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64 lines
2.1 KiB
64 lines
2.1 KiB
/* 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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