From e96dee55df04113c33b387ccdb6cb70935422d91 Mon Sep 17 00:00:00 2001 From: Lasse Collin Date: Mon, 9 Jan 2023 12:22:05 +0200 Subject: [PATCH] liblzma: CLMUL CRC64: Workaround a bug in MSVC (VS2015-2022). I haven't tested with MSVC myself and there doesn't seem to be information about the problem online, so I'm relying on the bug report. Thanks to Iouri Kharon for the bug report and the patch. --- src/liblzma/check/crc64_fast.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/liblzma/check/crc64_fast.c b/src/liblzma/check/crc64_fast.c index e3cbf1b1..1df0963e 100644 --- a/src/liblzma/check/crc64_fast.c +++ b/src/liblzma/check/crc64_fast.c @@ -279,6 +279,12 @@ crc64_clmul(const uint8_t *buf, size_t size, uint64_t crc) const __m128i initial_crc = _mm_cvtsi64_si128(~crc); #endif +#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__clang__) \ + && defined(_M_IX86) + // Workaround for MSVC when compiling for 32-bit x86: + __asm mov ebx, ebx ; force store ebx: VS2015-2022 destroy it :( +#endif + __m128i v0, v1, v2, v3; #ifndef CRC_USE_GENERIC_FOR_SMALL_INPUTS