hdkv
/
yuzu
1
Fork 0
Code Issues Pull Requests Releases 1 Activity

early-access version 2591

main
pineappleEA 2022-03-22 23:20:20 +01:00
parent 5235709b60
commit a771dc9b88
2 changed files with 11 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
View File

@ -1,7 +1,7 @@
yuzu emulator early access
=============
This is the source code for early-access 2590.
This is the source code for early-access 2591.
## Legal Notice

71
src/shader_recompiler/ir_opt/dead_code_elimination_pass.cpp
View File

@ -7,70 +7,19 @@
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Optimization {
namespace {
template <bool TEST_USES>
void DeadInstElimination(IR::Block* const block) {
// We iterate over the instructions in reverse order.
// This is because removing an instruction reduces the number of uses for earlier instructions.
auto it{block->end()};
while (it != block->begin()) {
--it;
if constexpr (TEST_USES) {
if (it->HasUses() || it->MayHaveSideEffects()) {
continue;
}
}
it->Invalidate();
it = block->Instructions().erase(it);
}
}
void DeadBranchElimination(IR::Program& program) {
const auto begin_it{program.syntax_list.begin()};
for (auto node_it = begin_it; node_it != program.syntax_list.end(); ++node_it) {
if (node_it->type != IR::AbstractSyntaxNode::Type::If) {
continue;
}
IR::Inst* const cond_ref{node_it->data.if_node.cond.Inst()};
const IR::U1 cond{cond_ref->Arg(0)};
if (!cond.IsImmediate()) {
continue;
}
if (cond.U1()) {
continue;
}
// False immediate condition. Remove condition ref, erase the entire branch.
cond_ref->Invalidate();
// Account for nested if-statements within the if(false) branch
u32 nested_ifs{1u};
while (node_it->type != IR::AbstractSyntaxNode::Type::EndIf || nested_ifs > 0) {
node_it = program.syntax_list.erase(node_it);
switch (node_it->type) {
case IR::AbstractSyntaxNode::Type::If:
++nested_ifs;
break;
case IR::AbstractSyntaxNode::Type::EndIf:
--nested_ifs;
break;
case IR::AbstractSyntaxNode::Type::Block: {
IR::Block* const block{node_it->data.block};
DeadInstElimination<false>(block);
break;
}
default:
break;
}
}
// Erase EndIf node of the if(false) branch
node_it = program.syntax_list.erase(node_it);
}
}
} // namespace
void DeadCodeEliminationPass(IR::Program& program) {
DeadBranchElimination(program);
// We iterate over the instructions in reverse order.
// This is because removing an instruction reduces the number of uses for earlier instructions.
for (IR::Block* const block : program.post_order_blocks) {
DeadInstElimination<true>(block);
auto it{block->end()};
while (it != block->begin()) {
--it;
if (!it->HasUses() && !it->MayHaveSideEffects()) {
it->Invalidate();
it = block->Instructions().erase(it);
}
}
}
}