Merge pull request #1164 from tech4me/decode_iadd3

Shaders: Added decodings for IADD3 instructions

src/video_core/engines/shader_bytecode.h

@@ -636,6 +636,9 @@ public:
         IADD_C,
         IADD_R,
         IADD_IMM,
+        IADD3_C,
+        IADD3_R,
+        IADD3_IMM,
         IADD32I,
         ISCADD_C, // Scale and Add
         ISCADD_R,
@@ -854,6 +857,9 @@ private:
             INST("0100110000010---", Id::IADD_C, Type::ArithmeticInteger, "IADD_C"),
             INST("0101110000010---", Id::IADD_R, Type::ArithmeticInteger, "IADD_R"),
             INST("0011100-00010---", Id::IADD_IMM, Type::ArithmeticInteger, "IADD_IMM"),
+            INST("010011001100----", Id::IADD3_C, Type::ArithmeticInteger, "IADD3_C"),
+            INST("010111001100----", Id::IADD3_R, Type::ArithmeticInteger, "IADD3_R"),
+            INST("0011100-1100----", Id::IADD3_IMM, Type::ArithmeticInteger, "IADD3_IMM"),
             INST("0001110---------", Id::IADD32I, Type::ArithmeticIntegerImmediate, "IADD32I"),
             INST("0100110000011---", Id::ISCADD_C, Type::ArithmeticInteger, "ISCADD_C"),
             INST("0101110000011---", Id::ISCADD_R, Type::ArithmeticInteger, "ISCADD_R"),