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get_set_elimination_pass: Refactor CPSR related eliminations

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This commit is contained in:
MerryMage 2016-11-23 18:42:13 +00:00
parent 4c817b9bd5
commit e7d02a5439
1 changed files with 18 additions and 20 deletions
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38
src/ir_opt/get_set_elimination_pass.cpp
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@ -25,10 +25,12 @@ void GetSetElimination(IR::Block& block) {
std::array<RegisterInfo, 15> reg_info;
std::array<RegisterInfo, 32> ext_reg_singles_info;
std::array<RegisterInfo, 32> ext_reg_doubles_info;
RegisterInfo n_info;
RegisterInfo z_info;
RegisterInfo c_info;
RegisterInfo v_info;
struct CpsrInfo {
RegisterInfo n;
RegisterInfo z;
RegisterInfo c;
RegisterInfo v;
} cpsr_info;
const auto do_set = [&block](RegisterInfo& info, IR::Value value, Iterator set_inst) {
if (info.set_instruction_present) {
@ -113,47 +115,43 @@ void GetSetElimination(IR::Block& block) {
break;
}
case IR::Opcode::SetNFlag: {
do_set(n_info, inst->GetArg(0), inst);
do_set(cpsr_info.n, inst->GetArg(0), inst);
break;
}
case IR::Opcode::GetNFlag: {
do_get(n_info, inst);
do_get(cpsr_info.n, inst);
break;
}
case IR::Opcode::SetZFlag: {
do_set(z_info, inst->GetArg(0), inst);
do_set(cpsr_info.z, inst->GetArg(0), inst);
break;
}
case IR::Opcode::GetZFlag: {
do_get(z_info, inst);
do_get(cpsr_info.z, inst);
break;
}
case IR::Opcode::SetCFlag: {
do_set(c_info, inst->GetArg(0), inst);
do_set(cpsr_info.c, inst->GetArg(0), inst);
break;
}
case IR::Opcode::GetCFlag: {
do_get(c_info, inst);
do_get(cpsr_info.c, inst);
break;
}
case IR::Opcode::SetVFlag: {
do_set(v_info, inst->GetArg(0), inst);
do_set(cpsr_info.v, inst->GetArg(0), inst);
break;
}
case IR::Opcode::GetVFlag: {
do_get(v_info, inst);
do_get(cpsr_info.v, inst);
break;
}
case IR::Opcode::SetCpsr:
case IR::Opcode::GetCpsr: {
n_info = {};
z_info = {};
c_info = {};
v_info = {};
default: {
if (inst->ReadsFromCPSR() || inst->WritesToCPSR()) {
cpsr_info = {};
}
break;
}
default:
break;
}
}
}