Shengchen Kan 58bb2d1956
[X86][MC] Support encoding of EGPR for APX (#71909)
#70958 adds registers R16-R31 (EGPR), this patch
1. Introduces a new instruction prefix REX2
2. Supports encoding of EGPR with REX2 for legacy instructions in MAP
0/1
3. Supports encoding of EGPR with EVEX for the existing instructions in
EVEX space

RFC:

https://discourse.llvm.org/t/rfc-design-for-apx-feature-egpr-and-ndd-support/73031/4
2023-11-13 15:27:42 +08:00
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