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Consider the livein/out set for a function, allowing targets to not have to

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use ugly imp_def/imp_uses for arguments and return values.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-09 15:23:25 +00:00
parent dde3a9abc3
commit d493b34d31
1 changed files with 20 additions and 0 deletions
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20
lib/CodeGen/LiveVariables.cpp
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@ -163,6 +163,14 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
/// Get some space for a respectable number of registers...
VirtRegInfo.resize(64);
// Mark live-in registers as live-in.
for (MachineFunction::liveinout_iterator I = MF.livein_begin(),
E = MF.livein_end(); I != E; ++I) {
assert(MRegisterInfo::isPhysicalRegister(*I) &&
"Cannot have a live-in virtual register!");
HandlePhysRegDef(*I, 0);
}
// Calculate live variable information in depth first order on the CFG of the
// function. This guarantees that we will see the definition of a virtual
@ -260,6 +268,18 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
}
}
// Finally, if the last block in the function is a return, make sure to mark
// it as using all of the live-out values in the function.
if (!MBB->empty() && TII.isReturn(MBB->back().getOpcode())) {
MachineInstr *Ret = &MBB->back();
for (MachineFunction::liveinout_iterator I = MF.liveout_begin(),
E = MF.liveout_end(); I != E; ++I) {
assert(MRegisterInfo::isPhysicalRegister(*I) &&
"Cannot have a live-in virtual register!");
HandlePhysRegUse(*I, Ret);
}
}
// Loop over PhysRegInfo, killing any registers that are available at the
// end of the basic block. This also resets the PhysRegInfo map.
for (unsigned i = 0, e = RegInfo->getNumRegs(); i != e; ++i)