From 8810c88b7e3de2766bf47e07e941fb2c58c6b4b0 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Wed, 24 Feb 2021 20:31:15 -0500
Subject: shader: Implement SEL

---
 src/shader_recompiler/CMakeLists.txt               |  1 +
 .../maxwell/translate/impl/not_implemented.cpp     | 12 ------
 .../impl/select_source_with_predicate.cpp          | 44 ++++++++++++++++++++++
 src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp  | 12 ++++--
 4 files changed, 53 insertions(+), 16 deletions(-)
 create mode 100644 src/shader_recompiler/frontend/maxwell/translate/impl/select_source_with_predicate.cpp

(limited to 'src/shader_recompiler')

diff --git a/src/shader_recompiler/CMakeLists.txt b/src/shader_recompiler/CMakeLists.txt
index 5574feaa6..17ccb3d98 100644
--- a/src/shader_recompiler/CMakeLists.txt
+++ b/src/shader_recompiler/CMakeLists.txt
@@ -79,6 +79,7 @@ add_library(shader_recompiler STATIC
     frontend/maxwell/translate/impl/move_register.cpp
     frontend/maxwell/translate/impl/move_special_register.cpp
     frontend/maxwell/translate/impl/not_implemented.cpp
+    frontend/maxwell/translate/impl/select_source_with_predicate.cpp
     frontend/maxwell/translate/translate.cpp
     frontend/maxwell/translate/translate.h
     ir_opt/collect_shader_info_pass.cpp
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
index 3f6dedfdd..82c73bf8c 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
@@ -729,18 +729,6 @@ void TranslatorVisitor::SAM(u64) {
     ThrowNotImplemented(Opcode::SAM);
 }
 
-void TranslatorVisitor::SEL_reg(u64) {
-    ThrowNotImplemented(Opcode::SEL_reg);
-}
-
-void TranslatorVisitor::SEL_cbuf(u64) {
-    ThrowNotImplemented(Opcode::SEL_cbuf);
-}
-
-void TranslatorVisitor::SEL_imm(u64) {
-    ThrowNotImplemented(Opcode::SEL_imm);
-}
-
 void TranslatorVisitor::SETCRSPTR(u64) {
     ThrowNotImplemented(Opcode::SETCRSPTR);
 }
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/select_source_with_predicate.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/select_source_with_predicate.cpp
new file mode 100644
index 000000000..25fc6b437
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/select_source_with_predicate.cpp
@@ -0,0 +1,44 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+namespace {
+
+void SEL(TranslatorVisitor& v, u64 insn, const IR::U32& src) {
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> op_a;
+        BitField<39, 3, IR::Pred> pred;
+        BitField<42, 1, u64> neg_pred;
+    } const sel{insn};
+
+    const IR::U1 pred = v.ir.GetPred(sel.pred);
+    IR::U32 op_a{v.X(sel.op_a)};
+    IR::U32 op_b{src};
+    if (sel.neg_pred != 0) {
+        std::swap(op_a, op_b);
+    }
+    const IR::U32 result{v.ir.Select(pred, op_a, op_b)};
+
+    v.X(sel.dest_reg, result);
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::SEL_reg(u64 insn) {
+    SEL(*this, insn, GetReg20(insn));
+}
+
+void TranslatorVisitor::SEL_cbuf(u64 insn) {
+    SEL(*this, insn, GetCbuf(insn));
+}
+
+void TranslatorVisitor::SEL_imm(u64 insn) {
+    SEL(*this, insn, GetImm20(insn));
+}
+} // namespace Shader::Maxwell
diff --git a/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp b/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp
index 13f9c914a..19d35b1f8 100644
--- a/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp
+++ b/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp
@@ -109,11 +109,13 @@ IR::Opcode UndefOpcode(const FlagTag&) noexcept {
 
 class Pass {
 public:
-    void WriteVariable(auto variable, IR::Block* block, const IR::Value& value) {
+    template <typename Type>
+    void WriteVariable(Type variable, IR::Block* block, const IR::Value& value) {
         current_def[variable].insert_or_assign(block, value);
     }
 
-    IR::Value ReadVariable(auto variable, IR::Block* block) {
+    template <typename Type>
+    IR::Value ReadVariable(Type variable, IR::Block* block) {
         const ValueMap& def{current_def[variable]};
         if (const auto it{def.find(block)}; it != def.end()) {
             return it->second;
@@ -132,7 +134,8 @@ public:
     }
 
 private:
-    IR::Value ReadVariableRecursive(auto variable, IR::Block* block) {
+    template <typename Type>
+    IR::Value ReadVariableRecursive(Type variable, IR::Block* block) {
         IR::Value val;
         if (!sealed_blocks.contains(block)) {
             // Incomplete CFG
@@ -154,7 +157,8 @@ private:
         return val;
     }
 
-    IR::Value AddPhiOperands(auto variable, IR::Inst& phi, IR::Block* block) {
+    template <typename Type>
+    IR::Value AddPhiOperands(Type variable, IR::Inst& phi, IR::Block* block) {
         for (IR::Block* const imm_pred : block->ImmediatePredecessors()) {
             phi.AddPhiOperand(imm_pred, ReadVariable(variable, imm_pred));
         }
-- 
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