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[bmi2] Add lzcnt and bmi target attributes

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* When dynamic dispatching to bmi2 add lzcnt and bmi to the
  TARGET_ATTRIBUTE.
* Centralize the bmi2 TARGET_ATTRIBUTE definition to
  BMI2_TARGET_ATTRIBUTE so we can change it in the future.
* Only enable bmi2 when both bmi1 & bmi2 are supported. There shouldn't
  be any cases where bmi2 is supported but bmi1 isn't. But, since we are
  using the instruction we should check bmi1 as well.
This commit is contained in:
Nick Terrell
2021-11-30 17:54:56 -08:00
parent 7847c2fd68
commit 5414dd7978
10 changed files with 31 additions and 17 deletions
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lib/compress/zstd_compress_sequences.c
+1 -1
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@@ -399,7 +399,7 @@ ZSTD_encodeSequences_default(
#if DYNAMIC_BMI2
static TARGET_ATTRIBUTE("bmi2") size_t
static BMI2_TARGET_ATTRIBUTE size_t
ZSTD_encodeSequences_bmi2(
void* dst, size_t dstCapacity,
FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,