1 files changed, 44 insertions, 0 deletions
diff --git a/neozip/arch/power/slide_ppc_tpl.h b/neozip/arch/power/slide_ppc_tpl.h
new file mode 100644
index 0000000000..24629b4039
--- /dev/null
+++ b/neozip/arch/power/slide_ppc_tpl.h
@@ -0,0 +1,44 @@
+/* Optimized slide_hash for PowerPC processors
+ * Copyright (C) 2017-2021 Mika T. Lindqvist <postmaster@raasu.org>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include <altivec.h>
+#include "zbuild.h"
+#include "deflate.h"
+
+static inline void slide_hash_chain(Pos *table, uint32_t entries, uint16_t wsize) {
+    const vector unsigned short vmx_wsize = vec_splats(wsize);
+    Pos *p = table;
+
+    do {
+        /* Do the pointer arithmetic early to hopefully overlap the vector unit */
+        Pos *q = p;
+        p += 32;
+        vector unsigned short value0, value1, value2, value3;
+        vector unsigned short result0, result1, result2, result3;
+
+        value0 = vec_ld(0, q);
+        value1 = vec_ld(16, q);
+        value2 = vec_ld(32, q);
+        value3 = vec_ld(48, q);
+        result0 = vec_subs(value0, vmx_wsize);
+        result1 = vec_subs(value1, vmx_wsize);
+        result2 = vec_subs(value2, vmx_wsize);
+        result3 = vec_subs(value3, vmx_wsize);
+        vec_st(result0, 0, q);
+        vec_st(result1, 16, q);
+        vec_st(result2, 32, q);
+        vec_st(result3, 48, q);
+
+        entries -= 32;
+   } while (entries);
+}
+
+void Z_INTERNAL SLIDE_PPC(deflate_state *s) {
+    Assert(s->w_size <= UINT16_MAX, "w_size should fit in uint16_t");
+    uint16_t wsize = (uint16_t)s->w_size;
+
+    slide_hash_chain(s->head, HASH_SIZE, wsize);
+    slide_hash_chain(s->prev, wsize, wsize);
+}