From 32244c097c3b18825ccaf542a0b54e22d0df6280 Mon Sep 17 00:00:00 2001
From: squidbus <175574877+squidbus@users.noreply.github.com>
Date: Fri, 29 Aug 2025 18:11:21 -0700
Subject: [PATCH] shader_recompiler: Implement V_ADD_F64 and loading 64-bit
 float from SGPR. (#3483)

---
 src/shader_recompiler/frontend/translate/translate.cpp  | 2 +-
 src/shader_recompiler/frontend/translate/translate.h    | 1 +
 src/shader_recompiler/frontend/translate/vector_alu.cpp | 8 ++++++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/shader_recompiler/frontend/translate/translate.cpp b/src/shader_recompiler/frontend/translate/translate.cpp
index ad6cf5f12..00d9768b8 100644
--- a/src/shader_recompiler/frontend/translate/translate.cpp
+++ b/src/shader_recompiler/frontend/translate/translate.cpp
@@ -367,7 +367,7 @@ T Translator::GetSrc64(const InstOperand& operand) {
         const auto value_lo = ir.GetScalarReg(IR::ScalarReg(operand.code));
         const auto value_hi = ir.GetScalarReg(IR::ScalarReg(operand.code + 1));
         if constexpr (is_float) {
-            UNREACHABLE();
+            value = ir.PackDouble2x32(ir.CompositeConstruct(value_lo, value_hi));
         } else {
             value = ir.PackUint2x32(ir.CompositeConstruct(value_lo, value_hi));
         }
diff --git a/src/shader_recompiler/frontend/translate/translate.h b/src/shader_recompiler/frontend/translate/translate.h
index fbd07c887..dad2cc829 100644
--- a/src/shader_recompiler/frontend/translate/translate.h
+++ b/src/shader_recompiler/frontend/translate/translate.h
@@ -149,6 +149,7 @@ public:
     void V_READLANE_B32(const GcnInst& inst);
     void V_WRITELANE_B32(const GcnInst& inst);
     void V_ADD_F32(const GcnInst& inst);
+    void V_ADD_F64(const GcnInst& inst);
     void V_SUB_F32(const GcnInst& inst);
     void V_SUBREV_F32(const GcnInst& inst);
     void V_MUL_F32(const GcnInst& inst);
diff --git a/src/shader_recompiler/frontend/translate/vector_alu.cpp b/src/shader_recompiler/frontend/translate/vector_alu.cpp
index f8be69523..de43eb8da 100644
--- a/src/shader_recompiler/frontend/translate/vector_alu.cpp
+++ b/src/shader_recompiler/frontend/translate/vector_alu.cpp
@@ -392,6 +392,8 @@ void Translator::EmitVectorAlu(const GcnInst& inst) {
         return V_CVT_PK_U8_F32(inst);
     case Opcode::V_LSHL_B64:
         return V_LSHL_B64(inst);
+    case Opcode::V_ADD_F64:
+        return V_ADD_F64(inst);
     case Opcode::V_ALIGNBIT_B32:
         return V_ALIGNBIT_B32(inst);
     case Opcode::V_ALIGNBYTE_B32:
@@ -435,6 +437,12 @@ void Translator::V_ADD_F32(const GcnInst& inst) {
     SetDst(inst.dst[0], ir.FPAdd(src0, src1));
 }
 
+void Translator::V_ADD_F64(const GcnInst& inst) {
+    const IR::F64 src0{GetSrc64<IR::F64>(inst.src[0])};
+    const IR::F64 src1{GetSrc64<IR::F64>(inst.src[1])};
+    SetDst64(inst.dst[0], ir.FPAdd(src0, src1));
+}
+
 void Translator::V_SUB_F32(const GcnInst& inst) {
     const IR::F32 src0{GetSrc<IR::F32>(inst.src[0])};
     const IR::F32 src1{GetSrc<IR::F32>(inst.src[1])};