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Skip the alignment bug workaround for Clang

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Clang-10.0.0 poses as gcc-4.2:

$ clang++ -E -dM - </dev/null | grep GNUC

This means that Clang is using the workaround for the alignment bug of gcc-8
even though it does not have the bug (as far as I know).

This patch should speed up AVX2 and AVX512 compiles on Windows (when using Clang),
because it disables (for Clang) the gcc workaround we had introduced in this commit:
https://github.com/official-stockfish/Stockfish/commit/875183b310a8249922c2155e82cb4cecfae2097e

closes https://github.com/official-stockfish/Stockfish/pull/3050

No functional change.
This commit is contained in:
syzygy1
2020-08-22 13:36:34 +02:00
committed by Stéphane Nicolet
parent 5f1843c9cb
commit cc9d503dde
1 changed files with 2 additions and 2 deletions
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src/nnue/nnue_common.h
+2 -2
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@@ -47,7 +47,7 @@
// compiled with older g++ crashes because the output memory is not aligned // compiled with older g++ crashes because the output memory is not aligned
// even though alignas is specified. // even though alignas is specified.
#if defined(USE_AVX2) #if defined(USE_AVX2)
#if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) #if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) && !defined(__clang__)
#define _mm256_loadA_si256 _mm256_loadu_si256 #define _mm256_loadA_si256 _mm256_loadu_si256
#define _mm256_storeA_si256 _mm256_storeu_si256 #define _mm256_storeA_si256 _mm256_storeu_si256
#else #else
@@ -57,7 +57,7 @@
#endif #endif
#if defined(USE_AVX512) #if defined(USE_AVX512)
#if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) #if defined(__GNUC__ ) && (__GNUC__ < 9) && defined(_WIN32) && !defined(__clang__)
#define _mm512_loadA_si512 _mm512_loadu_si512 #define _mm512_loadA_si512 _mm512_loadu_si512
#define _mm512_storeA_si512 _mm512_storeu_si512 #define _mm512_storeA_si512 _mm512_storeu_si512
#else #else