To set the /arch:AVX, /arch:AVX2 or /arch:AVX512 compiler option in Visual Studio Limited support for /arch:AVX512 was added in Visual Studio 2017, and expanded in Visual Studio 2019. The /arch:AVX2 option was introduced in Visual Studio 2013 Update 2, version 7.1. For more information, see Predefined macros. The _AVX512F_, _AVX512CD_, _AVX512BW_, _AVX512DQ_ and _AVX512VL_ preprocessor symbols are defined when the /arch:AVX512 compiler option is specified. ![]() The _AVX2_ preprocessor symbol is defined when the /arch:AVX2 or /arch:AVX512 compiler option is specified. The _AVX_ preprocessor symbol is defined when the /arch:AVX, /arch:AVX2 or /arch:AVX512 compiler option is specified. An example is the use of certain BMI instructions when /arch:AVX2 is specified. Instructions for other operations were also added.Įach /arch option may also enable the use of other non-vector instructions that are associated with that option. (For legacy compatibility, SSE-style vector instructions preserve all bits beyond bit 127.) Most floating-point operations are extended to 256 bits.ĪVX2 extends most integer operations to 256-bit vectors and enables use of Fused Multiply-Add (FMA) instructions.ĪVX-512 introduced another instruction encoding form that allows 512-bit vectors, plus certain other optional features. It allows vectors of either 128 bits or 256 bits, and zero-extends all vector results to the full vector size. These instructions allow calculation with 128-bit vectors of single-precision, double-precision and 1, 2, 4 or 8-byte integer values, as well as single-precision and double-precision scalar floating-point values.ĪVX introduced an alternative instruction encoding for vector and floating-point scalar instructions. The default mode uses SSE2 instructions for scalar floating-point and vector calculations. The processor extensions have the following characteristics: When you use /clr to compile, /arch has no effect on code generation for managed functions. arch only affects code generation for native functions. In general, more recently introduced processors may support extensions beyond the ones supported by older processors, although you should consult the documentation for a particular processor or test for instruction set extension support using _cpuid before executing code using an instruction set extension. The /arch option enables the use of certain instruction set extensions, particularly for vector calculation, available in processors from Intel and AMD. SyntaxĮnables the use of Intel Advanced Vector Extensions instructions.Įnables the use of Intel Advanced Vector Extensions 2 instructions.Įnables the use of Intel Advanced Vector Extensions 512 instructions. For more information on /arch for other target architectures, see /arch (x86), /arch (ARM64), and /arch (ARM). Specifies the architecture for code generation on 圆4.
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