AuroraMiddleware/lz4
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faster decoding speed with Visual

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by enabling the fast decoder path.
Visual requires a different set of macro constants to detect x86 / x64.

On my laptop, decoding speed on x64 went up from 3.12 to 3.45 GB/s.
32-bit is less impressive, though still favorable,
with speed increasing from 2.55 to 2.60 GB/s.

So both cases are now enabled.

Suggested by Bartosz Taudul (@wolfpld).
This commit is contained in:
Yann Collet 2019-12-02 16:38:33 -08:00
parent bed083b3c7
commit 0f6cbd996f
2 changed files with 6 additions and 3 deletions
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3
.gitignore vendored
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@ -26,6 +26,9 @@ _codelite_lz4/
bin/
*.zip
# analyzers
infer-out
# Mac
.DS_Store
*.dSYM

6
lib/lz4.c
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@ -374,12 +374,12 @@ static const int dec64table[8] = {0, 0, 0, -1, -4, 1, 2, 3};
#ifndef LZ4_FAST_DEC_LOOP
# if defined(__i386__) || defined(__x86_64__)
# if defined __i386__ || defined _M_IX86 || defined __x86_64__ || defined _M_X64
# define LZ4_FAST_DEC_LOOP 1
# elif defined(__aarch64__) && !defined(__clang__)
/* On aarch64, we disable this optimization for clang because on certain
* mobile chipsets and clang, it reduces performance. For more information
* refer to https://github.com/lz4/lz4/pull/707. */
* mobile chipsets, performance is reduced with clang. For information
* refer to https://github.com/lz4/lz4/pull/707 */
# define LZ4_FAST_DEC_LOOP 1
# else
# define LZ4_FAST_DEC_LOOP 0