diff options
Diffstat (limited to '')
| -rw-r--r-- | src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp | 113 |
1 files changed, 59 insertions, 54 deletions
diff --git a/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp b/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp index 8ca996e93..7eaf719c4 100644 --- a/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp +++ b/src/shader_recompiler/ir_opt/ssa_rewrite_pass.cpp @@ -113,6 +113,7 @@ private: IR::Value ReadVariableRecursive(auto variable, IR::Block* block) { IR::Value val; if (const std::span preds{block->ImmediatePredecessors()}; preds.size() == 1) { + // Optimize the common case of one predecessor: no phi needed val = ReadVariable(variable, preds.front()); } else { // Break potential cycles with operandless phi @@ -160,66 +161,70 @@ private: DefTable current_def; }; + +void VisitInst(Pass& pass, IR::Block* block, IR::Inst& inst) { + switch (inst.Opcode()) { + case IR::Opcode::SetRegister: + if (const IR::Reg reg{inst.Arg(0).Reg()}; reg != IR::Reg::RZ) { + pass.WriteVariable(reg, block, inst.Arg(1)); + } + break; + case IR::Opcode::SetPred: + if (const IR::Pred pred{inst.Arg(0).Pred()}; pred != IR::Pred::PT) { + pass.WriteVariable(pred, block, inst.Arg(1)); + } + break; + case IR::Opcode::SetGotoVariable: + pass.WriteVariable(GotoVariable{inst.Arg(0).U32()}, block, inst.Arg(1)); + break; + case IR::Opcode::SetZFlag: + pass.WriteVariable(ZeroFlagTag{}, block, inst.Arg(0)); + break; + case IR::Opcode::SetSFlag: + pass.WriteVariable(SignFlagTag{}, block, inst.Arg(0)); + break; + case IR::Opcode::SetCFlag: + pass.WriteVariable(CarryFlagTag{}, block, inst.Arg(0)); + break; + case IR::Opcode::SetOFlag: + pass.WriteVariable(OverflowFlagTag{}, block, inst.Arg(0)); + break; + case IR::Opcode::GetRegister: + if (const IR::Reg reg{inst.Arg(0).Reg()}; reg != IR::Reg::RZ) { + inst.ReplaceUsesWith(pass.ReadVariable(reg, block)); + } + break; + case IR::Opcode::GetPred: + if (const IR::Pred pred{inst.Arg(0).Pred()}; pred != IR::Pred::PT) { + inst.ReplaceUsesWith(pass.ReadVariable(pred, block)); + } + break; + case IR::Opcode::GetGotoVariable: + inst.ReplaceUsesWith(pass.ReadVariable(GotoVariable{inst.Arg(0).U32()}, block)); + break; + case IR::Opcode::GetZFlag: + inst.ReplaceUsesWith(pass.ReadVariable(ZeroFlagTag{}, block)); + break; + case IR::Opcode::GetSFlag: + inst.ReplaceUsesWith(pass.ReadVariable(SignFlagTag{}, block)); + break; + case IR::Opcode::GetCFlag: + inst.ReplaceUsesWith(pass.ReadVariable(CarryFlagTag{}, block)); + break; + case IR::Opcode::GetOFlag: + inst.ReplaceUsesWith(pass.ReadVariable(OverflowFlagTag{}, block)); + break; + default: + break; + } +} } // Anonymous namespace void SsaRewritePass(IR::Function& function) { Pass pass; for (IR::Block* const block : function.blocks) { for (IR::Inst& inst : block->Instructions()) { - switch (inst.Opcode()) { - case IR::Opcode::SetRegister: - if (const IR::Reg reg{inst.Arg(0).Reg()}; reg != IR::Reg::RZ) { - pass.WriteVariable(reg, block, inst.Arg(1)); - } - break; - case IR::Opcode::SetPred: - if (const IR::Pred pred{inst.Arg(0).Pred()}; pred != IR::Pred::PT) { - pass.WriteVariable(pred, block, inst.Arg(1)); - } - break; - case IR::Opcode::SetGotoVariable: - pass.WriteVariable(GotoVariable{inst.Arg(0).U32()}, block, inst.Arg(1)); - break; - case IR::Opcode::SetZFlag: - pass.WriteVariable(ZeroFlagTag{}, block, inst.Arg(0)); - break; - case IR::Opcode::SetSFlag: - pass.WriteVariable(SignFlagTag{}, block, inst.Arg(0)); - break; - case IR::Opcode::SetCFlag: - pass.WriteVariable(CarryFlagTag{}, block, inst.Arg(0)); - break; - case IR::Opcode::SetOFlag: - pass.WriteVariable(OverflowFlagTag{}, block, inst.Arg(0)); - break; - case IR::Opcode::GetRegister: - if (const IR::Reg reg{inst.Arg(0).Reg()}; reg != IR::Reg::RZ) { - inst.ReplaceUsesWith(pass.ReadVariable(reg, block)); - } - break; - case IR::Opcode::GetPred: - if (const IR::Pred pred{inst.Arg(0).Pred()}; pred != IR::Pred::PT) { - inst.ReplaceUsesWith(pass.ReadVariable(pred, block)); - } - break; - case IR::Opcode::GetGotoVariable: - inst.ReplaceUsesWith(pass.ReadVariable(GotoVariable{inst.Arg(0).U32()}, block)); - break; - case IR::Opcode::GetZFlag: - inst.ReplaceUsesWith(pass.ReadVariable(ZeroFlagTag{}, block)); - break; - case IR::Opcode::GetSFlag: - inst.ReplaceUsesWith(pass.ReadVariable(SignFlagTag{}, block)); - break; - case IR::Opcode::GetCFlag: - inst.ReplaceUsesWith(pass.ReadVariable(CarryFlagTag{}, block)); - break; - case IR::Opcode::GetOFlag: - inst.ReplaceUsesWith(pass.ReadVariable(OverflowFlagTag{}, block)); - break; - default: - break; - } + VisitInst(pass, block, inst); } } } |