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Allow any MachineBasicBlock (not just the entry block) to have live-in physical

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registers. Make sure liveinterval analysis is correctly creating live ranges
for them.

llvm-svn: 34217
This commit is contained in:
Evan Cheng
2007-02-13 01:30:55 +00:00
parent 9056bae3be
commit b612316f20
2 changed files with 41 additions and 47 deletions
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16
llvm/lib/CodeGen/LiveVariables.cpp
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@@ -254,14 +254,6 @@ 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::livein_iterator I = MF.livein_begin(),
E = MF.livein_end(); I != E; ++I) {
assert(MRegisterInfo::isPhysicalRegister(I->first) &&
"Cannot have a live-in virtual register!");
HandlePhysRegDef(I->first, 0);
}
analyzePHINodes(MF);
// Calculate live variable information in depth first order on the CFG of the
@@ -275,6 +267,14 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
E = df_ext_end(Entry, Visited); DFI != E; ++DFI) {
MachineBasicBlock *MBB = *DFI;
// Mark live-in registers as live-in.
for (MachineBasicBlock::livein_iterator II = MBB->livein_begin(),
EE = MBB->livein_end(); II != EE; ++II) {
assert(MRegisterInfo::isPhysicalRegister(*II) &&
"Cannot have a live-in virtual register!");
HandlePhysRegDef(*II, 0);
}
// Loop over all of the instructions, processing them.
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {