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Fix bug: Jello/2003-08-15-AllocaAssertion.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7916 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-17 18:01:15 +00:00
parent 7dd46b09c0
commit 128c2aa493
1 changed files with 18 additions and 8 deletions
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26
lib/CodeGen/RegAllocLocal.cpp
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@ -143,10 +143,12 @@ namespace {
unsigned VirtReg, unsigned PhysReg);
/// spillPhysReg - This method spills the specified physical register into
/// the virtual register slot associated with it.
/// the virtual register slot associated with it. If OnlyVirtRegs is set to
/// true, then the request is ignored if the physical register does not
/// contain a virtual register.
///
void spillPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
unsigned PhysReg);
unsigned PhysReg, bool OnlyVirtRegs = false);
/// assignVirtToPhysReg - This method updates local state so that we know
/// that PhysReg is the proper container for VirtReg now. The physical
@ -259,20 +261,24 @@ void RA::spillVirtReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
/// spillPhysReg - This method spills the specified physical register into the
/// virtual register slot associated with it.
/// virtual register slot associated with it. If OnlyVirtRegs is set to true,
/// then the request is ignored if the physical register does not contain a
/// virtual register.
///
void RA::spillPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
unsigned PhysReg) {
unsigned PhysReg, bool OnlyVirtRegs) {
std::map<unsigned, unsigned>::iterator PI = PhysRegsUsed.find(PhysReg);
if (PI != PhysRegsUsed.end()) { // Only spill it if it's used!
spillVirtReg(MBB, I, PI->second, PhysReg);
if (PI->second || !OnlyVirtRegs)
spillVirtReg(MBB, I, PI->second, PhysReg);
} else if (const unsigned *AliasSet = RegInfo->getAliasSet(PhysReg)) {
// If the selected register aliases any other registers, we must make
// sure that one of the aliases isn't alive...
for (unsigned i = 0; AliasSet[i]; ++i) {
PI = PhysRegsUsed.find(AliasSet[i]);
if (PI != PhysRegsUsed.end()) // Spill aliased register...
spillVirtReg(MBB, I, PI->second, AliasSet[i]);
if (PI->second || !OnlyVirtRegs)
spillVirtReg(MBB, I, PI->second, AliasSet[i]);
}
}
}
@ -520,7 +526,7 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
MI->getOperand(i).opIsDefAndUse()) &&
MI->getOperand(i).isPhysicalRegister()) {
unsigned Reg = MI->getOperand(i).getAllocatedRegNum();
spillPhysReg(MBB, I, Reg); // Spill any existing value in the reg
spillPhysReg(MBB, I, Reg, true); // Spill any existing value in the reg
PhysRegsUsed[Reg] = 0; // It is free and reserved now
PhysRegsUseOrder.push_back(Reg);
}
@ -618,7 +624,11 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
<< I->second << "\n";
assert(Virt2PhysRegMap.empty() && "Virtual registers still in phys regs?");
assert(PhysRegsUseOrder.empty() && "Physical regs still allocated?");
// Clear any physical register which appear live at the end of the basic
// block, but which do not hold any virtual registers. e.g., the stack
// pointer.
PhysRegsUseOrder.clear();
}