Add 'neozip/' from commit 'c2712b8a345191f6ed79558c089777df94590087'

git-subtree-dir: neozip
git-subtree-mainline: b1e34e861b5d732afe828d58aad2c638135061fd
git-subtree-split: c2712b8a345191f6ed79558c089777df94590087

1 files changed, 29 insertions, 0 deletions

diff --git a/neozip/arch/x86/adler32_ssse3_p.h b/neozip/arch/x86/adler32_ssse3_p.h
new file mode 100644
index 0000000000..d7ec3fe0d5
--- /dev/null
+++ b/neozip/arch/x86/adler32_ssse3_p.h
@@ -0,0 +1,29 @@
+/* adler32_ssse3_p.h -- adler32 ssse3 utility functions
+ * Copyright (C) 2022 Adam Stylinski
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifndef ADLER32_SSSE3_P_H_
+#define ADLER32_SSSE3_P_H_
+
+#ifdef X86_SSSE3
+
+#include <immintrin.h>
+#include <stdint.h>
+
+static inline uint32_t partial_hsum(__m128i x) {
+    __m128i second_int = _mm_srli_si128(x, 8);
+    __m128i sum = _mm_add_epi32(x, second_int);
+    return _mm_cvtsi128_si32(sum);
+}
+
+static inline uint32_t hsum(__m128i x) {
+    __m128i sum1 = _mm_unpackhi_epi64(x, x);
+    __m128i sum2 = _mm_add_epi32(x, sum1);
+    __m128i sum3 = _mm_shuffle_epi32(sum2, 0x01);
+    __m128i sum4 = _mm_add_epi32(sum2, sum3);
+    return _mm_cvtsi128_si32(sum4);
+}
+#endif
+
+#endif