1 files changed, 102 insertions, 0 deletions
diff --git a/neozip/arch/x86/adler32_avx512.c b/neozip/arch/x86/adler32_avx512.c
new file mode 100644
index 0000000000..8a8e165bb9
--- /dev/null
+++ b/neozip/arch/x86/adler32_avx512.c
@@ -0,0 +1,102 @@
+/* adler32_avx512.c -- compute the Adler-32 checksum of a data stream
+ * Copyright (C) 1995-2011 Mark Adler
+ * Authors:
+ *   Adam Stylinski <kungfujesus06@gmail.com>
+ *   Brian Bockelman <bockelman@gmail.com>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef X86_AVX512
+
+#include "zbuild.h"
+#include "adler32_p.h"
+#include "arch_functions.h"
+#include <immintrin.h>
+#include "x86_intrins.h"
+#include "adler32_avx512_p.h"
+
+Z_FORCEINLINE static uint32_t adler32_copy_impl(uint32_t adler, uint8_t *dst, const uint8_t *src, size_t len, const int COPY) {
+    uint32_t adler0, adler1;
+    adler1 = (adler >> 16) & 0xffff;
+    adler0 = adler & 0xffff;
+
+rem_peel:
+    if (len < 64) {
+        /* This handles the remaining copies, just call normal adler checksum after this */
+        if (COPY && len) {
+            __mmask64 storemask = (0xFFFFFFFFFFFFFFFFUL >> (64 - len));
+            __m512i copy_vec = _mm512_maskz_loadu_epi8(storemask, src);
+            _mm512_mask_storeu_epi8(dst, storemask, copy_vec);
+        }
+
+        return adler32_avx2(adler, src, len);
+    }
+
+    __m512i vbuf, vs1_0, vs3;
+
+    const __m512i dot2v = _mm512_set_epi8(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+                                          20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
+                                          38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
+                                          56, 57, 58, 59, 60, 61, 62, 63, 64);
+    const __m512i dot3v = _mm512_set1_epi16(1);
+    const __m512i zero = _mm512_setzero_si512();
+
+    while (len >= 64) {
+        __m512i vs1 = _mm512_zextsi128_si512(_mm_cvtsi32_si128(adler0));
+        __m512i vs2 = _mm512_zextsi128_si512(_mm_cvtsi32_si128(adler1));
+        vs1_0 = vs1;
+        vs3 = _mm512_setzero_si512();
+
+        size_t k = ALIGN_DOWN(MIN(len, NMAX), 64);
+        len -= k;
+
+        while (k >= 64) {
+            /*
+               vs1 = adler + sum(c[i])
+               vs2 = sum2 + 64 vs1 + sum( (64-i+1) c[i] )
+            */
+            vbuf = _mm512_loadu_si512(src);
+
+            if (COPY) {
+                _mm512_storeu_si512(dst, vbuf);
+                dst += 64;
+            }
+
+            src += 64;
+            k -= 64;
+
+            __m512i vs1_sad = _mm512_sad_epu8(vbuf, zero);
+            __m512i v_short_sum2 = _mm512_maddubs_epi16(vbuf, dot2v);
+            vs1 = _mm512_add_epi32(vs1_sad, vs1);
+            vs3 = _mm512_add_epi32(vs3, vs1_0);
+            __m512i vsum2 = _mm512_madd_epi16(v_short_sum2, dot3v);
+            vs2 = _mm512_add_epi32(vsum2, vs2);
+            vs1_0 = vs1;
+        }
+
+        vs3 = _mm512_slli_epi32(vs3, 6);
+        vs2 = _mm512_add_epi32(vs2, vs3);
+
+        adler0 = partial_hsum(vs1) % BASE;
+        adler1 = _mm512_reduce_add_epu32(vs2) % BASE;
+    }
+
+    adler = adler0 | (adler1 << 16);
+
+    /* Process tail (len < 64). */
+    if (len) {
+        goto rem_peel;
+    }
+
+    return adler;
+}
+
+Z_INTERNAL uint32_t adler32_avx512(uint32_t adler, const uint8_t *src, size_t len) {
+    return adler32_copy_impl(adler, NULL, src, len, 0);
+}
+
+Z_INTERNAL uint32_t adler32_copy_avx512(uint32_t adler, uint8_t *dst, const uint8_t *src, size_t len) {
+    return adler32_copy_impl(adler, dst, src, len, 1);
+}
+
+#endif