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shader/memory: Implement LDG.U8 and unaligned U8 loads

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LDG can load single bytes instead of full integers or packs of integers.
These have the advantage of loading bytes that are not aligned to 4
bytes.

To emulate these this commit gets the byte being referenced (by doing
"address & 3" and then using that to extract the byte from the loaded
integer:

result = bitfieldExtract(loaded_integer, (address % 4) * 8, 8)
This commit is contained in:
ReinUsesLisp 2019-12-18 00:36:21 -03:00
parent 8825b88a45
commit ae8d4b6c0c
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GPG key ID: 2DFC508897B39CFE
1 changed files with 32 additions and 6 deletions
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38
src/video_core/shader/decode/memory.cpp
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@ -22,7 +22,23 @@ using Tegra::Shader::Register;
namespace {
u32 GetUniformTypeElementsCount(Tegra::Shader::UniformType uniform_type) {
u32 GetLdgMemorySize(Tegra::Shader::UniformType uniform_type) {
switch (uniform_type) {
case Tegra::Shader::UniformType::UnsignedByte:
case Tegra::Shader::UniformType::Single:
return 1;
case Tegra::Shader::UniformType::Double:
return 2;
case Tegra::Shader::UniformType::Quad:
case Tegra::Shader::UniformType::UnsignedQuad:
return 4;
default:
UNIMPLEMENTED_MSG("Unimplemented size={}!", static_cast<u32>(uniform_type));
return 1;
}
}
u32 GetStgMemorySize(Tegra::Shader::UniformType uniform_type) {
switch (uniform_type) {
case Tegra::Shader::UniformType::Single:
return 1;
@ -170,7 +186,7 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
const auto [real_address_base, base_address, descriptor] =
TrackGlobalMemory(bb, instr, false);
const u32 count = GetUniformTypeElementsCount(type);
const u32 count = GetLdgMemorySize(type);
if (!real_address_base || !base_address) {
// Tracking failed, load zeroes.
for (u32 i = 0; i < count; ++i) {
@ -181,12 +197,22 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
for (u32 i = 0; i < count; ++i) {
const Node it_offset = Immediate(i * 4);
const Node real_address =
Operation(OperationCode::UAdd, NO_PRECISE, real_address_base, it_offset);
const Node gmem = MakeNode<GmemNode>(real_address, base_address, descriptor);
const Node real_address = Operation(OperationCode::UAdd, real_address_base, it_offset);
Node gmem = MakeNode<GmemNode>(real_address, base_address, descriptor);
if (type == Tegra::Shader::UniformType::UnsignedByte) {
// To handle unaligned loads get the byte used to dereferenced global memory
// and extract that byte from the loaded uint32.
Node byte = Operation(OperationCode::UBitwiseAnd, real_address, Immediate(3));
byte = Operation(OperationCode::ULogicalShiftLeft, std::move(byte), Immediate(3));
gmem = Operation(OperationCode::UBitfieldExtract, std::move(gmem), std::move(byte),
Immediate(8));
}
SetTemporary(bb, i, gmem);
}
for (u32 i = 0; i < count; ++i) {
SetRegister(bb, instr.gpr0.Value() + i, GetTemporary(i));
}
@ -276,7 +302,7 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
break;
}
const u32 count = GetUniformTypeElementsCount(type);
const u32 count = GetStgMemorySize(type);
for (u32 i = 0; i < count; ++i) {
const Node it_offset = Immediate(i * 4);
const Node real_address = Operation(OperationCode::UAdd, real_address_base, it_offset);