shader: add BUFFER_LOAD_FORMAT_D16_X opcode

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

@@ -716,10 +716,21 @@ uint32_t FormattedLoad(ValueEmitContext& ctx, const IR::Inst& inst, const IR::Me
 			return LoadWordPrepared(ctx, inst, RebaseRawComponent(mem, 0u), resource);
 		}
 		const auto plan = PrepareFormattedMemory(ctx, inst, mem, resource, info);
-		return EmitValueOrDefaultIfCondition(
+		const auto value = EmitValueOrDefaultIfCondition(
 		    ctx.state, plan.in_bounds, TypeU32(ctx.state),
 		    FormattedOutOfBoundsValue(ctx, mem, plan, 1u),
 		    [&]() { return LoadFormattedInBounds(ctx, mem, plan, 0u); });
+		if (mem.data_bits != 16u) {
+			return value;
+		}
+		if (info.type == Format::ComponentType::Uint) {
+			return EmitUMin32(ctx.state, value, ConstantU32(ctx.state, 0xffffu));
+		}
+		if (info.type == Format::ComponentType::Sint) {
+			const auto lower = EmitSMax32(ctx.state, value, ConstantU32(ctx.state, 0xffff8000u));
+			return EmitSMin32(ctx.state, lower, ConstantU32(ctx.state, 0x7fffu));
+		}
+		return EmitConvertF16F32(ctx.state, EmitBitCastF32U32(ctx.state, value));
 	});
 }
 

src/graphics/shader/recompiler/frontend/decode/MemoryOps.cpp

@@ -63,6 +63,7 @@ constexpr MemoryOpcodeInfo MUBUF_OPCODE_LIST[] = {
     {0x50u, Opcode::BUFFER_ATOMIC_SWAP_X2, 2, 32},
     {0x59u, Opcode::BUFFER_ATOMIC_AND_X2, 2, 32},
     {0x5au, Opcode::BUFFER_ATOMIC_OR_X2, 2, 32},
+    {0x80u, Opcode::BUFFER_LOAD_FORMAT_D16_X, 1, 16, false, false, true},
     {0x84u, Opcode::BUFFER_STORE_FORMAT_D16_X, 1, 16, false, false, true},
 };
 
@@ -297,6 +298,9 @@ void DecodeMubuf(uint32_t pc, std::span<const uint32_t> code, uint32_t word_inde
 	}
 
 	DecodeVectorGpr(vdata, inst.dst);
+	if (inst.opcode == Opcode::BUFFER_LOAD_FORMAT_D16_X) {
+		inst.dst.sdwa_sel = 4u;
+	}
 	DecodeVectorGpr(vaddr, inst.src0);
 	DecodeScalarSource(srsrc * 4u, pc, inst.src1);
 	DecodeScalarSource(soffset, pc, inst.src2);

src/graphics/shader/recompiler/frontend/decode/ShaderDecoder.cpp

@@ -618,6 +618,7 @@ std::string InstructionToString(const Instruction& inst) {
 		case Opcode::BUFFER_LOAD_FORMAT_XY:
 		case Opcode::BUFFER_LOAD_FORMAT_XYZ:
 		case Opcode::BUFFER_LOAD_FORMAT_XYZW:
+		case Opcode::BUFFER_LOAD_FORMAT_D16_X:
 		case Opcode::BUFFER_STORE_FORMAT_X:
 		case Opcode::BUFFER_STORE_FORMAT_XY:
 		case Opcode::BUFFER_STORE_FORMAT_XYZ:

src/graphics/shader/recompiler/frontend/decode/ShaderDecoder.h

@@ -505,6 +505,7 @@ enum class Opcode {
 	BUFFER_LOAD_FORMAT_XY,
 	BUFFER_LOAD_FORMAT_XYZ,
 	BUFFER_LOAD_FORMAT_XYZW,
+	BUFFER_LOAD_FORMAT_D16_X,
 	BUFFER_STORE_FORMAT_X,
 	BUFFER_STORE_FORMAT_XY,
 	BUFFER_STORE_FORMAT_XYZ,

src/graphics/shader/recompiler/frontend/translate/Memory.cpp

@@ -427,7 +427,7 @@ void Translator::S_LOAD(const Decoder::Instruction& inst, bool raw) {
 void Translator::BUFFER_LOAD(const Decoder::Instruction& inst) {
 	const auto      memory = MemoryInfoFromDecoded(inst);
 	IR::ValueOpcode opcode;
-	const auto      bits = memory.data_bits;
+	const auto      bits = memory.formatted ? 32u : memory.data_bits;
 	const auto      sign = memory.data_signed;
 	switch (bits) {
 		case 8u: opcode = IR::ValueOpcode::LoadBufferU8; break;
@@ -981,6 +981,7 @@ void Translator::EmitMemory(const Decoder::Instruction& inst) {
 		case Decoder::Opcode::BUFFER_LOAD_FORMAT_XY:
 		case Decoder::Opcode::BUFFER_LOAD_FORMAT_XYZ:
 		case Decoder::Opcode::BUFFER_LOAD_FORMAT_XYZW:
+		case Decoder::Opcode::BUFFER_LOAD_FORMAT_D16_X:
 		case Decoder::Opcode::TBUFFER_LOAD_FORMAT_X:
 		case Decoder::Opcode::TBUFFER_LOAD_FORMAT_XY:
 		case Decoder::Opcode::TBUFFER_LOAD_FORMAT_XYZ: