From c23c30c76f2195beb34fea628ba66dc41e39fcfd Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Mon, 4 Jun 2018 22:15:19 -0400
Subject: gl_shader_decompiler: Implement SHL instruction.

---
 src/video_core/engines/shader_bytecode.h           | 30 ++++++++++++---------
 .../renderer_opengl/gl_shader_decompiler.cpp       | 31 +++++++++++++++++++++-
 2 files changed, 47 insertions(+), 14 deletions(-)

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index 8d4ea3401..ef749937e 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -230,22 +230,19 @@ union Instruction {
             std::memcpy(&result, &imm, sizeof(imm));
             return result;
         }
-    } alu;
-
-    union {
-        BitField<39, 5, u64> shift_amount;
-        BitField<20, 19, u64> immediate_low;
-        BitField<56, 1, u64> immediate_high;
-        BitField<48, 1, u64> negate_b;
-        BitField<49, 1, u64> negate_a;
 
-        s32 GetImmediate() const {
-            u32 immediate = static_cast<u32>(immediate_low | (immediate_high << 19));
+        s32 GetSignedImm20_20() const {
+            u32 immediate = static_cast<u32>(imm20_19 | (negate_imm << 19));
             // Sign extend the 20-bit value.
             u32 mask = 1U << (20 - 1);
             return static_cast<s32>((immediate ^ mask) - mask);
         }
+    } alu;
 
+    union {
+        BitField<39, 5, u64> shift_amount;
+        BitField<48, 1, u64> negate_b;
+        BitField<49, 1, u64> negate_a;
     } iscadd;
 
     union {
@@ -402,6 +399,9 @@ public:
         MOV_R,
         MOV_IMM,
         MOV32_IMM,
+        SHL_C,
+        SHL_R,
+        SHL_IMM,
         SHR_C,
         SHR_R,
         SHR_IMM,
@@ -424,6 +424,7 @@ public:
         Trivial,
         Arithmetic,
         Logic,
+        Shift,
         ScaledAdd,
         Ffma,
         Flow,
@@ -565,13 +566,16 @@ private:
             INST("0101110010011---", Id::MOV_R, Type::Arithmetic, "MOV_R"),
             INST("0011100-10011---", Id::MOV_IMM, Type::Arithmetic, "MOV_IMM"),
             INST("000000010000----", Id::MOV32_IMM, Type::Arithmetic, "MOV32_IMM"),
-            INST("0100110000101---", Id::SHR_C, Type::Arithmetic, "SHR_C"),
-            INST("0101110000101---", Id::SHR_R, Type::Arithmetic, "SHR_R"),
-            INST("0011100-00101---", Id::SHR_IMM, Type::Arithmetic, "SHR_IMM"),
             INST("0100110001100---", Id::FMNMX_C, Type::Arithmetic, "FMNMX_C"),
             INST("0101110001100---", Id::FMNMX_R, Type::Arithmetic, "FMNMX_R"),
             INST("0011100-01100---", Id::FMNMX_IMM, Type::Arithmetic, "FMNMX_IMM"),
             INST("000001----------", Id::LOP32I, Type::Logic, "LOP32I"),
+            INST("0100110001001---", Id::SHL_C, Type::Shift, "SHL_C"),
+            INST("0101110001001---", Id::SHL_R, Type::Shift, "SHL_R"),
+            INST("0011100-01001---", Id::SHL_IMM, Type::Shift, "SHL_IMM"),
+            INST("0100110000101---", Id::SHR_C, Type::Shift, "SHR_C"),
+            INST("0101110000101---", Id::SHR_R, Type::Shift, "SHR_R"),
+            INST("0011100-00101---", Id::SHR_IMM, Type::Shift, "SHR_IMM"),
             INST("0100110011100---", Id::I2I_C, Type::Conversion, "I2I_C"),
             INST("0101110011100---", Id::I2I_R, Type::Conversion, "I2I_R"),
             INST("01110001-1000---", Id::I2I_IMM, Type::Conversion, "I2I_IMM"),
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index 6f66dfbcd..2c9ffcafc 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -884,6 +884,35 @@ private:
             }
             break;
         }
+
+        case OpCode::Type::Shift: {
+            std::string op_a = regs.GetRegisterAsInteger(instr.gpr8, 0, false);
+            std::string op_b;
+
+            if (instr.is_b_imm) {
+                op_b += '(' + std::to_string(instr.alu.GetSignedImm20_20()) + ')';
+            } else {
+                if (instr.is_b_gpr) {
+                    op_b += regs.GetRegisterAsInteger(instr.gpr20);
+                } else {
+                    op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Integer);
+                }
+            }
+
+            switch (opcode->GetId()) {
+            case OpCode::Id::SHL_C:
+            case OpCode::Id::SHL_R:
+            case OpCode::Id::SHL_IMM:
+                regs.SetRegisterToInteger(instr.gpr0, true, 0, op_a + " << " + op_b, 1, 1);
+                break;
+            default: {
+                NGLOG_CRITICAL(HW_GPU, "Unhandled shift instruction: {}", opcode->GetName());
+                UNREACHABLE();
+            }
+            }
+            break;
+        }
+
         case OpCode::Type::ScaledAdd: {
             std::string op_a = regs.GetRegisterAsInteger(instr.gpr8);
 
@@ -893,7 +922,7 @@ private:
             std::string op_b = instr.iscadd.negate_b ? "-" : "";
 
             if (instr.is_b_imm) {
-                op_b += '(' + std::to_string(instr.iscadd.GetImmediate()) + ')';
+                op_b += '(' + std::to_string(instr.alu.GetSignedImm20_20()) + ')';
             } else {
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsInteger(instr.gpr20);
-- 
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