Shader_IR: Implement ICMP.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/video_core/shader/decode/arithmetic_integer.cpp b/src/video_core/shader/decode/arithmetic_integer.cpp
index c8c1a7f409..1aa21010ab 100644
--- a/src/video_core/shader/decode/arithmetic_integer.cpp
+++ b/src/video_core/shader/decode/arithmetic_integer.cpp
@@ -138,6 +138,32 @@ u32 ShaderIR::DecodeArithmeticInteger(NodeBlock& bb, u32 pc) {
         SetRegister(bb, instr.gpr0, value);
         break;
     }
+    case OpCode::Id::ICMP_CR:
+    case OpCode::Id::ICMP_R:
+    case OpCode::Id::ICMP_RC: {
+        UNIMPLEMENTED_IF(instr.icmp.is_signed != 0);
+        const Node zero = Immediate(0);
+
+        const auto [op_a, op_b] = [&]() -> std::tuple<Node, Node> {
+            switch (opcode->get().GetId()) {
+            case OpCode::Id::ICMP_CR:
+                return {GetConstBuffer(instr.cbuf34.index, instr.cbuf34.offset),
+                        GetRegister(instr.gpr39)};
+            case OpCode::Id::ICMP_R:
+                return {GetRegister(instr.gpr20), GetRegister(instr.gpr39)};
+            case OpCode::Id::ICMP_RC:
+                return {GetRegister(instr.gpr39),
+                        GetConstBuffer(instr.cbuf34.index, instr.cbuf34.offset)};
+            default:
+                UNIMPLEMENTED();
+                return {zero, zero};
+            }
+        }();
+        const Node test = GetRegister(instr.gpr8);
+        const Node comparison = GetPredicateComparisonInteger(instr.icmp.cond, false, test, zero);
+        SetRegister(bb, instr.gpr0, Operation(OperationCode::Select, comparison, op_a, op_b));
+        break;
+    }
     case OpCode::Id::LOP_C:
     case OpCode::Id::LOP_R:
     case OpCode::Id::LOP_IMM: {