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shader: Initial implementation of an AST

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This commit is contained in:
ReinUsesLisp 2021-02-11 16:39:06 -03:00 • committed by ameerj
parent 2930dccecc
commit 9170200a11
33 changed files with 1347 additions and 591 deletions
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50
src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
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@ -132,6 +132,32 @@ void FoldLogicalAnd(IR::Inst& inst) {
}
}
void FoldLogicalOr(IR::Inst& inst) {
if (!FoldCommutative(inst, [](bool a, bool b) { return a || b; })) {
return;
}
const IR::Value rhs{inst.Arg(1)};
if (rhs.IsImmediate()) {
if (rhs.U1()) {
inst.ReplaceUsesWith(IR::Value{true});
} else {
inst.ReplaceUsesWith(inst.Arg(0));
}
}
}
void FoldLogicalNot(IR::Inst& inst) {
const IR::U1 value{inst.Arg(0)};
if (value.IsImmediate()) {
inst.ReplaceUsesWith(IR::Value{!value.U1()});
return;
}
IR::Inst* const arg{value.InstRecursive()};
if (arg->Opcode() == IR::Opcode::LogicalNot) {
inst.ReplaceUsesWith(arg->Arg(0));
}
}
template <typename Dest, typename Source>
void FoldBitCast(IR::Inst& inst, IR::Opcode reverse) {
const IR::Value value{inst.Arg(0)};
@ -160,6 +186,24 @@ void FoldWhenAllImmediates(IR::Inst& inst, Func&& func) {
inst.ReplaceUsesWith(EvalImmediates(inst, func, Indices{}));
}
void FoldBranchConditional(IR::Inst& inst) {
const IR::U1 cond{inst.Arg(0)};
if (cond.IsImmediate()) {
// TODO: Convert to Branch
return;
}
const IR::Inst* cond_inst{cond.InstRecursive()};
if (cond_inst->Opcode() == IR::Opcode::LogicalNot) {
const IR::Value true_label{inst.Arg(1)};
const IR::Value false_label{inst.Arg(2)};
// Remove negation on the conditional (take the parameter out of LogicalNot) and swap
// the branches
inst.SetArg(0, cond_inst->Arg(0));
inst.SetArg(1, false_label);
inst.SetArg(2, true_label);
}
}
void ConstantPropagation(IR::Inst& inst) {
switch (inst.Opcode()) {
case IR::Opcode::GetRegister:
@ -178,6 +222,10 @@ void ConstantPropagation(IR::Inst& inst) {
return FoldSelect<u32>(inst);
case IR::Opcode::LogicalAnd:
return FoldLogicalAnd(inst);
case IR::Opcode::LogicalOr:
return FoldLogicalOr(inst);
case IR::Opcode::LogicalNot:
return FoldLogicalNot(inst);
case IR::Opcode::ULessThan:
return FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a < b; });
case IR::Opcode::BitFieldUExtract:
@ -188,6 +236,8 @@ void ConstantPropagation(IR::Inst& inst) {
}
return (base >> shift) & ((1U << count) - 1);
});
case IR::Opcode::BranchConditional:
return FoldBranchConditional(inst);
default:
break;
}