Benchmark Analysis: AVX2 Runs Slower Than SSE2-4.x Under Windows ARM Emulation
By
vintagedave
Toasted golden, schmeared with insight. Top of the rack.
Summary
The article investigates the performance of AVX2 versus SSE2-4.x instruction sets when running under Windows ARM emulation. The author conducted benchmarks and discovered that contrary to expectations, AVX2 code runs significantly slower - at about two-thirds the speed of equivalent SSE2-SSE4.x optimized code when emulated on Windows 11 ARM. The post details the testing methodology, benchmark results, and provides practical guidance for developers on whether to compile for AVX2 if their applications might run on Windows ARM systems.
Key quotes
· 4 pulledAVX2 code runs at 2/3 the speed of equivalent SSE2-SSE4.x optimised code under emulation on Windows 11 ARM.
I assumed it would be roughly the same — maybe slightly slower due to emulation overhead, but AVX2's wider operations would compensate. The headline gives it away: I was wrong.
If you compile your app for AVX2 and it runs on Windows ARM under Prism emulation, is it faster or slower than compiling for SSE2-4.x?
'Should I compile for AVX2 if my app might run on Windows ARM?' has a
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