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shader_ir/memory: Ignore global memory when tracking fails

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Ignore global memory operations instead of invoking undefined behaviour
when constant buffer tracking fails and we are blasting through asserts,
ignore the operation.

In the case of LDG this means filling the destination registers with
zeroes; for STG this means ignore the instruction as a whole.

The default behaviour is still to abort execution on failure.
This commit is contained in:
ReinUsesLisp 2019-10-18 01:23:10 -03:00
parent dd2e96b362
commit 1ea07954fb
2 changed files with 26 additions and 18 deletions
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39
src/video_core/shader/decode/memory.cpp
View file

@ -166,9 +166,17 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
}();
const auto [real_address_base, base_address, descriptor] =
TrackAndGetGlobalMemory(bb, instr, false);
TrackGlobalMemory(bb, instr, false);
const u32 count = GetUniformTypeElementsCount(type);
if (!real_address_base || !base_address) {
// Tracking failed, load zeroes.
for (u32 i = 0; i < count; ++i) {
SetRegister(bb, instr.gpr0.Value() + i, Immediate(0.0f));
}
break;
}
for (u32 i = 0; i < count; ++i) {
const Node it_offset = Immediate(i * 4);
const Node real_address =
@ -260,22 +268,19 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
}();
const auto [real_address_base, base_address, descriptor] =
TrackAndGetGlobalMemory(bb, instr, true);
// Encode in temporary registers like this: real_base_address, {registers_to_be_written...}
SetTemporary(bb, 0, real_address_base);
TrackGlobalMemory(bb, instr, true);
if (!real_address_base || !base_address) {
// Tracking failed, skip the store.
break;
}
const u32 count = GetUniformTypeElementsCount(type);
for (u32 i = 0; i < count; ++i) {
SetTemporary(bb, i + 1, GetRegister(instr.gpr0.Value() + i));
}
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 real_address = Operation(OperationCode::UAdd, real_address_base, it_offset);
const Node gmem = MakeNode<GmemNode>(real_address, base_address, descriptor);
bb.push_back(Operation(OperationCode::Assign, gmem, GetTemporary(i + 1)));
const Node value = GetRegister(instr.gpr0.Value() + i);
bb.push_back(Operation(OperationCode::Assign, gmem, value));
}
break;
}
@ -301,15 +306,17 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
return pc;
}
std::tuple<Node, Node, GlobalMemoryBase> ShaderIR::TrackAndGetGlobalMemory(NodeBlock& bb,
Instruction instr,
bool is_write) {
std::tuple<Node, Node, GlobalMemoryBase> ShaderIR::TrackGlobalMemory(NodeBlock& bb,
Instruction instr,
bool is_write) {
const auto addr_register{GetRegister(instr.gmem.gpr)};
const auto immediate_offset{static_cast<u32>(instr.gmem.offset)};
const auto [base_address, index, offset] =
TrackCbuf(addr_register, global_code, static_cast<s64>(global_code.size()));
ASSERT(base_address != nullptr);
ASSERT_OR_EXECUTE_MSG(base_address != nullptr,
{ return std::make_tuple(nullptr, nullptr, GlobalMemoryBase{}); },
"Global memory tracking failed");
bb.push_back(Comment(fmt::format("Base address is c[0x{:x}][0x{:x}]", index, offset)));

5
src/video_core/shader/shader_ir.h
View file

@ -371,8 +371,9 @@ private:
std::pair<Node, s64> TrackRegister(const GprNode* tracked, const NodeBlock& code,
s64 cursor) const;
std::tuple<Node, Node, GlobalMemoryBase> TrackAndGetGlobalMemory(
NodeBlock& bb, Tegra::Shader::Instruction instr, bool is_write);
std::tuple<Node, Node, GlobalMemoryBase> TrackGlobalMemory(NodeBlock& bb,
Tegra::Shader::Instruction instr,
bool is_write);
const ProgramCode& program_code;
const u32 main_offset;