1 files changed, 126 insertions, 0 deletions
diff --git a/neozip/arch/loongarch/chunkset_lasx.c b/neozip/arch/loongarch/chunkset_lasx.c
new file mode 100644
index 0000000000..905704172d
--- /dev/null
+++ b/neozip/arch/loongarch/chunkset_lasx.c
@@ -0,0 +1,126 @@
+/* chunkset_lasx.c -- LASX inline functions to copy small data chunks, based on Intel AVX2 implementation
+ * Copyright (C) 2025 Vladislav Shchapov <vladislav@shchapov.ru>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef LOONGARCH_LASX
+
+#include "zbuild.h"
+#include "zsanitizer.h"
+#include "zmemory.h"
+
+#include <lasxintrin.h>
+#include "lasxintrin_ext.h"
+#include "lsxintrin_ext.h"
+
+#include "arch/generic/chunk_256bit_perm_idx_lut.h"
+
+typedef __m256i chunk_t;
+typedef __m128i halfchunk_t;
+
+#define HAVE_CHUNKMEMSET_2
+#define HAVE_CHUNKMEMSET_4
+#define HAVE_CHUNKMEMSET_8
+#define HAVE_CHUNKMEMSET_16
+#define HAVE_CHUNK_MAG
+#define HAVE_HALF_CHUNK
+
+static inline void chunkmemset_2(uint8_t *from, chunk_t *chunk) {
+    *chunk = __lasx_xvreplgr2vr_h(zng_memread_2(from));
+}
+
+static inline void chunkmemset_4(uint8_t *from, chunk_t *chunk) {
+    *chunk = __lasx_xvreplgr2vr_w(zng_memread_4(from));
+}
+
+static inline void chunkmemset_8(uint8_t *from, chunk_t *chunk) {
+    *chunk = __lasx_xvreplgr2vr_d(zng_memread_8(from));
+}
+
+static inline void chunkmemset_16(uint8_t *from, chunk_t *chunk) {
+    *chunk = lasx_broadcast_128(__lsx_vld(from, 0));
+}
+
+static inline void loadchunk(uint8_t const *s, chunk_t *chunk) {
+    *chunk = __lasx_xvld(s, 0);
+}
+
+static inline void storechunk(uint8_t *out, chunk_t *chunk) {
+    __lasx_xvst(*chunk, out, 0);
+}
+
+static inline chunk_t GET_CHUNK_MAG(uint8_t *buf, size_t *chunk_rem, size_t dist) {
+    lut_rem_pair lut_rem = perm_idx_lut[dist - 3];
+    __m256i ret_vec;
+    /* While technically we only need to read 4 or 8 bytes into this vector register for a lot of cases, GCC is
+     * compiling this to a shared load for all branches, preferring the simpler code.  Given that the buf value isn't in
+     * GPRs to begin with the 256 bit load is _probably_ just as inexpensive */
+    *chunk_rem = lut_rem.remval;
+
+    /* See note in chunkset_ssse3.c for why this is ok */
+    __msan_unpoison(buf + dist, 32 - dist);
+
+    if (dist < 16) {
+        /* This simpler case still requires us to shuffle in 128 bit lanes, so we must apply a static offset after
+         * broadcasting the first vector register to both halves. This is _marginally_ faster than doing two separate
+         * shuffles and combining the halves later */
+        __m256i perm_vec = __lasx_xvld(permute_table+lut_rem.idx, 0);
+        __m128i ret_vec0 = __lsx_vld(buf, 0);
+        ret_vec = __lasx_concat_128(ret_vec0, ret_vec0);
+        ret_vec = lasx_shuffle_b(ret_vec, perm_vec);
+    }  else {
+        __m128i ret_vec0 = __lsx_vld(buf, 0);
+        __m128i ret_vec1 = __lsx_vld(buf, 16);
+        /* Take advantage of the fact that only the latter half of the 256 bit vector will actually differ */
+        __m128i perm_vec1 = __lsx_vld(permute_table + lut_rem.idx, 0);
+        __m128i xlane_permutes = __lsx_vslt_b(perm_vec1, __lsx_vreplgr2vr_b(16));
+        __m128i xlane_res  = lsx_shuffle_b(ret_vec0, perm_vec1);
+        /* Since we can't wrap twice, we can simply keep the later half exactly how it is instead of having to _also_
+         * shuffle those values */
+        __m128i latter_half = __lsx_vbitsel_v(ret_vec1, xlane_res, xlane_permutes);
+        ret_vec = __lasx_concat_128(ret_vec0, latter_half);
+    }
+
+    return ret_vec;
+}
+
+static inline void loadhalfchunk(uint8_t const *s, halfchunk_t *chunk) {
+    *chunk = __lsx_vld(s, 0);
+}
+
+static inline void storehalfchunk(uint8_t *out, halfchunk_t *chunk) {
+    __lsx_vst(*chunk, out, 0);
+}
+
+static inline chunk_t halfchunk2whole(halfchunk_t *chunk) {
+    /* We zero extend mostly to appease some memory sanitizers. These bytes are ultimately
+     * unlikely to be actually written or read from */
+    return lasx_zext_128(*chunk);
+}
+
+static inline halfchunk_t GET_HALFCHUNK_MAG(uint8_t *buf, size_t *chunk_rem, size_t dist) {
+    lut_rem_pair lut_rem = perm_idx_lut[dist - 3];
+    __m128i perm_vec, ret_vec;
+    __msan_unpoison(buf + dist, 16 - dist);
+    ret_vec = __lsx_vld(buf, 0);
+    *chunk_rem = half_rem_vals[dist - 3];
+
+    perm_vec = __lsx_vld(permute_table + lut_rem.idx, 0);
+    ret_vec = lsx_shuffle_b(ret_vec, perm_vec);
+
+    return ret_vec;
+}
+
+#define CHUNKSIZE        chunksize_lasx
+#define CHUNKCOPY        chunkcopy_lasx
+#define CHUNKUNROLL      chunkunroll_lasx
+#define CHUNKMEMSET      chunkmemset_lasx
+#define CHUNKMEMSET_SAFE chunkmemset_safe_lasx
+
+#include "chunkset_tpl.h"
+
+#define INFLATE_FAST     inflate_fast_lasx
+
+#include "inffast_tpl.h"
+
+#endif