From 8d9383cf88924a0fb71240d9fb2544a6a45a987c Mon Sep 17 00:00:00 2001
From: IndecisiveTurtle <47210458+raphaelthegreat@users.noreply.github.com>
Date: Wed, 9 Jul 2025 00:49:09 +0300
Subject: [PATCH] scalar_alu: Handle sharp moves with S_MOV_B64

This fixes unable to track sharp errors when this pattern is used in a shader
---
 src/shader_recompiler/frontend/translate/scalar_alu.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/shader_recompiler/frontend/translate/scalar_alu.cpp b/src/shader_recompiler/frontend/translate/scalar_alu.cpp
index 48f977f49..97913c128 100644
--- a/src/shader_recompiler/frontend/translate/scalar_alu.cpp
+++ b/src/shader_recompiler/frontend/translate/scalar_alu.cpp
@@ -586,6 +586,11 @@ void Translator::S_MOV(const GcnInst& inst) {
 }
 
 void Translator::S_MOV_B64(const GcnInst& inst) {
+    // Moving SGPR to SGPR is used for thread masks, like most operations, but it can also be used for moving sharps.
+    if (inst.dst[0].field == OperandField::ScalarGPR && inst.src[0].field == OperandField::ScalarGPR) {
+        ir.SetScalarReg(IR::ScalarReg(inst.dst[0].code), ir.GetScalarReg(IR::ScalarReg(inst.src[0].code)));
+        ir.SetScalarReg(IR::ScalarReg(inst.dst[0].code + 1), ir.GetScalarReg(IR::ScalarReg(inst.src[0].code + 1)));
+    }
     const IR::U1 src = [&] {
         switch (inst.src[0].field) {
         case OperandField::VccLo: