From 6adc824d9d15b476320739788564023f995b9da0 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 21 Jul 2020 00:29:23 -0400
Subject: video_core: Allow copy elision to take place where applicable

Removes const from some variables that are returned from functions, as
this allows the move assignment/constructors to execute for them.
---
 src/video_core/shader/decode/arithmetic_integer.cpp |  6 +++---
 src/video_core/shader/decode/video.cpp              | 19 +++++++++----------
 src/video_core/shader/decode/xmad.cpp               | 15 ++++++++-------
 3 files changed, 20 insertions(+), 20 deletions(-)

(limited to 'src/video_core/shader/decode')

diff --git a/src/video_core/shader/decode/arithmetic_integer.cpp b/src/video_core/shader/decode/arithmetic_integer.cpp
index a041519b7..73155966f 100644
--- a/src/video_core/shader/decode/arithmetic_integer.cpp
+++ b/src/video_core/shader/decode/arithmetic_integer.cpp
@@ -98,12 +98,12 @@ u32 ShaderIR::DecodeArithmeticInteger(NodeBlock& bb, u32 pc) {
         op_b = GetOperandAbsNegInteger(op_b, false, instr.iadd3.neg_b, true);
         op_c = GetOperandAbsNegInteger(op_c, false, instr.iadd3.neg_c, true);
 
-        const Node value = [&]() {
-            const Node add_ab = Operation(OperationCode::IAdd, NO_PRECISE, op_a, op_b);
+        const Node value = [&] {
+            Node add_ab = Operation(OperationCode::IAdd, NO_PRECISE, op_a, op_b);
             if (opcode->get().GetId() != OpCode::Id::IADD3_R) {
                 return Operation(OperationCode::IAdd, NO_PRECISE, add_ab, op_c);
             }
-            const Node shifted = [&]() {
+            const Node shifted = [&] {
                 switch (instr.iadd3.mode) {
                 case Tegra::Shader::IAdd3Mode::RightShift:
                     // TODO(tech4me): According to
diff --git a/src/video_core/shader/decode/video.cpp b/src/video_core/shader/decode/video.cpp
index 64ba60ea2..1c0957277 100644
--- a/src/video_core/shader/decode/video.cpp
+++ b/src/video_core/shader/decode/video.cpp
@@ -91,29 +91,28 @@ u32 ShaderIR::DecodeVideo(NodeBlock& bb, u32 pc) {
     return pc;
 }
 
-Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed,
-                               Tegra::Shader::VideoType type, u64 byte_height) {
+Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed, VideoType type,
+                               u64 byte_height) {
     if (!is_chunk) {
         return BitfieldExtract(op, static_cast<u32>(byte_height * 8), 8);
     }
-    const Node zero = Immediate(0);
 
     switch (type) {
-    case Tegra::Shader::VideoType::Size16_Low:
+    case VideoType::Size16_Low:
         return BitfieldExtract(op, 0, 16);
-    case Tegra::Shader::VideoType::Size16_High:
+    case VideoType::Size16_High:
         return BitfieldExtract(op, 16, 16);
-    case Tegra::Shader::VideoType::Size32:
+    case VideoType::Size32:
         // TODO(Rodrigo): From my hardware tests it becomes a bit "mad" when this type is used
         // (1 * 1 + 0 == 0x5b800000). Until a better explanation is found: abort.
         UNIMPLEMENTED();
-        return zero;
-    case Tegra::Shader::VideoType::Invalid:
+        return Immediate(0);
+    case VideoType::Invalid:
         UNREACHABLE_MSG("Invalid instruction encoding");
-        return zero;
+        return Immediate(0);
     default:
         UNREACHABLE();
-        return zero;
+        return Immediate(0);
     }
 }
 
diff --git a/src/video_core/shader/decode/xmad.cpp b/src/video_core/shader/decode/xmad.cpp
index c83dc6615..233b8fa42 100644
--- a/src/video_core/shader/decode/xmad.cpp
+++ b/src/video_core/shader/decode/xmad.cpp
@@ -81,20 +81,21 @@ u32 ShaderIR::DecodeXmad(NodeBlock& bb, u32 pc) {
     SetTemporary(bb, 0, product);
     product = GetTemporary(0);
 
-    const Node original_c = op_c;
+    Node original_c = op_c;
     const Tegra::Shader::XmadMode set_mode = mode; // Workaround to clang compile error
-    op_c = [&]() {
+    op_c = [&] {
         switch (set_mode) {
         case Tegra::Shader::XmadMode::None:
             return original_c;
         case Tegra::Shader::XmadMode::CLo:
-            return BitfieldExtract(original_c, 0, 16);
+            return BitfieldExtract(std::move(original_c), 0, 16);
         case Tegra::Shader::XmadMode::CHi:
-            return BitfieldExtract(original_c, 16, 16);
+            return BitfieldExtract(std::move(original_c), 16, 16);
         case Tegra::Shader::XmadMode::CBcc: {
-            const Node shifted_b = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed_b,
-                                                   original_b, Immediate(16));
-            return SignedOperation(OperationCode::IAdd, is_signed_c, original_c, shifted_b);
+            Node shifted_b = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed_b,
+                                             original_b, Immediate(16));
+            return SignedOperation(OperationCode::IAdd, is_signed_c, std::move(original_c),
+                                   std::move(shifted_b));
         }
         case Tegra::Shader::XmadMode::CSfu: {
             const Node comp_a =
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