This nested loops microbenchmark only measures in-loop integer division optimizations on ARM64 - there are division fault handling differences which are ARM64 s

This nested loops microbenchmark only measures in-loop integer division optimizations on ARM64 - there are division fault handling differences which are ARM64 specific which introduce significant variance between compilers of comparable capability. On x86_64 I expect the numbers would have been much closer and within measurement error. The top half is within 0.5-0.59s - there really isn't much you can do inside such a loop, almost nothing happens there. As Isaac pointed out in a sibling comment - it's best to pick specific microbenchmarks, a selection of languages and implementations that interest you and dissect those - it will tell you much more.