From 6295c32e5cf1c1389c6ce2b36014bd5fba520c56 Mon Sep 17 00:00:00 2001
From: Stephen Miller <56742918+StevenMiller123@users.noreply.github.com>
Date: Tue, 25 Nov 2025 01:51:06 -0600
Subject: [PATCH] Render.Recompiler: Implement V_FLOOR_F64 (#3828)

* VectorFpRound64 decode table

Also fixed definition for V_TRUNC_F64, though I doubt that would change anything important.

* V_FLOOR_F64 implementation

Used by Just Cause 4

* Oops

Never forget your 64s
---
 src/shader_recompiler/frontend/format.cpp          | 14 ++++++++++----
 .../frontend/translate/translate.h                 |  1 +
 .../frontend/translate/vector_alu.cpp              |  7 +++++++
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/shader_recompiler/frontend/format.cpp b/src/shader_recompiler/frontend/format.cpp
index 6c4427e5f..d26873396 100644
--- a/src/shader_recompiler/frontend/format.cpp
+++ b/src/shader_recompiler/frontend/format.cpp
@@ -1837,11 +1837,17 @@ constexpr std::array<InstFormat, 71> InstructionFormatVOP1 = {{
     // 22 = V_CVT_F64_U32
     {InstClass::VectorConv, InstCategory::VectorALU, 1, 1, ScalarType::Uint32, ScalarType::Float64},
     // 23 = V_TRUNC_F64
-    {InstClass::VectorConv, InstCategory::VectorALU, 1, 1, ScalarType::Float64,
+    {InstClass::VectorFpRound64, InstCategory::VectorALU, 1, 1, ScalarType::Float64,
+     ScalarType::Float64},
+    // 24 = V_CEIL_F64
+    {InstClass::VectorFpRound64, InstCategory::VectorALU, 1, 1, ScalarType::Float64,
+     ScalarType::Float64},
+    // 25 = V_RNDNE_F64
+    {InstClass::VectorFpRound64, InstCategory::VectorALU, 1, 1, ScalarType::Float64,
+     ScalarType::Float64},
+    // 26 = V_FLOOR_F64
+    {InstClass::VectorFpRound64, InstCategory::VectorALU, 1, 1, ScalarType::Float64,
      ScalarType::Float64},
-    {},
-    {},
-    {},
     {},
     {},
     {},
diff --git a/src/shader_recompiler/frontend/translate/translate.h b/src/shader_recompiler/frontend/translate/translate.h
index ea81a8d09..f999a3e3e 100644
--- a/src/shader_recompiler/frontend/translate/translate.h
+++ b/src/shader_recompiler/frontend/translate/translate.h
@@ -201,6 +201,7 @@ public:
     void V_CVT_F32_F64(const GcnInst& inst);
     void V_CVT_F64_F32(const GcnInst& inst);
     void V_CVT_F32_UBYTE(u32 index, const GcnInst& inst);
+    void V_FLOOR_F64(const GcnInst& inst);
     void V_FRACT_F32(const GcnInst& inst);
     void V_TRUNC_F32(const GcnInst& inst);
     void V_CEIL_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 83633402c..94cefb958 100644
--- a/src/shader_recompiler/frontend/translate/vector_alu.cpp
+++ b/src/shader_recompiler/frontend/translate/vector_alu.cpp
@@ -142,6 +142,8 @@ void Translator::EmitVectorAlu(const GcnInst& inst) {
         return V_CVT_F32_UBYTE(2, inst);
     case Opcode::V_CVT_F32_UBYTE3:
         return V_CVT_F32_UBYTE(3, inst);
+    case Opcode::V_FLOOR_F64:
+        return V_FLOOR_F64(inst);
     case Opcode::V_FRACT_F32:
         return V_FRACT_F32(inst);
     case Opcode::V_TRUNC_F32:
@@ -806,6 +808,11 @@ void Translator::V_CVT_F32_UBYTE(u32 index, const GcnInst& inst) {
     SetDst(inst.dst[0], ir.ConvertUToF(32, 32, byte));
 }
 
+void Translator::V_FLOOR_F64(const GcnInst& inst) {
+    const IR::F64 src0{GetSrc64<IR::F64>(inst.src[0])};
+    SetDst64(inst.dst[0], ir.FPFloor(src0));
+}
+
 void Translator::V_FRACT_F32(const GcnInst& inst) {
     const IR::F32 src0{GetSrc<IR::F32>(inst.src[0])};
     SetDst(inst.dst[0], ir.FPFract(src0));