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65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
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/* compare256_power9.c - Power9 version of compare256
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* Copyright (C) 2019 Matheus Castanho <msc@linux.ibm.com>, IBM
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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 POWER9
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#include <altivec.h>
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#include "../../zbuild.h"
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#include "../../zendian.h"
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/* Older versions of GCC misimplemented semantics for these bit counting builtins.
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* https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=3f30f2d1dbb3228b8468b26239fe60c2974ce2ac */
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#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 12)
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#if BYTE_ORDER == LITTLE_ENDIAN
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# define zng_vec_vctzlsbb(vc, len) len = __builtin_vec_vctzlsbb(vc)
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#else
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# define zng_vec_vctzlsbb(vc, len) len = __builtin_vec_vclzlsbb(vc)
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#endif
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#else
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# define zng_vec_vctzlsbb(vc, len) len = vec_cntlz_lsbb(vc)
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#endif
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static inline uint32_t compare256_power9_static(const uint8_t *src0, const uint8_t *src1) {
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uint32_t len = 0, cmplen;
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do {
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vector unsigned char vsrc0, vsrc1, vc;
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vsrc0 = *((vector unsigned char *)src0);
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vsrc1 = *((vector unsigned char *)src1);
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/* Compare 16 bytes at a time. Each byte of vc will be either
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* all ones or all zeroes, depending on the result of the comparison. */
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vc = (vector unsigned char)vec_cmpne(vsrc0, vsrc1);
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/* Since the index of matching bytes will contain only zeroes
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* on vc (since we used cmpne), counting the number of consecutive
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* bytes where LSB == 0 is the same as counting the length of the match. */
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zng_vec_vctzlsbb(vc, cmplen);
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if (cmplen != 16)
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return len + cmplen;
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src0 += 16, src1 += 16, len += 16;
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} while (len < 256);
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return 256;
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}
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Z_INTERNAL uint32_t compare256_power9(const uint8_t *src0, const uint8_t *src1) {
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return compare256_power9_static(src0, src1);
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}
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#define LONGEST_MATCH longest_match_power9
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#define COMPARE256 compare256_power9_static
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#include "match_tpl.h"
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#define LONGEST_MATCH_SLOW
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#define LONGEST_MATCH longest_match_slow_power9
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#define COMPARE256 compare256_power9_static
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#include "match_tpl.h"
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#endif
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