From 1548b4e11c399f50fd4b6b9ec693d784248b5ced Mon Sep 17 00:00:00 2001
From: "Herman S." <429230+has207@users.noreply.github.com>
Date: Sun, 19 Oct 2025 13:56:23 +0900
Subject: [PATCH] [CPU/PPC] Add VX128_2 VC field support for vperm128

Add 3-bit VC field to VX128_2 format structure to support
instructions like vperm128 that use 4 distinct vector operands.

The VC field occupies bits 6-8 of the instruction encoding.
---
 src/xenia/cpu/ppc/ppc_decode_data.h | 4 +++-
 src/xenia/cpu/ppc/ppc_instr.h       | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/xenia/cpu/ppc/ppc_decode_data.h b/src/xenia/cpu/ppc/ppc_decode_data.h
index 1845848d4..06a1d92f6 100644
--- a/src/xenia/cpu/ppc/ppc_decode_data.h
+++ b/src/xenia/cpu/ppc/ppc_decode_data.h
@@ -487,6 +487,7 @@ struct PPCDecodeData {
       return bits_.VA128l | (bits_.VA128h << 5) | (bits_.VA128H << 6);
     }
     uint32_t VB() const { return bits_.VB128l | (bits_.VB128h << 5); }
+    uint32_t VC() const { return bits_.VC; }
 
    private:
     XE_MAYBE_UNUSED
@@ -498,7 +499,8 @@ struct PPCDecodeData {
         uint32_t VD128h : 2;
         uint32_t : 1;
         uint32_t VA128h : 1;
-        uint32_t : 4;
+        uint32_t VC : 3;
+        uint32_t : 1;
         uint32_t VA128H : 1;
         uint32_t VB128l : 5;
         uint32_t VA128l : 5;
diff --git a/src/xenia/cpu/ppc/ppc_instr.h b/src/xenia/cpu/ppc/ppc_instr.h
index a65f1b638..b00fa225e 100644
--- a/src/xenia/cpu/ppc/ppc_instr.h
+++ b/src/xenia/cpu/ppc/ppc_instr.h
@@ -208,7 +208,8 @@ struct PPCOpcodeBits {
       uint32_t VD128h : 2;
       uint32_t : 1;
       uint32_t VA128h : 1;
-      uint32_t : 4;
+      uint32_t VC : 3;
+      uint32_t : 1;
       uint32_t VA128H : 1;
       uint32_t VB128l : 5;
       uint32_t VA128l : 5;