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webrtc / src / f8e5c110ee806992f4092220339939fe5c2d3cc9 / . / third_party / zlib / patches / 0001-simd.patch
blob: 1fbf1956f66f7ca558de22f3c5292a7038914ed3 [file] [log] [blame]
diff --git a/crc32.c b/crc32.c
index 9580440c0e6b..9162429cc7b4 100644
--- a/crc32.c
+++ b/crc32.c
@@ -28,6 +28,8 @@
# endif /* !DYNAMIC_CRC_TABLE */
#endif /* MAKECRCH */
+#include "deflate.h"
+#include "x86.h"
#include "zutil.h" /* for STDC and FAR definitions */
/* Definitions for doing the crc four data bytes at a time. */
@@ -440,3 +442,28 @@ uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
{
return crc32_combine_(crc1, crc2, len2);
}
+
+ZLIB_INTERNAL void crc_reset(deflate_state *const s)
+{
+ if (x86_cpu_enable_simd) {
+ crc_fold_init(s);
+ return;
+ }
+ s->strm->adler = crc32(0L, Z_NULL, 0);
+}
+
+ZLIB_INTERNAL void crc_finalize(deflate_state *const s)
+{
+ if (x86_cpu_enable_simd)
+ s->strm->adler = crc_fold_512to32(s);
+}
+
+ZLIB_INTERNAL void copy_with_crc(z_streamp strm, Bytef *dst, long size)
+{
+ if (x86_cpu_enable_simd) {
+ crc_fold_copy(strm->state, dst, strm->next_in, size);
+ return;
+ }
+ zmemcpy(dst, strm->next_in, size);
+ strm->adler = crc32(strm->adler, dst, size);
+}
diff --git a/crc_folding.c b/crc_folding.c
new file mode 100644
index 000000000000..48d77744aaf4
--- /dev/null
+++ b/crc_folding.c
@@ -0,0 +1,493 @@
+/*
+ * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ
+ * instruction.
+ *
+ * A white paper describing this algorithm can be found at:
+ * http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
+ *
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
+ * Authors:
+ * Wajdi Feghali <wajdi.k.feghali@intel.com>
+ * Jim Guilford <james.guilford@intel.com>
+ * Vinodh Gopal <vinodh.gopal@intel.com>
+ * Erdinc Ozturk <erdinc.ozturk@intel.com>
+ * Jim Kukunas <james.t.kukunas@linux.intel.com>
+ *
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "deflate.h"
+
+#include <inttypes.h>
+#include <emmintrin.h>
+#include <immintrin.h>
+#include <wmmintrin.h>
+
+#define CRC_LOAD(s) \
+ do { \
+ __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
+ __m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\
+ __m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\
+ __m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\
+ __m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4);
+
+#define CRC_SAVE(s) \
+ _mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\
+ _mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\
+ _mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\
+ _mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\
+ _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
+ } while (0);
+
+ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
+{
+ CRC_LOAD(s)
+
+ xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
+ xmm_crc1 = _mm_setzero_si128();
+ xmm_crc2 = _mm_setzero_si128();
+ xmm_crc3 = _mm_setzero_si128();
+
+ CRC_SAVE(s)
+
+ s->strm->adler = 0;
+}
+
+local void fold_1(deflate_state *const s,
+ __m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3)
+{
+ const __m128i xmm_fold4 = _mm_set_epi32(
+ 0x00000001, 0x54442bd4,
+ 0x00000001, 0xc6e41596);
+
+ __m128i x_tmp3;
+ __m128 ps_crc0, ps_crc3, ps_res;
+
+ x_tmp3 = *xmm_crc3;
+
+ *xmm_crc3 = *xmm_crc0;
+ *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
+ *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
+ ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
+ ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
+ ps_res = _mm_xor_ps(ps_crc0, ps_crc3);
+
+ *xmm_crc0 = *xmm_crc1;
+ *xmm_crc1 = *xmm_crc2;
+ *xmm_crc2 = x_tmp3;
+ *xmm_crc3 = _mm_castps_si128(ps_res);
+}
+
+local void fold_2(deflate_state *const s,
+ __m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3)
+{
+ const __m128i xmm_fold4 = _mm_set_epi32(
+ 0x00000001, 0x54442bd4,
+ 0x00000001, 0xc6e41596);
+
+ __m128i x_tmp3, x_tmp2;
+ __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20;
+
+ x_tmp3 = *xmm_crc3;
+ x_tmp2 = *xmm_crc2;
+
+ *xmm_crc3 = *xmm_crc1;
+ *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
+ *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
+ ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
+ ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
+ ps_res31= _mm_xor_ps(ps_crc3, ps_crc1);
+
+ *xmm_crc2 = *xmm_crc0;
+ *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
+ *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
+ ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
+ ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
+ ps_res20= _mm_xor_ps(ps_crc0, ps_crc2);
+
+ *xmm_crc0 = x_tmp2;
+ *xmm_crc1 = x_tmp3;
+ *xmm_crc2 = _mm_castps_si128(ps_res20);
+ *xmm_crc3 = _mm_castps_si128(ps_res31);
+}
+
+local void fold_3(deflate_state *const s,
+ __m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3)
+{
+ const __m128i xmm_fold4 = _mm_set_epi32(
+ 0x00000001, 0x54442bd4,
+ 0x00000001, 0xc6e41596);
+
+ __m128i x_tmp3;
+ __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10;
+
+ x_tmp3 = *xmm_crc3;
+
+ *xmm_crc3 = *xmm_crc2;
+ *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
+ *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10);
+ ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
+ ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
+ ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3);
+
+ *xmm_crc2 = *xmm_crc1;
+ *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
+ *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10);
+ ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
+ ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
+ ps_res21= _mm_xor_ps(ps_crc1, ps_crc2);
+
+ *xmm_crc1 = *xmm_crc0;
+ *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
+ *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x10);
+ ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
+ ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
+ ps_res10= _mm_xor_ps(ps_crc0, ps_crc1);
+
+ *xmm_crc0 = x_tmp3;
+ *xmm_crc1 = _mm_castps_si128(ps_res10);
+ *xmm_crc2 = _mm_castps_si128(ps_res21);
+ *xmm_crc3 = _mm_castps_si128(ps_res32);
+}
+
+local void fold_4(deflate_state *const s,
+ __m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3)
+{
+ const __m128i xmm_fold4 = _mm_set_epi32(
+ 0x00000001, 0x54442bd4,
+ 0x00000001, 0xc6e41596);
+
+ __m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3;
+ __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3;
+ __m128 ps_t0, ps_t1, ps_t2, ps_t3;
+ __m128 ps_res0, ps_res1, ps_res2, ps_res3;
+
+ x_tmp0 = *xmm_crc0;
+ x_tmp1 = *xmm_crc1;
+ x_tmp2 = *xmm_crc2;
+ x_tmp3 = *xmm_crc3;
+
+ *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01);
+ x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10);
+ ps_crc0 = _mm_castsi128_ps(*xmm_crc0);
+ ps_t0 = _mm_castsi128_ps(x_tmp0);
+ ps_res0 = _mm_xor_ps(ps_crc0, ps_t0);
+
+ *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01);
+ x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10);
+ ps_crc1 = _mm_castsi128_ps(*xmm_crc1);
+ ps_t1 = _mm_castsi128_ps(x_tmp1);
+ ps_res1 = _mm_xor_ps(ps_crc1, ps_t1);
+
+ *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01);
+ x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10);
+ ps_crc2 = _mm_castsi128_ps(*xmm_crc2);
+ ps_t2 = _mm_castsi128_ps(x_tmp2);
+ ps_res2 = _mm_xor_ps(ps_crc2, ps_t2);
+
+ *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x01);
+ x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10);
+ ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
+ ps_t3 = _mm_castsi128_ps(x_tmp3);
+ ps_res3 = _mm_xor_ps(ps_crc3, ps_t3);
+
+ *xmm_crc0 = _mm_castps_si128(ps_res0);
+ *xmm_crc1 = _mm_castps_si128(ps_res1);
+ *xmm_crc2 = _mm_castps_si128(ps_res2);
+ *xmm_crc3 = _mm_castps_si128(ps_res3);
+}
+
+local const unsigned zalign(32) pshufb_shf_table[60] = {
+ 0x84838281,0x88878685,0x8c8b8a89,0x008f8e8d, /* shl 15 (16 - 1)/shr1 */
+ 0x85848382,0x89888786,0x8d8c8b8a,0x01008f8e, /* shl 14 (16 - 3)/shr2 */
+ 0x86858483,0x8a898887,0x8e8d8c8b,0x0201008f, /* shl 13 (16 - 4)/shr3 */
+ 0x87868584,0x8b8a8988,0x8f8e8d8c,0x03020100, /* shl 12 (16 - 4)/shr4 */
+ 0x88878685,0x8c8b8a89,0x008f8e8d,0x04030201, /* shl 11 (16 - 5)/shr5 */
+ 0x89888786,0x8d8c8b8a,0x01008f8e,0x05040302, /* shl 10 (16 - 6)/shr6 */
+ 0x8a898887,0x8e8d8c8b,0x0201008f,0x06050403, /* shl 9 (16 - 7)/shr7 */
+ 0x8b8a8988,0x8f8e8d8c,0x03020100,0x07060504, /* shl 8 (16 - 8)/shr8 */
+ 0x8c8b8a89,0x008f8e8d,0x04030201,0x08070605, /* shl 7 (16 - 9)/shr9 */
+ 0x8d8c8b8a,0x01008f8e,0x05040302,0x09080706, /* shl 6 (16 -10)/shr10*/
+ 0x8e8d8c8b,0x0201008f,0x06050403,0x0a090807, /* shl 5 (16 -11)/shr11*/
+ 0x8f8e8d8c,0x03020100,0x07060504,0x0b0a0908, /* shl 4 (16 -12)/shr12*/
+ 0x008f8e8d,0x04030201,0x08070605,0x0c0b0a09, /* shl 3 (16 -13)/shr13*/
+ 0x01008f8e,0x05040302,0x09080706,0x0d0c0b0a, /* shl 2 (16 -14)/shr14*/
+ 0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b /* shl 1 (16 -15)/shr15*/
+};
+
+local void partial_fold(deflate_state *const s, const size_t len,
+ __m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3,
+ __m128i *xmm_crc_part)
+{
+
+ const __m128i xmm_fold4 = _mm_set_epi32(
+ 0x00000001, 0x54442bd4,
+ 0x00000001, 0xc6e41596);
+ const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080);
+
+ __m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3;
+ __m128i xmm_a0_0, xmm_a0_1;
+ __m128 ps_crc3, psa0_0, psa0_1, ps_res;
+
+ xmm_shl = _mm_load_si128((__m128i *)pshufb_shf_table + (len - 1));
+ xmm_shr = xmm_shl;
+ xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3);
+
+ xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl);
+
+ *xmm_crc0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shr);
+ xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl);
+ *xmm_crc0 = _mm_or_si128(*xmm_crc0, xmm_tmp1);
+
+ *xmm_crc1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shr);
+ xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl);
+ *xmm_crc1 = _mm_or_si128(*xmm_crc1, xmm_tmp2);
+
+ *xmm_crc2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shr);
+ xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl);
+ *xmm_crc2 = _mm_or_si128(*xmm_crc2, xmm_tmp3);
+
+ *xmm_crc3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shr);
+ *xmm_crc_part = _mm_shuffle_epi8(*xmm_crc_part, xmm_shl);
+ *xmm_crc3 = _mm_or_si128(*xmm_crc3, *xmm_crc_part);
+
+ xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10);
+ xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01);
+
+ ps_crc3 = _mm_castsi128_ps(*xmm_crc3);
+ psa0_0 = _mm_castsi128_ps(xmm_a0_0);
+ psa0_1 = _mm_castsi128_ps(xmm_a0_1);
+
+ ps_res = _mm_xor_ps(ps_crc3, psa0_0);
+ ps_res = _mm_xor_ps(ps_res, psa0_1);
+
+ *xmm_crc3 = _mm_castps_si128(ps_res);
+}
+
+ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s,
+ unsigned char *dst, const unsigned char *src, long len)
+{
+ unsigned long algn_diff;
+ __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
+
+ CRC_LOAD(s)
+
+ if (len < 16) {
+ if (len == 0)
+ return;
+ goto partial;
+ }
+
+ algn_diff = 0 - (uintptr_t)src & 0xF;
+ if (algn_diff) {
+ xmm_crc_part = _mm_loadu_si128((__m128i *)src);
+ _mm_storeu_si128((__m128i *)dst, xmm_crc_part);
+
+ dst += algn_diff;
+ src += algn_diff;
+ len -= algn_diff;
+
+ partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
+ &xmm_crc_part);
+ }
+
+ while ((len -= 64) >= 0) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+ xmm_t2 = _mm_load_si128((__m128i *)src + 2);
+ xmm_t3 = _mm_load_si128((__m128i *)src + 3);
+
+ fold_4(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ _mm_storeu_si128((__m128i *)dst, xmm_t0);
+ _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
+ _mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
+ _mm_storeu_si128((__m128i *)dst + 3, xmm_t3);
+
+ xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
+ xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);
+
+ src += 64;
+ dst += 64;
+ }
+
+ /*
+ * len = num bytes left - 64
+ */
+ if (len + 16 >= 0) {
+ len += 16;
+
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+ xmm_t2 = _mm_load_si128((__m128i *)src + 2);
+
+ fold_3(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ _mm_storeu_si128((__m128i *)dst, xmm_t0);
+ _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
+ _mm_storeu_si128((__m128i *)dst + 2, xmm_t2);
+
+ xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);
+
+ if (len == 0)
+ goto done;
+
+ dst += 48;
+ src += 48;
+ } else if (len + 32 >= 0) {
+ len += 32;
+
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+
+ fold_2(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ _mm_storeu_si128((__m128i *)dst, xmm_t0);
+ _mm_storeu_si128((__m128i *)dst + 1, xmm_t1);
+
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);
+
+ if (len == 0)
+ goto done;
+
+ dst += 32;
+ src += 32;
+ } else if (len + 48 >= 0) {
+ len += 48;
+
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+
+ fold_1(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ _mm_storeu_si128((__m128i *)dst, xmm_t0);
+
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+
+ if (len == 0)
+ goto done;
+
+ dst += 16;
+ src += 16;
+ } else {
+ len += 64;
+ if (len == 0)
+ goto done;
+ }
+
+partial:
+
+#if defined(_MSC_VER)
+ /* VS does not permit the use of _mm_set_epi64x in 32-bit builds */
+ {
+ int32_t parts[4] = {0, 0, 0, 0};
+ memcpy(&parts, src, len);
+ xmm_crc_part = _mm_set_epi32(parts[3], parts[2], parts[1], parts[0]);
+ }
+#else
+ {
+ int64_t parts[2] = {0, 0};
+ memcpy(&parts, src, len);
+ xmm_crc_part = _mm_set_epi64x(parts[1], parts[0]);
+ }
+#endif
+
+ _mm_storeu_si128((__m128i *)dst, xmm_crc_part);
+ partial_fold(s, len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
+ &xmm_crc_part);
+done:
+ CRC_SAVE(s)
+}
+
+local const unsigned zalign(16) crc_k[] = {
+ 0xccaa009e, 0x00000000, /* rk1 */
+ 0x751997d0, 0x00000001, /* rk2 */
+ 0xccaa009e, 0x00000000, /* rk5 */
+ 0x63cd6124, 0x00000001, /* rk6 */
+ 0xf7011640, 0x00000001, /* rk7 */
+ 0xdb710640, 0x00000001 /* rk8 */
+};
+
+local const unsigned zalign(16) crc_mask[4] = {
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000
+};
+
+local const unsigned zalign(16) crc_mask2[4] = {
+ 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
+};
+
+unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s)
+{
+ const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask);
+ const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);
+
+ unsigned crc;
+ __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
+
+ CRC_LOAD(s)
+
+ /*
+ * k1
+ */
+ crc_fold = _mm_load_si128((__m128i *)crc_k);
+
+ x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
+ xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
+ xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
+ xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);
+
+ x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
+ xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);
+
+ x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
+ xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+
+ /*
+ * k5
+ */
+ crc_fold = _mm_load_si128((__m128i *)crc_k + 1);
+
+ xmm_crc0 = xmm_crc3;
+ xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
+ xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
+
+ xmm_crc0 = xmm_crc3;
+ xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
+ xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
+ xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);
+
+ /*
+ * k7
+ */
+ xmm_crc1 = xmm_crc3;
+ xmm_crc2 = xmm_crc3;
+ crc_fold = _mm_load_si128((__m128i *)crc_k + 2);
+
+ xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+ xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);
+
+ xmm_crc2 = xmm_crc3;
+ xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);
+
+ crc = _mm_extract_epi32(xmm_crc3, 2);
+ return ~crc;
+ CRC_SAVE(s)
+}
diff --git a/deflate.c b/deflate.c
index 1ec761448de9..aa0c9c67a6dc 100644
--- a/deflate.c
+++ b/deflate.c
@@ -48,8 +48,9 @@
*/
/* @(#) $Id$ */
-
+#include <assert.h>
#include "deflate.h"
+#include "x86.h"
const char deflate_copyright[] =
" deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
@@ -86,7 +87,7 @@ local block_state deflate_huff OF((deflate_state *s, int flush));
local void lm_init OF((deflate_state *s));
local void putShortMSB OF((deflate_state *s, uInt b));
local void flush_pending OF((z_streamp strm));
-local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
+unsigned ZLIB_INTERNAL deflate_read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
#ifdef ASMV
# pragma message("Assembler code may have bugs -- use at your own risk")
void match_init OF((void)); /* asm code initialization */
@@ -100,6 +101,20 @@ local void check_match OF((deflate_state *s, IPos start, IPos match,
int length));
#endif
+/* From crc32.c */
+extern void ZLIB_INTERNAL crc_reset(deflate_state *const s);
+extern void ZLIB_INTERNAL crc_finalize(deflate_state *const s);
+extern void ZLIB_INTERNAL copy_with_crc(z_streamp strm, Bytef *dst, long size);
+
+#ifdef _MSC_VER
+#define INLINE __inline
+#else
+#define INLINE inline
+#endif
+
+/* Inline optimisation */
+local INLINE Pos insert_string_sse(deflate_state *const s, const Pos str);
+
/* ===========================================================================
* Local data
*/
@@ -162,7 +177,6 @@ local const config configuration_table[10] = {
*/
#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
-
/* ===========================================================================
* Insert string str in the dictionary and set match_head to the previous head
* of the hash chain (the most recent string with same hash key). Return
@@ -173,17 +187,28 @@ local const config configuration_table[10] = {
* characters and the first MIN_MATCH bytes of str are valid (except for
* the last MIN_MATCH-1 bytes of the input file).
*/
+local INLINE Pos insert_string_c(deflate_state *const s, const Pos str)
+{
+ Pos ret;
+
+ UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]);
#ifdef FASTEST
-#define INSERT_STRING(s, str, match_head) \
- (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
- match_head = s->head[s->ins_h], \
- s->head[s->ins_h] = (Pos)(str))
+ ret = s->head[s->ins_h];
#else
-#define INSERT_STRING(s, str, match_head) \
- (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
- match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
- s->head[s->ins_h] = (Pos)(str))
+ ret = s->prev[str & s->w_mask] = s->head[s->ins_h];
#endif
+ s->head[s->ins_h] = str;
+
+ return ret;
+}
+
+local INLINE Pos insert_string(deflate_state *const s, const Pos str)
+{
+ if (x86_cpu_enable_simd)
+ return insert_string_sse(s, str);
+ return insert_string_c(s, str);
+}
+
/* ===========================================================================
* Initialize the hash table (avoiding 64K overflow for 16 bit systems).
@@ -248,6 +273,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
const char *version;
int stream_size;
{
+ unsigned window_padding = 8;
deflate_state *s;
int wrap = 1;
static const char my_version[] = ZLIB_VERSION;
@@ -257,6 +283,8 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
* output size for (length,distance) codes is <= 24 bits.
*/
+ x86_check_features();
+
if (version == Z_NULL || version[0] != my_version[0] ||
stream_size != sizeof(z_stream)) {
return Z_VERSION_ERROR;
@@ -313,12 +341,19 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
s->w_size = 1 << s->w_bits;
s->w_mask = s->w_size - 1;
- s->hash_bits = (uInt)memLevel + 7;
+ if (x86_cpu_enable_simd) {
+ s->hash_bits = 15;
+ } else {
+ s->hash_bits = memLevel + 7;
+ }
+
s->hash_size = 1 << s->hash_bits;
s->hash_mask = s->hash_size - 1;
s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
- s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
+ s->window = (Bytef *) ZALLOC(strm,
+ s->w_size + window_padding,
+ 2*sizeof(Byte));
s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
@@ -418,11 +453,7 @@ int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
str = s->strstart;
n = s->lookahead - (MIN_MATCH-1);
do {
- UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
-#ifndef FASTEST
- s->prev[str & s->w_mask] = s->head[s->ins_h];
-#endif
- s->head[s->ins_h] = (Pos)str;
+ insert_string(s, str);
str++;
} while (--n);
s->strstart = str;
@@ -848,7 +879,7 @@ int ZEXPORT deflate (strm, flush)
#ifdef GZIP
if (s->status == GZIP_STATE) {
/* gzip header */
- strm->adler = crc32(0L, Z_NULL, 0);
+ crc_reset(s);
put_byte(s, 31);
put_byte(s, 139);
put_byte(s, 8);
@@ -1049,6 +1080,7 @@ int ZEXPORT deflate (strm, flush)
/* Write the trailer */
#ifdef GZIP
if (s->wrap == 2) {
+ crc_finalize(s);
put_byte(s, (Byte)(strm->adler & 0xff));
put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
@@ -1161,7 +1193,7 @@ int ZEXPORT deflateCopy (dest, source)
* allocating a large strm->next_in buffer and copying from it.
* (See also flush_pending()).
*/
-local unsigned read_buf(strm, buf, size)
+ZLIB_INTERNAL unsigned deflate_read_buf(strm, buf, size)
z_streamp strm;
Bytef *buf;
unsigned size;
@@ -1173,15 +1205,16 @@ local unsigned read_buf(strm, buf, size)
strm->avail_in -= len;
- zmemcpy(buf, strm->next_in, len);
- if (strm->state->wrap == 1) {
- strm->adler = adler32(strm->adler, buf, len);
- }
#ifdef GZIP
- else if (strm->state->wrap == 2) {
- strm->adler = crc32(strm->adler, buf, len);
- }
+ if (strm->state->wrap == 2)
+ copy_with_crc(strm, buf, len);
+ else
#endif
+ {
+ zmemcpy(buf, strm->next_in, len);
+ if (strm->state->wrap == 1)
+ strm->adler = adler32(strm->adler, buf, len);
+ }
strm->next_in += len;
strm->total_in += len;
@@ -1479,7 +1512,19 @@ local void check_match(s, start, match, length)
* performed for at least two bytes (required for the zip translate_eol
* option -- not supported here).
*/
-local void fill_window(s)
+local void fill_window_c(deflate_state *s);
+
+local void fill_window(deflate_state *s)
+{
+ if (x86_cpu_enable_simd) {
+ fill_window_sse(s);
+ return;
+ }
+
+ fill_window_c(s);
+}
+
+local void fill_window_c(s)
deflate_state *s;
{
unsigned n;
@@ -1847,7 +1892,7 @@ local block_state deflate_fast(s, flush)
*/
hash_head = NIL;
if (s->lookahead >= MIN_MATCH) {
- INSERT_STRING(s, s->strstart, hash_head);
+ hash_head = insert_string(s, s->strstart);
}
/* Find the longest match, discarding those <= prev_length.
@@ -1878,7 +1923,7 @@ local block_state deflate_fast(s, flush)
s->match_length--; /* string at strstart already in table */
do {
s->strstart++;
- INSERT_STRING(s, s->strstart, hash_head);
+ hash_head = insert_string(s, s->strstart);
/* strstart never exceeds WSIZE-MAX_MATCH, so there are
* always MIN_MATCH bytes ahead.
*/
@@ -1950,7 +1995,7 @@ local block_state deflate_slow(s, flush)
*/
hash_head = NIL;
if (s->lookahead >= MIN_MATCH) {
- INSERT_STRING(s, s->strstart, hash_head);
+ hash_head = insert_string(s, s->strstart);
}
/* Find the longest match, discarding those <= prev_length.
@@ -2001,7 +2046,7 @@ local block_state deflate_slow(s, flush)
s->prev_length -= 2;
do {
if (++s->strstart <= max_insert) {
- INSERT_STRING(s, s->strstart, hash_head);
+ hash_head = insert_string(s, s->strstart);
}
} while (--s->prev_length != 0);
s->match_available = 0;
@@ -2161,3 +2206,37 @@ local block_state deflate_huff(s, flush)
FLUSH_BLOCK(s, 0);
return block_done;
}
+
+/* Safe to inline this as GCC/clang will use inline asm and Visual Studio will
+ * use intrinsic without extra params
+ */
+local INLINE Pos insert_string_sse(deflate_state *const s, const Pos str)
+{
+ Pos ret;
+ unsigned *ip, val, h = 0;
+
+ ip = (unsigned *)&s->window[str];
+ val = *ip;
+
+ if (s->level >= 6)
+ val &= 0xFFFFFF;
+
+/* Windows clang should use inline asm */
+#if defined(_MSC_VER) && !defined(__clang__)
+ h = _mm_crc32_u32(h, val);
+#elif defined(__i386__) || defined(__amd64__)
+ __asm__ __volatile__ (
+ "crc32 %1,%0\n\t"
+ : "+r" (h)
+ : "r" (val)
+ );
+#else
+ /* This should never happen */
+ assert(0);
+#endif
+
+ ret = s->head[h & s->hash_mask];
+ s->head[h & s->hash_mask] = str;
+ s->prev[str & s->w_mask] = ret;
+ return ret;
+}
diff --git a/deflate.h b/deflate.h
index 23ecdd312bc0..ab56df7663b6 100644
--- a/deflate.h
+++ b/deflate.h
@@ -109,7 +109,7 @@ typedef struct internal_state {
ulg gzindex; /* where in extra, name, or comment */
Byte method; /* can only be DEFLATED */
int last_flush; /* value of flush param for previous deflate call */
-
+ unsigned zalign(16) crc0[4 * 5];
/* used by deflate.c: */
uInt w_size; /* LZ77 window size (32K by default) */
@@ -346,4 +346,14 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
flush = _tr_tally(s, distance, length)
#endif
+/* Functions that are SIMD optimised on x86 */
+void ZLIB_INTERNAL crc_fold_init(deflate_state* const s);
+void ZLIB_INTERNAL crc_fold_copy(deflate_state* const s,
+ unsigned char* dst,
+ const unsigned char* src,
+ long len);
+unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state* const s);
+
+void ZLIB_INTERNAL fill_window_sse(deflate_state* s);
+
#endif /* DEFLATE_H */
diff --git a/fill_window_sse.c b/fill_window_sse.c
new file mode 100644
index 000000000000..949ccce1ba9c
--- /dev/null
+++ b/fill_window_sse.c
@@ -0,0 +1,177 @@
+/*
+ * Fill Window with SSE2-optimized hash shifting
+ *
+ * Copyright (C) 2013 Intel Corporation
+ * Authors:
+ * Arjan van de Ven <arjan@linux.intel.com>
+ * Jim Kukunas <james.t.kukunas@linux.intel.com>
+ *
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include <immintrin.h>
+#include "deflate.h"
+
+#define UPDATE_HASH(s,h,i) \
+ {\
+ if (s->level < 6) { \
+ h = (3483 * (s->window[i]) +\
+ 23081* (s->window[i+1]) +\
+ 6954 * (s->window[i+2]) +\
+ 20947* (s->window[i+3])) & s->hash_mask;\
+ } else {\
+ h = (25881* (s->window[i]) +\
+ 24674* (s->window[i+1]) +\
+ 25811* (s->window[i+2])) & s->hash_mask;\
+ }\
+ }\
+
+extern int deflate_read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
+
+void fill_window_sse(deflate_state *s)
+{
+ const __m128i xmm_wsize = _mm_set1_epi16(s->w_size);
+
+ register unsigned n;
+ register Posf *p;
+ unsigned more; /* Amount of free space at the end of the window. */
+ uInt wsize = s->w_size;
+
+ Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
+
+ do {
+ more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
+
+ /* Deal with !@#$% 64K limit: */
+ if (sizeof(int) <= 2) {
+ if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
+ more = wsize;
+
+ } else if (more == (unsigned)(-1)) {
+ /* Very unlikely, but possible on 16 bit machine if
+ * strstart == 0 && lookahead == 1 (input done a byte at time)
+ */
+ more--;
+ }
+ }
+
+ /* If the window is almost full and there is insufficient lookahead,
+ * move the upper half to the lower one to make room in the upper half.
+ */
+ if (s->strstart >= wsize+MAX_DIST(s)) {
+
+ zmemcpy(s->window, s->window+wsize, (unsigned)wsize);
+ s->match_start -= wsize;
+ s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
+ s->block_start -= (long) wsize;
+
+ /* Slide the hash table (could be avoided with 32 bit values
+ at the expense of memory usage). We slide even when level == 0
+ to keep the hash table consistent if we switch back to level > 0
+ later. (Using level 0 permanently is not an optimal usage of
+ zlib, so we don't care about this pathological case.)
+ */
+ n = s->hash_size;
+ p = &s->head[n];
+ p -= 8;
+ do {
+ __m128i value, result;
+
+ value = _mm_loadu_si128((__m128i *)p);
+ result = _mm_subs_epu16(value, xmm_wsize);
+ _mm_storeu_si128((__m128i *)p, result);
+
+ p -= 8;
+ n -= 8;
+ } while (n > 0);
+
+ n = wsize;
+#ifndef FASTEST
+ p = &s->prev[n];
+ p -= 8;
+ do {
+ __m128i value, result;
+
+ value = _mm_loadu_si128((__m128i *)p);
+ result = _mm_subs_epu16(value, xmm_wsize);
+ _mm_storeu_si128((__m128i *)p, result);
+
+ p -= 8;
+ n -= 8;
+ } while (n > 0);
+#endif
+ more += wsize;
+ }
+ if (s->strm->avail_in == 0) break;
+
+ /* If there was no sliding:
+ * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
+ * more == window_size - lookahead - strstart
+ * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
+ * => more >= window_size - 2*WSIZE + 2
+ * In the BIG_MEM or MMAP case (not yet supported),
+ * window_size == input_size + MIN_LOOKAHEAD &&
+ * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
+ * Otherwise, window_size == 2*WSIZE so more >= 2.
+ * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
+ */
+ Assert(more >= 2, "more < 2");
+
+ n = deflate_read_buf(s->strm,
+ s->window + s->strstart + s->lookahead,
+ more);
+ s->lookahead += n;
+
+ /* Initialize the hash value now that we have some input: */
+ if (s->lookahead >= MIN_MATCH) {
+ uInt str = s->strstart;
+ s->ins_h = s->window[str];
+ if (str >= 1)
+ UPDATE_HASH(s, s->ins_h, str + 1 - (MIN_MATCH-1));
+#if MIN_MATCH != 3
+ Call UPDATE_HASH() MIN_MATCH-3 more times
+#endif
+ }
+ /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
+ * but this is not important since only literal bytes will be emitted.
+ */
+
+ } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
+
+ /* If the WIN_INIT bytes after the end of the current data have never been
+ * written, then zero those bytes in order to avoid memory check reports of
+ * the use of uninitialized (or uninitialised as Julian writes) bytes by
+ * the longest match routines. Update the high water mark for the next
+ * time through here. WIN_INIT is set to MAX_MATCH since the longest match
+ * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
+ */
+ if (s->high_water < s->window_size) {
+ ulg curr = s->strstart + (ulg)(s->lookahead);
+ ulg init;
+
+ if (s->high_water < curr) {
+ /* Previous high water mark below current data -- zero WIN_INIT
+ * bytes or up to end of window, whichever is less.
+ */
+ init = s->window_size - curr;
+ if (init > WIN_INIT)
+ init = WIN_INIT;
+ zmemzero(s->window + curr, (unsigned)init);
+ s->high_water = curr + init;
+ }
+ else if (s->high_water < (ulg)curr + WIN_INIT) {
+ /* High water mark at or above current data, but below current data
+ * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
+ * to end of window, whichever is less.
+ */
+ init = (ulg)curr + WIN_INIT - s->high_water;
+ if (init > s->window_size - s->high_water)
+ init = s->window_size - s->high_water;
+ zmemzero(s->window + s->high_water, (unsigned)init);
+ s->high_water += init;
+ }
+ }
+
+ Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
+ "not enough room for search");
+}
diff --git a/names.h b/names.h
index f18df5684dc5..3436baa4eb57 100644
--- a/names.h
+++ b/names.h
@@ -152,4 +152,16 @@
/* An exported symbol that isn't handled by Z_PREFIX in zconf.h */
#define z_errmsg Cr_z_z_errmsg
+/* Symbols added in simd.patch */
+#define copy_with_crc Cr_z_copy_with_crc
+#define crc_finalize Cr_z_crc_finalize
+#define crc_fold_512to32 Cr_z_crc_fold_512to32
+#define crc_fold_copy Cr_z_crc_fold_copy
+#define crc_fold_init Cr_z_crc_fold_init
+#define crc_reset Cr_z_crc_reset
+#define fill_window_sse Cr_z_fill_window_sse
+#define deflate_read_buf Cr_z_deflate_read_buf
+#define x86_check_features Cr_z_x86_check_features
+#define x86_cpu_enable_simd Cr_z_x86_cpu_enable_simd
+
#endif /* THIRD_PARTY_ZLIB_NAMES_H_ */
diff --git a/simd_stub.c b/simd_stub.c
new file mode 100644
index 000000000000..c6d46051498f
--- /dev/null
+++ b/simd_stub.c
@@ -0,0 +1,35 @@
+/* simd_stub.c -- stub implementations
+* Copyright (C) 2014 Intel Corporation
+* For conditions of distribution and use, see copyright notice in zlib.h
+*/
+#include <assert.h>
+
+#include "deflate.h"
+#include "x86.h"
+
+int ZLIB_INTERNAL x86_cpu_enable_simd = 0;
+
+void ZLIB_INTERNAL crc_fold_init(deflate_state *const s) {
+ assert(0);
+}
+
+void ZLIB_INTERNAL crc_fold_copy(deflate_state *const s,
+ unsigned char *dst,
+ const unsigned char *src,
+ long len) {
+ assert(0);
+}
+
+unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s) {
+ assert(0);
+ return 0;
+}
+
+void ZLIB_INTERNAL fill_window_sse(deflate_state *s)
+{
+ assert(0);
+}
+
+void x86_check_features(void)
+{
+}
diff --git a/x86.c b/x86.c
new file mode 100644
index 000000000000..e56fe8b85a39
--- /dev/null
+++ b/x86.c
@@ -0,0 +1,92 @@
+/*
+ * x86 feature check
+ *
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
+ * Author:
+ * Jim Kukunas
+ *
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "x86.h"
+#include "zutil.h"
+
+int ZLIB_INTERNAL x86_cpu_enable_simd = 0;
+
+#ifndef _MSC_VER
+#include <pthread.h>
+
+pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
+static void _x86_check_features(void);
+
+void x86_check_features(void)
+{
+ pthread_once(&cpu_check_inited_once, _x86_check_features);
+}
+
+static void _x86_check_features(void)
+{
+ int x86_cpu_has_sse2;
+ int x86_cpu_has_sse42;
+ int x86_cpu_has_pclmulqdq;
+ unsigned eax, ebx, ecx, edx;
+
+ eax = 1;
+#ifdef __i386__
+ __asm__ __volatile__ (
+ "xchg %%ebx, %1\n\t"
+ "cpuid\n\t"
+ "xchg %1, %%ebx\n\t"
+ : "+a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx)
+ );
+#else
+ __asm__ __volatile__ (
+ "cpuid\n\t"
+ : "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
+ );
+#endif /* (__i386__) */
+
+ x86_cpu_has_sse2 = edx & 0x4000000;
+ x86_cpu_has_sse42 = ecx & 0x100000;
+ x86_cpu_has_pclmulqdq = ecx & 0x2;
+
+ x86_cpu_enable_simd = x86_cpu_has_sse2 &&
+ x86_cpu_has_sse42 &&
+ x86_cpu_has_pclmulqdq;
+}
+#else
+#include <intrin.h>
+#include <windows.h>
+
+static BOOL CALLBACK _x86_check_features(PINIT_ONCE once,
+ PVOID param,
+ PVOID *context);
+static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT;
+
+void x86_check_features(void)
+{
+ InitOnceExecuteOnce(&cpu_check_inited_once, _x86_check_features,
+ NULL, NULL);
+}
+
+static BOOL CALLBACK _x86_check_features(PINIT_ONCE once,
+ PVOID param,
+ PVOID *context)
+{
+ int x86_cpu_has_sse2;
+ int x86_cpu_has_sse42;
+ int x86_cpu_has_pclmulqdq;
+ int regs[4];
+
+ __cpuid(regs, 1);
+
+ x86_cpu_has_sse2 = regs[3] & 0x4000000;
+ x86_cpu_has_sse42= regs[2] & 0x100000;
+ x86_cpu_has_pclmulqdq = regs[2] & 0x2;
+
+ x86_cpu_enable_simd = x86_cpu_has_sse2 &&
+ x86_cpu_has_sse42 &&
+ x86_cpu_has_pclmulqdq;
+ return TRUE;
+}
+#endif /* _MSC_VER */
diff --git a/x86.h b/x86.h
new file mode 100644
index 000000000000..ebcf10ab09d2
--- /dev/null
+++ b/x86.h
@@ -0,0 +1,15 @@
+/* x86.h -- check for x86 CPU features
+* Copyright (C) 2013 Intel Corporation Jim Kukunas
+* For conditions of distribution and use, see copyright notice in zlib.h
+*/
+
+#ifndef X86_H
+#define X86_H
+
+#include "zlib.h"
+
+extern int x86_cpu_enable_simd;
+
+void x86_check_features(void);
+
+#endif /* X86_H */
diff --git a/zutil.h b/zutil.h
index 80375b8b6109..4425bcf75eb3 100644
--- a/zutil.h
+++ b/zutil.h
@@ -283,4 +283,10 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
#define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
+#ifdef _MSC_VER
+#define zalign(x) __declspec(align(x))
+#else
+#define zalign(x) __attribute__((aligned((x))))
+#endif
+
#endif /* ZUTIL_H */