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Diffstat (limited to 'src/zlib-ng/arch/x86/crc32_fold_pclmulqdq.c')
-rw-r--r--src/zlib-ng/arch/x86/crc32_fold_pclmulqdq.c608
1 files changed, 608 insertions, 0 deletions
diff --git a/src/zlib-ng/arch/x86/crc32_fold_pclmulqdq.c b/src/zlib-ng/arch/x86/crc32_fold_pclmulqdq.c
new file mode 100644
index 0000000..6bb2c98
--- /dev/null
+++ b/src/zlib-ng/arch/x86/crc32_fold_pclmulqdq.c
@@ -0,0 +1,608 @@
+/*
+ * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ
+ * instruction.
+ *
+ * A white paper describing this algorithm can be found at:
+ * https://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.
+ * Copyright (C) 2016 Marian Beermann (support for initial value)
+ * 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
+ */
+
+#ifdef X86_PCLMULQDQ_CRC
+#include "../../zbuild.h"
+
+#include <immintrin.h>
+#include <wmmintrin.h>
+#include <smmintrin.h> // _mm_extract_epi32
+
+#include "x86_features.h"
+#include "cpu_features.h"
+
+#include "../../crc32_fold.h"
+#include "../../crc32_braid_p.h"
+#include <assert.h>
+
+#ifdef X86_VPCLMULQDQ_CRC
+extern size_t fold_16_vpclmulqdq(__m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3, uint8_t *dst, const uint8_t *src, size_t len);
+extern size_t fold_16_vpclmulqdq_nocp(__m128i *xmm_crc0, __m128i *xmm_crc1,
+ __m128i *xmm_crc2, __m128i *xmm_crc3, const uint8_t *src, size_t len, __m128i init_crc,
+ int32_t first);
+#endif
+
+static void fold_1(__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);
+}
+
+static void fold_2(__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);
+}
+
+static void fold_3(__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);
+}
+
+static void fold_4(__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);
+}
+
+static const unsigned ALIGNED_(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*/
+};
+
+static void partial_fold(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((int32_t)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);
+}
+
+static inline void crc32_fold_load(__m128i *fold, __m128i *fold0, __m128i *fold1, __m128i *fold2, __m128i *fold3) {
+ *fold0 = _mm_load_si128(fold + 0);
+ *fold1 = _mm_load_si128(fold + 1);
+ *fold2 = _mm_load_si128(fold + 2);
+ *fold3 = _mm_load_si128(fold + 3);
+}
+
+static inline void crc32_fold_save(__m128i *fold, __m128i fold0, __m128i fold1, __m128i fold2, __m128i fold3) {
+ _mm_storeu_si128(fold + 0, fold0);
+ _mm_storeu_si128(fold + 1, fold1);
+ _mm_storeu_si128(fold + 2, fold2);
+ _mm_storeu_si128(fold + 3, fold3);
+}
+
+static inline void crc32_fold_save_partial(__m128i *fold, __m128i foldp) {
+ _mm_store_si128(fold + 4, foldp);
+}
+
+Z_INTERNAL uint32_t crc32_fold_reset_pclmulqdq(crc32_fold *crc) {
+ __m128i xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
+ __m128i xmm_zero = _mm_setzero_si128();
+ crc32_fold_save((__m128i *)crc->fold, xmm_crc0, xmm_zero, xmm_zero, xmm_zero);
+ return 0;
+}
+
+Z_INTERNAL void crc32_fold_copy_pclmulqdq(crc32_fold *crc, uint8_t *dst, const uint8_t *src, size_t len) {
+ unsigned long algn_diff;
+ __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
+ __m128i xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3, xmm_crc_part;
+ char ALIGNED_(16) partial_buf[16] = { 0 };
+
+ crc32_fold_load((__m128i *)crc->fold, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ if (len < 16) {
+ if (len == 0)
+ return;
+
+ memcpy(partial_buf, src, len);
+ xmm_crc_part = _mm_load_si128((const __m128i *)partial_buf);
+ memcpy(dst, partial_buf, len);
+ goto partial;
+ }
+
+ algn_diff = ((uintptr_t)16 - ((uintptr_t)src & 0xF)) & 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(algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+ } else {
+ xmm_crc_part = _mm_setzero_si128();
+ }
+
+#ifdef X86_VPCLMULQDQ_CRC
+ if (x86_cpu_has_vpclmulqdq && x86_cpu_has_avx512 && (len >= 256)) {
+ size_t n = fold_16_vpclmulqdq(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, dst, src, len);
+
+ len -= n;
+ src += n;
+ dst += n;
+ }
+#endif
+
+ while (len >= 64) {
+ crc32_fold_load((__m128i *)src, &xmm_t0, &xmm_t1, &xmm_t2, &xmm_t3);
+
+ fold_4(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ crc32_fold_save((__m128i *)dst, xmm_t0, xmm_t1, xmm_t2, 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 -= 64;
+ }
+
+ /*
+ * len = num bytes left - 64
+ */
+ if (len >= 48) {
+ 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(&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);
+ len -= 48;
+ if (len == 0)
+ goto done;
+
+ dst += 48;
+ memcpy(&xmm_crc_part, (__m128i *)src + 3, len);
+ } else if (len >= 32) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+
+ fold_2(&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);
+
+ len -= 32;
+ if (len == 0)
+ goto done;
+
+ dst += 32;
+ memcpy(&xmm_crc_part, (__m128i *)src + 2, len);
+ } else if (len >= 16) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+
+ fold_1(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ _mm_storeu_si128((__m128i *)dst, xmm_t0);
+
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+
+ len -= 16;
+ if (len == 0)
+ goto done;
+
+ dst += 16;
+ memcpy(&xmm_crc_part, (__m128i *)src + 1, len);
+ } else {
+ if (len == 0)
+ goto done;
+ memcpy(&xmm_crc_part, src, len);
+ }
+
+ _mm_storeu_si128((__m128i *)partial_buf, xmm_crc_part);
+ memcpy(dst, partial_buf, len);
+
+partial:
+ partial_fold((size_t)len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+done:
+ crc32_fold_save((__m128i *)crc->fold, xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3);
+ crc32_fold_save_partial((__m128i *)crc->fold, xmm_crc_part);
+}
+
+#define ONCE(op) if (first) { \
+ first = 0; \
+ (op); \
+}
+#define XOR_INITIAL(where) ONCE(where = _mm_xor_si128(where, xmm_initial))
+
+Z_INTERNAL void crc32_fold_pclmulqdq(crc32_fold *crc, const uint8_t *src, size_t len, uint32_t init_crc) {
+ unsigned long algn_diff;
+ __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
+ __m128i xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3, xmm_crc_part;
+ __m128i xmm_initial = _mm_cvtsi32_si128(init_crc);
+ xmm_crc_part = _mm_setzero_si128();
+ int32_t first = init_crc != 0;
+
+ /* Technically the CRC functions don't even call this for input < 64, but a bare minimum of 31
+ * bytes of input is needed for the aligning load that occurs. If there's an initial CRC, to
+ * carry it forward through the folded CRC there must be 16 - src % 16 + 16 bytes available, which
+ * by definition can be up to 15 bytes + one full vector load. */
+ assert(len >= 31 || first == 0);
+ crc32_fold_load((__m128i *)crc->fold, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ if (len < 16) {
+ goto partial_nocpy;
+ }
+
+ algn_diff = ((uintptr_t)16 - ((uintptr_t)src & 0xF)) & 0xF;
+ if (algn_diff) {
+ if (algn_diff >= 4 || init_crc == 0) {
+ xmm_crc_part = _mm_loadu_si128((__m128i *)src);
+
+ src += algn_diff;
+ len -= algn_diff;
+
+ XOR_INITIAL(xmm_crc_part);
+ partial_fold(algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+ } else {
+ xmm_t0 = _mm_loadu_si128((__m128i*)src);
+ xmm_crc_part = _mm_loadu_si128((__m128i*)src + 1);
+ XOR_INITIAL(xmm_t0);
+ fold_1(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+ partial_fold(algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+
+ src += (algn_diff + 16);
+ len -= (algn_diff + 16);
+ }
+
+ xmm_crc_part = _mm_setzero_si128();
+ }
+
+#ifdef X86_VPCLMULQDQ_CRC
+ if (x86_cpu_has_vpclmulqdq && x86_cpu_has_avx512 && (len >= 256)) {
+ size_t n = fold_16_vpclmulqdq_nocp(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, src, len,
+ xmm_initial, first);
+ first = 0;
+
+ len -= n;
+ src += n;
+ }
+#endif
+
+ while (len >= 64) {
+ crc32_fold_load((__m128i *)src, &xmm_t0, &xmm_t1, &xmm_t2, &xmm_t3);
+ XOR_INITIAL(xmm_t0);
+ fold_4(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ 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;
+ len -= 64;
+ }
+
+ /*
+ * len = num bytes left - 64
+ */
+ if (len >= 48) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+ xmm_t2 = _mm_load_si128((__m128i *)src + 2);
+ XOR_INITIAL(xmm_t0);
+
+ fold_3(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ 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);
+ len -= 48;
+ src += 48;
+ } else if (len >= 32) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+ XOR_INITIAL(xmm_t0);
+
+ fold_2(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);
+
+ len -= 32;
+ src += 32;
+ } else if (len >= 16) {
+ xmm_t0 = _mm_load_si128((__m128i *)src);
+ XOR_INITIAL(xmm_t0);
+
+ fold_1(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+
+ len -= 16;
+ src += 16;
+ }
+
+partial_nocpy:
+ if (len) {
+ memcpy(&xmm_crc_part, src, len);
+ partial_fold((size_t)len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+ }
+
+ crc32_fold_save((__m128i *)crc->fold, xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3);
+}
+
+static const unsigned ALIGNED_(16) crc_k[] = {
+ 0xccaa009e, 0x00000000, /* rk1 */
+ 0x751997d0, 0x00000001, /* rk2 */
+ 0xccaa009e, 0x00000000, /* rk5 */
+ 0x63cd6124, 0x00000001, /* rk6 */
+ 0xf7011640, 0x00000001, /* rk7 */
+ 0xdb710640, 0x00000001 /* rk8 */
+};
+
+static const unsigned ALIGNED_(16) crc_mask[4] = {
+ 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000
+};
+
+static const unsigned ALIGNED_(16) crc_mask2[4] = {
+ 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
+};
+
+Z_INTERNAL uint32_t crc32_fold_final_pclmulqdq(crc32_fold *crc) {
+ const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask);
+ const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);
+ __m128i xmm_crc0, xmm_crc1, xmm_crc2, xmm_crc3;
+ __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
+
+ crc32_fold_load((__m128i *)crc->fold, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+ /*
+ * 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->value = ~((uint32_t)_mm_extract_epi32(xmm_crc3, 2));
+
+ return crc->value;
+}
+
+uint32_t crc32_pclmulqdq(uint32_t crc32, const unsigned char* buf, uint64_t len) {
+ /* For lens < 64, crc32_braid method is faster. The CRC32 instruction for
+ * these short lengths might also prove to be effective */
+ if (len < 64)
+ return crc32_braid(crc32, buf, len);
+
+ crc32_fold ALIGNED_(16) crc_state;
+ crc32_fold_reset_pclmulqdq(&crc_state);
+ crc32_fold_pclmulqdq(&crc_state, buf, len, crc32);
+ return crc32_fold_final_pclmulqdq(&crc_state);
+}
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-30 14:28:28 +0000