On Wed, Jun 12, 2024 at 05:35:24PM +0100, Daniel P. Berrangé wrote:
> It isn't as simple as changing the CFLAGS. QEMU used to check for
> the CPU feature at startup, set a flag, and then later use that flag
> to choose different codepaths, but this logic was removed. Avoiding
> the flag check in hot-paths makes a perf difference.
Can't QEMU upstream be convinced to make it configurable, perhaps with
default requiring SSE4 and when configured/built to support even older HW
take the performance hit to support it?
Jakub
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