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2957f5084d
* 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
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* Optimized slide_hash for POWER processors
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* Copyright (C) 2019-2020 IBM Corporation
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* Author: Matheus Castanho <msc@linux.ibm.com>
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#ifdef POWER8_VSX_SLIDEHASH
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#include <altivec.h>
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#include "zbuild.h"
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#include "deflate.h"
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static inline void slide_hash_power8_loop(deflate_state *s, unsigned n_elems, Pos *table_end) {
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vector unsigned short vw, vm, *vp;
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unsigned chunks;
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/* Each vector register (chunk) corresponds to 128 bits == 8 Posf,
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* so instead of processing each of the n_elems in the hash table
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* individually, we can do it in chunks of 8 with vector instructions.
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*
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* This function is only called from slide_hash_power8(), and both calls
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* pass n_elems as a power of 2 higher than 2^7, as defined by
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* deflateInit2_(), so n_elems will always be a multiple of 8. */
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chunks = n_elems >> 3;
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Assert(n_elems % 8 == 0, "Weird hash table size!");
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/* This type casting is safe since s->w_size is always <= 64KB
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* as defined by deflateInit2_() and Posf == unsigned short */
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vw[0] = (Pos) s->w_size;
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vw = vec_splat(vw,0);
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vp = (vector unsigned short *) table_end;
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do {
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/* Processing 8 elements at a time */
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vp--;
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vm = *vp;
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/* This is equivalent to: m >= w_size ? m - w_size : 0
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* Since we are using a saturated unsigned subtraction, any
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* values that are > w_size will be set to 0, while the others
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* will be subtracted by w_size. */
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*vp = vec_subs(vm,vw);
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} while (--chunks);
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}
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void Z_INTERNAL slide_hash_power8(deflate_state *s) {
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unsigned int n;
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Pos *p;
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n = HASH_SIZE;
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p = &s->head[n];
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slide_hash_power8_loop(s,n,p);
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n = s->w_size;
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p = &s->prev[n];
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slide_hash_power8_loop(s,n,p);
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}
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#endif /* POWER8_VSX_SLIDEHASH */
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