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DAG: Remove redundant handling of reg fixups 

It looks like 9cac4e6d14 accidentally
added a second copy of this from a bad rebase or something. This
second copy was added, and the finalizeLowering call was not deleted
as intended.
This commit is contained in:
Matt Arsenault 2020-07-08 18:19:23 -04:00
parent ac0af12ed2
commit 2ec5fc0c61
1 changed files with 0 additions and 28 deletions
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28
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -661,34 +661,6 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
// Determine if floating point is used for msvc
computeUsesMSVCFloatingPoint(TM.getTargetTriple(), Fn, MF->getMMI());
// Replace forward-declared registers with the registers containing
// the desired value.
for (DenseMap<Register, Register>::iterator
I = FuncInfo->RegFixups.begin(), E = FuncInfo->RegFixups.end();
I != E; ++I) {
Register From = I->first;
Register To = I->second;
// If To is also scheduled to be replaced, find what its ultimate
// replacement is.
while (true) {
DenseMap<Register, Register>::iterator J = FuncInfo->RegFixups.find(To);
if (J == E) break;
To = J->second;
}
// Make sure the new register has a sufficiently constrained register class.
if (Register::isVirtualRegister(From) && Register::isVirtualRegister(To))
MRI.constrainRegClass(To, MRI.getRegClass(From));
// Replace it.
// Replacing one register with another won't touch the kill flags.
// We need to conservatively clear the kill flags as a kill on the old
// register might dominate existing uses of the new register.
if (!MRI.use_empty(To))
MRI.clearKillFlags(From);
MRI.replaceRegWith(From, To);
}
TLI->finalizeLowering(*MF);
// Release function-specific state. SDB and CurDAG are already cleared