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liblzma: Set the MSVC optimization fix to only cover lzma_crc64_clmul().
After testing a 32-bit Release build on MSVC, only lzma_crc64_clmul() has the bug. crc_simd_body() and lzma_crc32_clmul() do not need the optimizations disabled.
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1 changed files with 15 additions and 15 deletions
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@ -42,21 +42,6 @@
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MASK_H(in, mask, high)
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// MSVC (VS2015 - VS2022) produces bad 32-bit x86 code from the CLMUL CRC
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// code when optimizations are enabled (release build). According to the bug
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// report, the ebx register is corrupted and the calculated result is wrong.
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// Trying to workaround the problem with "__asm mov ebx, ebx" didn't help.
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// The following pragma works and performance is still good. x86-64 builds
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// aren't affected by this problem.
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//
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// NOTE: Another pragma after lzma_crc64_clmul() restores the optimizations.
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// If the #if condition here is updated, the other one must be updated too.
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#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
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&& defined(_M_IX86)
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# pragma optimize("g", off)
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#endif
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#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
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__attribute__((__target__("ssse3,sse4.1,pclmul")))
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#endif
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@ -314,6 +299,21 @@ calc_hi(uint64_t poly, uint64_t a)
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#ifdef HAVE_CHECK_CRC64
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// MSVC (VS2015 - VS2022) produces bad 32-bit x86 code from the CLMUL CRC
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// code when optimizations are enabled (release build). According to the bug
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// report, the ebx register is corrupted and the calculated result is wrong.
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// Trying to workaround the problem with "__asm mov ebx, ebx" didn't help.
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// The following pragma works and performance is still good. x86-64 builds
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// and CRC32 CLMUL aren't affected by this problem. The problem does not
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// happen in crc_simd_body() either (which is shared with CRC32 CLMUL anyway).
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//
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// NOTE: Another pragma after lzma_crc64_clmul() restores the optimizations.
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// If the #if condition here is updated, the other one must be updated too.
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#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \
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&& defined(_M_IX86)
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# pragma optimize("g", off)
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#endif
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#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
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__attribute__((__target__("ssse3,sse4.1,pclmul")))
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#endif
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