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structured_control_flow: Skip reordering nested demote branches.

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Nested demote branches add complexity with combining the condition if it has not been initialized yet. Skip them for the time being.
This commit is contained in:
ameerj 2021-08-25 14:26:49 -04:00
parent 4fda7f1c82
commit 907dfbea71
1 changed files with 11 additions and 0 deletions
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11
src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp
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@ -872,10 +872,21 @@ private:
std::vector<IR::Block*> demote_blocks; std::vector<IR::Block*> demote_blocks;
std::vector<IR::U1> demote_conds; std::vector<IR::U1> demote_conds;
u32 num_epilogues{}; u32 num_epilogues{};
u32 branch_depth{};
for (const IR::AbstractSyntaxNode& node : syntax_list) { for (const IR::AbstractSyntaxNode& node : syntax_list) {
if (node.type == Type::If) {
++branch_depth;
}
if (node.type == Type::EndIf) {
--branch_depth;
}
if (node.type != Type::Block) { if (node.type != Type::Block) {
continue; continue;
} }
if (branch_depth > 1) {
// Skip reordering nested demote branches.
continue;
}
for (const IR::Inst& inst : node.data.block->Instructions()) { for (const IR::Inst& inst : node.data.block->Instructions()) {
const IR::Opcode op{inst.GetOpcode()}; const IR::Opcode op{inst.GetOpcode()};
if (op == IR::Opcode::DemoteToHelperInvocation) { if (op == IR::Opcode::DemoteToHelperInvocation) {