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"So Firefox proceeds to use AVX on a CPU that has no AVX support". To make it clear; it uses AVX on a CPU that does support it (otherwise you'd run into an ille
by aaronmdjones 10y ago
"So Firefox proceeds to use AVX on a CPU that has no AVX support". To make it clear; it uses AVX on a CPU that does support it (otherwise you'd run into an illegal instruction error), but the OS doesn't. Firefox doesn't know this, however, because it thinks the OS set the bit that says it does.
- geofft 10y agoOh, does VZEROUPPER generate an illegal instruction if the OS has set the control register bit but has not called XSETBV? OK, that makes more sense.