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Handle register mask operands in setPhysRegsDeadExcept().

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Calls that use register mask operands don't have implicit defs for
returned values.  The register mask operand handles the call clobber,
but it always behaves like a set of dead defs.

Add live implicit defs for any implicitly defined physregs that are
actually used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149715 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-02-03 21:23:14 +00:00
parent ae46a3362d
commit 77180e0b40
2 changed files with 15 additions and 0 deletions
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3
include/llvm/CodeGen/MachineInstr.h
View File

@ -792,6 +792,9 @@ public:
/// setPhysRegsDeadExcept - Mark every physreg used by this instruction as
/// dead except those in the UsedRegs list.
///
/// On instructions with register mask operands, also add implicit-def
/// operands for all registers in UsedRegs.
void setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
const TargetRegisterInfo &TRI);

12
lib/CodeGen/MachineInstr.cpp
View File

@ -1795,8 +1795,13 @@ void MachineInstr::addRegisterDefined(unsigned IncomingReg,
void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
const TargetRegisterInfo &TRI) {
bool HasRegMask = false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isRegMask()) {
HasRegMask = true;
continue;
}
if (!MO.isReg() || !MO.isDef()) continue;
unsigned Reg = MO.getReg();
if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
@ -1810,6 +1815,13 @@ void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
// If there are no uses, including partial uses, the def is dead.
if (Dead) MO.setIsDead();
}
// This is a call with a register mask operand.
// Mask clobbers are always dead, so add defs for the non-dead defines.
if (HasRegMask)
for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
I != E; ++I)
addRegisterDefined(*I, &TRI);
}
unsigned