shader_recompiler: add SSA

src/graphics/shader/recompiler/backend/spirv/spirvEmitterControlFlow.cpp

@@ -0,0 +1,52 @@
+#include "graphics/shader/recompiler/backend/spirv/spirvEmitterInternal.h"
+
+#include <algorithm>
+
+namespace Libs::Graphics::ShaderRecompiler::Spirv::Emitter {
+
+bool UserDataDwordIndex(const EmitterState& state, IR::Register reg, uint32_t& dword_index) {
+	if (reg.file != IR::RegisterFile::Scalar) {
+		return false;
+	}
+	const auto& registers = state.program.bindings.user_data_registers;
+	const auto  found     = std::lower_bound(registers.begin(), registers.end(), reg.index);
+	if (found == registers.end() || *found != reg.index) {
+		return false;
+	}
+	dword_index = static_cast<uint32_t>(found - registers.begin());
+	return true;
+}
+
+uint32_t EmitShaderDataDwordLoad(EmitterState& state, uint32_t dword_index) {
+	if (state.push_constant_variable != 0) {
+		const auto pointer = state.builder.AllocateId();
+		const auto value   = state.builder.AllocateId();
+		state.builder.AddFunction({OpAccessChain, state.ptr_push_constant_uint, pointer,
+		                           state.push_constant_variable, ConstantU32(state, 0),
+		                           ConstantU32(state, dword_index)});
+		state.builder.AddFunction({OpLoad, state.uint_type, value, pointer});
+		return value;
+	}
+	if (state.vsharp_storage_variable != 0) {
+		const auto pointer = state.builder.AllocateId();
+		const auto value   = state.builder.AllocateId();
+		state.builder.AddFunction({OpAccessChain, state.ptr_storage_buffer_uint, pointer,
+		                           state.vsharp_storage_variable, ConstantU32(state, 0),
+		                           ConstantU32(state, dword_index)});
+		state.builder.AddFunction({OpLoad, state.uint_type, value, pointer});
+		return value;
+	}
+	return ConstantU32(state, 0);
+}
+
+uint32_t InitialRegisterValue(const EmitterState& state, IR::Register reg) {
+	if (reg.file != IR::RegisterFile::Exec) {
+		return 0;
+	}
+	if (state.per_invocation_masks) {
+		return reg.index == 0 ? 1u : 0u;
+	}
+	return reg.index == 0 || state.wave_size == 64u ? 0xffffffffu : 0u;
+}
+
+} // namespace Libs::Graphics::ShaderRecompiler::Spirv::Emitter