What is the most efficient way to do unsigned 64 bit comparison on SSE2?

PCMPGTQ doesn't exist on SSE2 and doesn't natively work on unsigned integers. Our goal here is to provide backward-compatible solutions for unsigned 64-bit comparisons so we can include them into the WebAssembly SIMD standard.

This is a sister question to this one for ARMv7+NEON: What is the most efficient way to do SIMD unsigned 64 bit comparison (CMHS) on ARMv7 with NEON?

And is related to the questions for signed comparisons variants already answered for SSE2 and Neon:

How to simulate pcmpgtq on sse2?

What is the most efficient way to support CMGT with 64bit signed comparisons on ARMv7a with Neon?

https://stackoverflow.com/questions/65441496/what-is-the-most-efficient-way-to-do-unsigned-64-bit-comparison-on-sse2 December 25, 2020 at 01:30AM