo BASE.
*/
__m128i v_ps = _mm_set_epi32(0, 0, 0, s1 * n);
__m128i v_s2 = _mm_set_epi32(0, 0, 0, s2);
__m128i v_s1 = _mm_set_epi32(0, 0, 0, 0);
do {
/*
* Load 32 input bytes.
*/
const __m128i bytes1 = _mm_loadu_si128((__m128i*)(buf));
const __m128i bytes2 = _mm_loadu_si128((__m128i*)(buf + 16));
/*
* Add previous block byte sum to v_ps.
*/
v_ps = _mm_add_epi32(v_ps, v_s1);
/*
* Horizontally add the bytes for s1, multiply-adds the
* bytes by [ 32, 31, 30, ... ] for s2.
*/
v_s1 = _mm_add_epi32(v_s1, _mm_sad_epu8(bytes1, zero));
const __m128i mad1 = _mm_maddubs_epi16(bytes1, tap1);
v_s2 = _mm_add_epi32(v_s2, _mm_madd_epi16(mad1, ones));
v_s1 = _mm_add_epi32(v_s1, _mm_sad_epu8(bytes2, zero));
const __m128i mad2 = _mm_maddubs_epi16(bytes2, tap2);
v_s2 = _mm_add_epi32(v_s2, _mm_madd_epi16(mad2, ones));
buf += BLOCK_SIZE;
} while (--n);
v_s2 = _mm_add_epi32(v_s2, _mm_slli_epi32(v_ps, 5));
/*
* Sum epi32 ints v_s1(s2) and accumulate in s1(s2).
*/
#define S23O1 _MM_SHUFFLE(2,3,0,1) /* A B C D -> B A D C */
#define S1O32 _MM_SHUFFLE(1,0,3,2) /* A B C D -> C D A B */
v_s1 = _mm_add_epi32(v_s1, _mm_shuffle_epi32(v_s1, S23O1));
v_s1 = _mm_add_epi32(v_s1, _mm_shuffle_epi32(v_s1, S1O32));
s1 += _mm_cvtsi128_si32(v_s1);
v_s2 = _mm_add_epi32(v_s2, _mm_shuffle_epi32(v_s2, S23O1));
v_s2 = _mm_add_epi32(v_s2, _mm_shuffle_epi32(v_s2, S1O32));
s2 = _mm_cvtsi128_si32(v_s2);
#undef S23O1
#undef S1O32
/*
* Reduce.
*/
s1 %= BASE;
s2 %= BASE;
}
/*
* Handle leftover data.
*/
if (len) {
if (len >= 16) {
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
len -= 16;
}
while (len--) {
s2 += (s1 += *buf++);
}
if (s1 >= BASE)
s1 -= BASE;
s2 %= BASE;
}
/*
* Return the recombined sums.
*/
return s1 | (s2 << 16);
}
#elif defined(ADLER32_SIMD_NEON)
#include <arm_neon.h>
uint32_t ZLIB_INTERNAL adler32_simd_( /* NEON */
uint32_t adler,
const unsigned char *buf,
z_size_t len)
{
/*
* Split Adler-32 into component sums.
*/
uint32_t s1 = adler & 0xffff;
uint32_t s2 = adler >> 16;
/*
* Serially compute s1 & s2, until the data is 16-byte aligned.
*/
if ((uintptr_t)buf & 15) {
while ((uintptr_t)buf & 15) {
s2 += (s1 += *buf++);
--len;
}
if (s1 >= BASE)
s1 -= BASE;
s2 %= BASE;
}
/*
* Process the data in blocks.
*/
const unsigned BLOCK_SIZE = 1 << 5;
z_size_t blocks = len / BLOCK_SIZE;
len -= blocks * BLOCK_SIZE;
while (blocks)
{
unsigned n = NMAX / BLOCK_SIZE; /* The NMAX constraint. */
if (n > blocks)
n = (unsigned) blocks;
blocks -= n;
/*
* Process n blocks of data. At most NMAX data bytes can be
* processed before s2 must be reduced modulo BASE.
*/
uint32x4_t v_s2 = (uint32x4_t) { 0, 0, 0, s1 * n };
uint32x4_t v_s1 = (uint32x4_t) { 0, 0, 0, 0 };
uint16x8_t v_column_sum_1 = vdupq_n_u16(0);
uint16x8_t v_column_sum_2 = vdupq_n_u16(0);
uint16x8_t v_column_sum_3 = vdupq_n_u16(0);
uint16x8_t v_column_sum_4 = vdupq_n_u16(0);
do {
/*
* Load 32 input bytes.
*/
const uint8x16_t bytes1 = vld1q_u8((uint8_t*)(buf));
const uint8x16_t bytes2 = vld1q_u8((uint8_t*)(buf + 16));
/*
* Add previous block byte sum to v_s2.
*/
v_s2 = vaddq_u32(v_s2, v_s1);
/*
* Horizontally add the bytes for s1.
*/
v_s1 = vpadalq_u16(v_s1, vpadalq_u8(vpaddlq_u8(bytes1), bytes2));
/*
* Vertically add the bytes for s2.
*/
v_column_sum_1 = vaddw_u8(v_column_sum_1, vget_low_u8 (bytes1));
v_column_sum_2 = vaddw_u8(v_column_sum_2, vget_high_u8(bytes1));
v_column_sum_3 = vaddw_u8(v_column_sum_3, vget_low_u8 (bytes2));
v_column_sum_4 = vaddw_u8(v_column_sum_4, vget_high_u8(bytes2));
buf += BLOCK_SIZE;
} while (--n);
v_s2 = vshlq_n_u32(v_s2, 5);
/*
* Multiply-add bytes by [ 32, 31, 30, ... ] for s2.
*/
v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_1),
(uint16x4_t) { 32, 31, 30, 29 });
v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_1),
(uint16x4_t) { 28, 27, 26, 25 });
v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_2),
(uint16x4_t) { 24, 23, 22, 21 });
v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_2),
(uint16x4_t) { 20, 19, 18, 17 });
v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_3),
(uint16x4_t) { 16, 15, 14, 13 });
v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_3),
(uint16x4_t) { 12, 11, 10, 9 });
v_s2 = vmlal_u16(v_s2, vget_low_u16 (v_column_sum_4),
(uint16x4_t) { 8, 7, 6, 5 });
v_s2 = vmlal_u16(v_s2, vget_high_u16(v_column_sum_4),
(uint16x4_t) { 4, 3, 2, 1 });
/*
* Sum epi32 ints v_s1(s2) and accumulate in s1(s2).
*/
uint32x2_t sum1 = vpadd_u32(vget_low_u32(v_s1), vget_high_u32(v_s1));
uint32x2_t sum2 = vpadd_u32(vget_low_u32(v_s2), vget_high_u32(v_s2));
uint32x2_t s1s2 = vpadd_u32(sum1, sum2);
s1 += vget_lane_u32(s1s2, 0);
s2 += vget_lane_u32(s1s2, 1);
/*
* Reduce.
*/
s1 %= BASE;
s2 %= BASE;
}
/*
* Handle leftover data.
*/
if (len) {
if (len >= 16) {
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
s2 += (s1 += *buf++);
len -= 16;
}
while (len--) {
s2 += (s1 += *buf++);
}
if (s1 >= BASE)
s1 -= BASE;
s2 %= BASE;
}
/*
* Return the recombined sums.
*/
return s1 | (s2 << 16);
}
#endif /* ADLER32_SIMD_SSSE3 */
View Git Blame Copy Permalink