4 ms·
Rosetta uses software emulation for x87 floating point. That's slow, but in practice that doesn't matter much. Mac software never had a reason to use x87 FP, ev
by pdw 1y ago
Rosetta uses software emulation for x87 floating point. That's slow, but in practice that doesn't matter much. Mac software never had a reason to use x87 FP, every Intel Mac had at least SSE3 support.
- ksherlock 1y agoThere was at least one reason... long double x87me(long double a, long double b) { return a+b; } pushq %rbp movq %rsp, %rbp fldt 32(%rbp) fldt 16(%rbp) faddp %st(1) popq %rbp retq
- adastra22 1y agowhat is this?
- Tankenstein 1y agoLooks like a demonstration that using `long double` math requires dipping into x87 instructions, specifically the `fldt` instruction: "floating point load ten bytes".