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OpcodeDispatcher: Implements all the 3DNow! instructions #1597

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merged 7 commits into from
Mar 4, 2022

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This picks up all the instruction implementations, including 3DNow!
Extended and the Geode specific instructions that were added.

Most of these match preexisting SSE instructions except that they
operate at 64-bit and in the MMX registers.

This directly matches the AArch64 instruction and will be used shortly
If multiblock isn't enabled then on Unimplemented op we shouldn't create
a new block.

Was causing IR validation to get angry
We already decoded the modrm `rm` bits, check while decoding modrm to
ensure we don't try decoding it again.
Was causing double decoding of SIB and displacement bytes, breaking
things
Fully decoded the same way and adds the Geode specific instruction
decodings as well.
This picks up all the instruction implementations, including 3DNow!
Extended and the Geode specific instructions that were added.

Most of these match preexisting SSE instructions except that they
operate at 64-bit and in the MMX registers.
Now that we support these
Covers the full space, of which there aren't many.

3DNow! unit tests are disabled on the CI runner since the x86 CPU in CI
doesn't support it.
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