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[skip ci] [doc] update encoding of vmovd and vmovw with REG-to-XMM

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MITSUNARI Shigeo 2024-10-19 08:54:43 +09:00
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doc/usage.md
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@ -154,11 +154,17 @@ feature|AVX512-VNNI|AVX-VNNI
-|-|-
feature|AVX-VNNI-INT8, AVX512-FP16|AVX10.2
- Target functions: vmpsadbw, vpdpbssd, vpdpbssds, vpdpbsud, vpdpbsuds, vpdpbuud, vpdpbuuds, vpdpwsud vpdpwsuds vpdpwusd vpdpwusds vpdpwuud, vpdpwuuds, vmovd, vmovw
- Target functions: vmpsadbw, vpdpbssd, vpdpbssds, vpdpbsud, vpdpbsuds, vpdpbuud, vpdpbuuds, vpdpwsud vpdpwsuds vpdpwusd vpdpwusds vpdpwuud, vpdpwuuds and vmovd, vmovw with MEM-to-MEM.
- Remark: vmovd and vmovw several kinds of encoding such as AVX/AVX512F/AVX512-FP16/AVX10.2.
At first, I attempted to use EvexEncoding (resp. VexEncoding) instead of AVX10v2Encoding (resp. EvexEncoding) for `setDefaultEncodingAVX10`.
But I abandoned this idea when I found that `vmovd` and `vmovw` had different EVEX encodings in AVX512 and AVX10.2
### Remark
1. `vmovd` and `vmovw` instructions with REG-to-XMM or XMM-to-REG operands are always encoded using AVX10.1.
When used with XMM-to-XMM operands, these instructions are always encoded using AVX10.2.
2. `vmovd` and `vmovw` instructions with MEM-to-MEM operands support multiple encoding formats, including AVX, AVX512F, AVX512-FP16, and AVX10.2.
Initially, I tried implementing `setDefaultEncodingAVX10` using `EvexEncoding` (resp. `VexEncoding`) instead of `AVX10v2Encoding` (resp. `EvexEncoding`).
However, I abandoned this approach after discovering the complexity of the encoding requirements of `vmovd` and `vmovw`.
## APX
[Advanced Performance Extensions (APX) Architecture Specification](https://www.intel.com/content/www/us/en/content-details/786223/intel-advanced-performance-extensions-intel-apx-architecture-specification.html)