reg_alloc: Reimplement UseScratchHostLocReg
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e1d8238c50
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9518bbe06e
2 changed files with 20 additions and 31 deletions
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@ -182,40 +182,22 @@ HostLoc RegAlloc::UseScratchHostLocReg(IR::Value use_value, HostLocList desired_
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}
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HostLoc RegAlloc::UseScratchHostLocReg(IR::Inst* use_inst, HostLocList desired_locations) {
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DEBUG_ASSERT(std::all_of(desired_locations.begin(), desired_locations.end(), HostLocIsRegister));
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DEBUG_ASSERT_MSG(ValueLocation(use_inst), "use_inst has not been defined");
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ASSERT_MSG(use_inst->HasUses(), "use_inst ran out of uses. (Use-d an IR::Inst* too many times)");
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use_inst->DecrementRemainingUses();
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HostLoc current_location = *ValueLocation(use_inst);
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HostLoc new_location = SelectARegister(desired_locations);
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if (IsRegisterOccupied(new_location)) {
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SpillRegister(new_location);
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const HostLoc current_location = *ValueLocation(use_inst);
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const bool can_use_current_location = std::find(desired_locations.begin(), desired_locations.end(), current_location) != desired_locations.end();
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if (can_use_current_location && !LocInfo(current_location).IsLocked()) {
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MoveOutOfTheWay(current_location);
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LocInfo(current_location).Lock();
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return current_location;
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}
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if (HostLocIsSpill(current_location)) {
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EmitMove(code, new_location, current_location);
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LocInfo(new_location).Lock();
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use_inst->DecrementRemainingUses();
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DEBUG_ASSERT(LocInfo(new_location).IsScratch());
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return new_location;
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} else if (HostLocIsRegister(current_location)) {
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ASSERT(LocInfo(current_location).IsIdle()
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|| LocInfo(current_location).IsUse());
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if (current_location != new_location) {
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EmitMove(code, new_location, current_location);
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} else {
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ASSERT(LocInfo(current_location).IsIdle());
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}
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LocInfo(new_location) = {};
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LocInfo(new_location).Lock();
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use_inst->DecrementRemainingUses();
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DEBUG_ASSERT(LocInfo(new_location).IsScratch());
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return new_location;
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}
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ASSERT_MSG(false, "Invalid current_location");
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const HostLoc destination_location = SelectARegister(desired_locations);
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MoveOutOfTheWay(destination_location);
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CopyToScratch(destination_location, current_location);
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LocInfo(destination_location).Lock();
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return destination_location;
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}
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HostLoc RegAlloc::ScratchHostLocReg(HostLocList desired_locations) {
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@ -418,6 +400,12 @@ void RegAlloc::Move(HostLoc to, HostLoc from) {
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EmitMove(code, to, from);
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}
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void RegAlloc::CopyToScratch(HostLoc to, HostLoc from) {
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ASSERT(LocInfo(to).IsEmpty() && !LocInfo(from).IsEmpty());
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EmitMove(code, to, from);
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}
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void RegAlloc::Exchange(HostLoc a, HostLoc b) {
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ASSERT(!LocInfo(a).IsLocked() && !LocInfo(b).IsLocked());
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@ -156,6 +156,7 @@ private:
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HostLoc LoadImmediateIntoHostLocReg(IR::Value imm, HostLoc reg);
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void Move(HostLoc to, HostLoc from);
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void CopyToScratch(HostLoc to, HostLoc from);
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void Exchange(HostLoc a, HostLoc b);
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void MoveOutOfTheWay(HostLoc reg);
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