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shader_recompilers: Improvements to SSA phi generation and lane instruction elimination (#1667)

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* shader_recompiler: Add use tracking for Insts

* ssa_rewrite: Recursively remove phis

* ssa_rewrite: Correct recursive trivial phi elimination

* ir: Improve read lane folding pass

* control_flow: Avoid adding unnecessary divergant blocks

* clang format

* externals: Update ext-boost

---------

Co-authored-by: Frodo Baggins <baggins31084@proton.me>
This commit is contained in:
TheTurtle 2024-12-05 23:14:16 +02:00 • committed by GitHub
parent 874508f8c2
commit 22a2741ea0
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GPG key ID: B5690EEEBB952194
10 changed files with 175 additions and 76 deletions
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43
src/shader_recompiler/frontend/control_flow_graph.cpp
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@ -47,6 +47,15 @@ static IR::Condition MakeCondition(const GcnInst& inst) {
}
}
static bool IgnoresExecMask(Opcode opcode) {
switch (opcode) {
case Opcode::V_WRITELANE_B32:
return true;
default:
return false;
}
}
static constexpr size_t LabelReserveSize = 32;
CFG::CFG(Common::ObjectPool<Block>& block_pool_, std::span<const GcnInst> inst_list_)
@ -133,20 +142,26 @@ void CFG::EmitDivergenceLabels() {
curr_begin = -1;
continue;
}
// Add a label to the instruction right after the open scope call.
// It is the start of a new basic block.
const auto& save_inst = inst_list[curr_begin];
const Label label = index_to_pc[curr_begin] + save_inst.length;
AddLabel(label);
// Add a label to the close scope instruction.
// There are 3 cases where we need to close a scope.
// * Close scope instruction inside the block
// * Close scope instruction at the end of the block (cbranch or endpgm)
// * Normal instruction at the end of the block
// For the last case we must NOT add a label as that would cause
// the instruction to be separated into its own basic block.
if (is_close) {
AddLabel(index_to_pc[index]);
// If all instructions in the scope ignore exec masking, we shouldn't insert a
// scope.
const auto start = inst_list.begin() + curr_begin + 1;
if (!std::ranges::all_of(start, inst_list.begin() + index, IgnoresExecMask,
&GcnInst::opcode)) {
// Add a label to the instruction right after the open scope call.
// It is the start of a new basic block.
const auto& save_inst = inst_list[curr_begin];
const Label label = index_to_pc[curr_begin] + save_inst.length;
AddLabel(label);
// Add a label to the close scope instruction.
// There are 3 cases where we need to close a scope.
// * Close scope instruction inside the block
// * Close scope instruction at the end of the block (cbranch or endpgm)
// * Normal instruction at the end of the block
// For the last case we must NOT add a label as that would cause
// the instruction to be separated into its own basic block.
if (is_close) {
AddLabel(index_to_pc[index]);
}
}
// Reset scope begin.
curr_begin = -1;