[Library] Update zlibng (#1255)

* Update zlibng * Set cmake path more directly in zlibng to hopefully fix an issue with the build on drone * I'm dumb, missing / in path * Mackal helps with a dumb gitignore issue * Adding all the files, not sure what's ignoring them and im tired of looking * Some tweaks to zlibng build to hopefully get it to build properly. works on msvc now
2026-06-26 19:47:16 +00:00 · 2021-02-23 17:00:26 -08:00
parent e6dee96266
commit 2957f5084d
184 changed files with 21431 additions and 11703 deletions
@@ -0,0 +1,60 @@
+/* Optimized slide_hash for POWER processors
+ * Copyright (C) 2019-2020 IBM Corporation
+ * Author: Matheus Castanho <msc@linux.ibm.com>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef POWER8_VSX_SLIDEHASH
+
+#include <altivec.h>
+#include "zbuild.h"
+#include "deflate.h"
+
+static inline void slide_hash_power8_loop(deflate_state *s, unsigned n_elems, Pos *table_end) {
+    vector unsigned short vw, vm, *vp;
+    unsigned chunks;
+
+    /* Each vector register (chunk) corresponds to 128 bits == 8 Posf,
+     * so instead of processing each of the n_elems in the hash table
+     * individually, we can do it in chunks of 8 with vector instructions.
+     *
+     * This function is only called from slide_hash_power8(), and both calls
+     * pass n_elems as a power of 2 higher than 2^7, as defined by
+     * deflateInit2_(), so n_elems will always be a multiple of 8. */
+    chunks = n_elems >> 3;
+    Assert(n_elems % 8 == 0, "Weird hash table size!");
+
+    /* This type casting is safe since s->w_size is always <= 64KB
+     * as defined by deflateInit2_() and Posf == unsigned short */
+    vw[0] = (Pos) s->w_size;
+    vw = vec_splat(vw,0);
+
+    vp = (vector unsigned short *) table_end;
+
+    do {
+        /* Processing 8 elements at a time */
+        vp--;
+        vm = *vp;
+
+        /* This is equivalent to: m >= w_size ? m - w_size : 0
+         * Since we are using a saturated unsigned subtraction, any
+         * values that are > w_size will be set to 0, while the others
+         * will be subtracted by w_size. */
+        *vp = vec_subs(vm,vw);
+    } while (--chunks);
+}
+
+void Z_INTERNAL slide_hash_power8(deflate_state *s) {
+    unsigned int n;
+    Pos *p;
+
+    n = HASH_SIZE;
+    p = &s->head[n];
+    slide_hash_power8_loop(s,n,p);
+
+    n = s->w_size;
+    p = &s->prev[n];
+    slide_hash_power8_loop(s,n,p);
+}
+
+#endif /* POWER8_VSX_SLIDEHASH */