From 6d48afc6c04e044bc1cb5c3817e85b68963909f3 Mon Sep 17 00:00:00 2001 From: MITSUNARI Shigeo Date: Sat, 19 Oct 2024 08:54:43 +0900 Subject: [skip ci] [doc] update encoding of vmovd and vmovw with REG-to-XMM --- doc/usage.md | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/doc/usage.md b/doc/usage.md index 132020a..b28d772 100644 --- a/doc/usage.md +++ b/doc/usage.md @@ -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) -- cgit v1.2.3