Based on what I see on [Stack Overflow](https://stackoverflow.com/a/51908785 https://stackoverflow.com/a/51908785), it's recognized by all the major compilers

Based on what I see on [Stack Overflow](https://stackoverflow.com/a/51908785 https://stackoverflow.com/a/51908785), it's recognized by all the major compilers The [Microsoft Compiler help](https://docs.microsoft.com/en-us/cpp/intrinsics/x86-intrinsics-list?view=vs-2019 https://docs.microsoft.com/en-us/cpp/intrinsics/x86-intrinsi...) includes it in the "x86 intrinsics list". I've just compiled with success, for testing purposes, on an AMD processor. C, relevant section: #include <immintrin.h> void test() { _mm_pause(); } Output ASM, relevant section: test: .LFB4006: .cfi_startproc endbr64 pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset 6, -16 movq %rsp, %rbp .cfi_def_cfa_register 6 rep nop nop nop popq %rbp .cfi_def_cfa 7, 8 ret .cfi_endproc .LFE4006: .size test, .-test .globl main .type main, @function It should be the `rep nop`. Including `ammintrin.h` yields the same `rep nop`.