Displaying 2 results from an estimated 2 matches for "penium2".
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pentium2
2020 Aug 30
3
Proposal to remove MMX support.
...e SSE2, most code will switch to
using SSE2 instructions instead of MMX instructions when using intrinsics,
and continue to compile fine. It'll also likely be faster, since MMX
instructions are legacy, and not optimized in CPUs anymore.
- Code explicitly disabling SSE2 (e.g. -mno-sse2 or -march=penium2) will
stop compiling if it requires MMX intrinsics.
- Code using the intrinsics will run faster, especially on x86-64, where
the vectors are passed around in xmm registers, and is being copied to mm
registers just to run a legacy instruction. But even without that, the mmx
instructions also just ha...
2020 Aug 31
2
Proposal to remove MMX support.
...itch to
> using SSE2 instructions instead of MMX instructions when using intrinsics,
> and continue to compile fine. It'll also likely be faster, since MMX
> instructions are legacy, and not optimized in CPUs anymore.
>
> - Code explicitly disabling SSE2 (e.g. -mno-sse2 or -march=penium2) will
> stop compiling if it requires MMX intrinsics.
>
> - Code using the intrinsics will run faster, especially on x86-64, where
> the vectors are passed around in xmm registers, and is being copied to mm
> registers just to run a legacy instruction. But even without that, the mmx...