Add support for OpDot

src/Pipeline/SpirvShader.cpp

@@ -235,6 +235,7 @@ namespace sw
 			case spv::OpLogicalAnd:
 			case spv::OpUMulExtended:
 			case spv::OpSMulExtended:
+			case spv::OpDot:
 				// Instructions that yield an intermediate value
 			{
 				TypeID typeId = insn.word(1);
@@ -914,6 +915,10 @@ namespace sw
 				EmitBinaryOp(insn, routine);
 				break;
 
+			case spv::OpDot:
+				EmitDot(insn, routine);
+				break;
+
 			default:
 				printf("emit: ignoring opcode %s\n", OpcodeName(insn.opcode()).c_str());
 				break;
@@ -1279,6 +1284,25 @@ namespace sw
 		}
 	}
 
+	void SpirvShader::EmitDot(InsnIterator insn, SpirvRoutine *routine) const
+	{
+		auto &type = getType(insn.word(1));
+		assert(type.sizeInComponents == 1);
+		auto &dst = routine->createIntermediate(insn.word(2), type.sizeInComponents);
+		auto &lhsType = getType(getObject(insn.word(3)).type);
+		auto srcLHS = GenericValue(this, routine, insn.word(3));
+		auto srcRHS = GenericValue(this, routine, insn.word(4));
+
+		SIMD::Float result = srcLHS[0] * srcRHS[0];
+
+		for (auto i = 1u; i < lhsType.sizeInComponents; i++)
+		{
+			result += srcLHS[i] * srcRHS[i];
+		}
+
+		dst.emplace(0, result);
+	}
+
 	void SpirvShader::emitEpilog(SpirvRoutine *routine) const
 	{
 		for (auto insn : *this)

src/Pipeline/SpirvShader.hpp

@@ -402,6 +402,7 @@ namespace sw
 		void EmitVectorShuffle(InsnIterator insn, SpirvRoutine *routine) const;
 		void EmitUnaryOp(InsnIterator insn, SpirvRoutine *routine) const;
 		void EmitBinaryOp(InsnIterator insn, SpirvRoutine *routine) const;
+		void EmitDot(InsnIterator insn, SpirvRoutine *routine) const;
 
 		// OpcodeName returns the name of the opcode op.
 		// If NDEBUG is defined, then OpcodeName will only return the numerical code.