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GPU: Take into account predicated exits when performing shader control flow analysis.

master
Subv 2018-06-04 19:14:23 +07:00
parent cdd92dc692
commit d27279092f
1 changed files with 10 additions and 1 deletions
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11
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
Unescape Escape View File

@ -115,7 +115,16 @@ private:
if (const auto opcode = OpCode::Decode(instr)) {
switch (opcode->GetId()) {
case OpCode::Id::EXIT: {
return exit_method = ExitMethod::AlwaysEnd;
// The EXIT instruction can be predicated, which means that the shader can
// conditionally end on this instruction. We have to consider the case where the
// condition is not met and check the exit method of that other basic block.
using Tegra::Shader::Pred;
if (instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex)) {
return exit_method = ExitMethod::AlwaysEnd;
} else {
ExitMethod not_met = Scan(offset + 1, end, labels);
return exit_method = ParallelExit(ExitMethod::AlwaysEnd, not_met);
}
}
case OpCode::Id::BRA: {
u32 target = offset + instr.bra.GetBranchTarget();