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8 changes: 6 additions & 2 deletions llvm/utils/TableGen/CodeGenRegisters.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -2144,7 +2144,7 @@ void CodeGenRegBank::computeRegUnitLaneMasks() {
// Create an initial lane mask for all register units.
const auto &RegUnits = Register.getRegUnits();
CodeGenRegister::RegUnitLaneMaskList RegUnitLaneMasks(
RegUnits.count(), LaneBitmask::getAll());
RegUnits.count(), LaneBitmask::getNone());
// Iterate through SubRegisters.
typedef CodeGenRegister::SubRegMap SubRegMap;
const SubRegMap &SubRegs = Register.getSubRegs();
Expand All @@ -2163,7 +2163,7 @@ void CodeGenRegBank::computeRegUnitLaneMasks() {
unsigned u = 0;
for (unsigned RU : RegUnits) {
if (SUI == RU) {
RegUnitLaneMasks[u] &= LaneMask;
RegUnitLaneMasks[u] |= LaneMask;
assert(!Found);
Found = true;
}
Expand All @@ -2173,6 +2173,10 @@ void CodeGenRegBank::computeRegUnitLaneMasks() {
assert(Found);
}
}
for (auto &Mask : RegUnitLaneMasks) {
if (Mask.none())
Mask = LaneBitmask::getAll();
}
Register.setRegUnitLaneMasks(RegUnitLaneMasks);
}
}
Expand Down