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Implement some simple IR optimizations (get/set eliminiation and DCE)

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This commit is contained in:
MerryMage
2016-07-21 21:48:45 +01:00
parent 90d317b868
commit 5fbfc6c155
16 changed files with 544 additions and 300 deletions
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10
src/backend_x64/reg_alloc.cpp
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@@ -141,10 +141,13 @@ Gen::X64Reg RegAlloc::UseScratchRegister(IR::Value* use_value, std::initializer_
if (IsRegisterOccupied(new_location)) {
SpillRegister(new_location);
if (current_location != new_location) {
code->MOV(32, Gen::R(hostloc_to_x64.at(new_location)), Gen::R(hostloc_to_x64.at(current_location)));
}
} else {
code->MOV(32, Gen::R(hostloc_to_x64.at(new_location)), Gen::R(hostloc_to_x64.at(current_location)));
}
code->MOV(32, Gen::R(hostloc_to_x64.at(new_location)), Gen::R(hostloc_to_x64.at(current_location)));
hostloc_state[new_location] = HostLocState::Scratch;
remaining_uses[use_value]--;
} else {
@@ -203,6 +206,9 @@ void RegAlloc::HostCall(IR::Value* result_def, IR::Value* arg0_use, IR::Value* a
ScratchRegister({AbiArgs[i]});
}
}
ScratchRegister({HostLoc::RSP});
code->MOV(64, Gen::R(Gen::RSP), Gen::MDisp(Gen::R15, offsetof(JitState, save_host_RSP)));
}
HostLoc RegAlloc::SelectARegister(std::initializer_list<HostLoc> desired_locations) const {