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Disable x64-specific optimizations for ARM64EC ReadInt64 (#6506)

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ARM64EC is a new ARM64 ABI designed by Microsoft to support x64 application emulation on ARM64 CPUs. When compiling for ARM64EC, both the _M_X64 and _M_ARM64EC macros are defined. However, that causes problem in compiling this file, because the __movsb intrinsic, which is lowered to rep movsb, is not supported on ARM64, so the optimization for native x64 should be disabled for ARM64EC.
This commit is contained in:
Ben Niu
2021-03-08 10:53:04 -08:00
committed by GitHub
parent fac64918dc
commit 9a4f1f434b
1 changed files with 1 additions and 1 deletions
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include/flatbuffers/flexbuffers.h
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@@ -155,7 +155,7 @@ inline uint64_t ReadUInt64(const uint8_t *data, uint8_t byte_width) {
// constant, which here it isn't. Test if memcpy is still faster than
// the conditionals in ReadSizedScalar. Can also use inline asm.
// clang-format off
#if defined(_MSC_VER) && (defined(_M_X64) || defined _M_IX86)
#if defined(_MSC_VER) && ((defined(_M_X64) && !defined(_M_ARM64EC)) || defined _M_IX86)
uint64_t u = 0;
__movsb(reinterpret_cast<uint8_t *>(&u),
reinterpret_cast<const uint8_t *>(data), byte_width);