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[MSVC-specific] Define EIGEN_ARCH_x86_64 for native x64 (_M_X64 is defined and _M_ARM64EC is not), and define EIGEN_ARCH_ARM64 for both the native ARM64 (_M_ARM64 is defined) or ARM64EC (_M_ARM64EC is defined). _M_ARM64EC is defined when the code is compiled by MSVC for ARM64EC, a new ARM64 ABI designed to be compatible with x64 application emulation on ARM64. If _M_ARM64EC is defined, _M_X64 and _M_AMD64 are also defined, so x64-specific code (especially intrinsics) is also compiled to ARM64 instructions (compliant with the ARM64EC ABI) for maximum x64 compatibility. Although a majority of x64-specific intrinsics can emulated by ARM64 instructions, it is still a good to simply recompile the native ARM64 code paths to ARM64EC for pure computation tasks, for performance reasons.

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Ben Niu 2021-03-08 19:43:38 +00:00 committed by David Tellenbach
parent 853a5c4b84
commit b8d1857f0d
1 changed files with 2 additions and 2 deletions
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4
Eigen/src/Core/util/Macros.h
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@ -226,7 +226,7 @@
//------------------------------------------------------------------------------------------
#if defined(__x86_64__) || defined(_M_X64) || defined(__amd64)
#if defined(__x86_64__) || (defined(_M_X64) && !defined(_M_ARM64EC)) || defined(__amd64)
#define EIGEN_ARCH_x86_64 1
#else
#define EIGEN_ARCH_x86_64 0
@ -252,7 +252,7 @@
#endif
/// \internal EIGEN_ARCH_ARM64 set to 1 if the architecture is ARM64
#if defined(__aarch64__)
#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
#define EIGEN_ARCH_ARM64 1
#else
#define EIGEN_ARCH_ARM64 0