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Fix bug: Jello/2003-08-23-RegisterAllocatePhysReg.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8095 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-08-23 23:49:42 +00:00
parent ae1c1ffacd
commit 41822c790f
1 changed files with 21 additions and 13 deletions
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8
lib/CodeGen/RegAllocLocal.cpp
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@ -400,6 +400,13 @@ unsigned RA::getReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
"Couldn't find a register of the appropriate class!");
unsigned R = PhysRegsUseOrder[i];
// We can only use this register if it holds a virtual register (ie, it
// can be spilled). Do not use it if it is an explicitly allocated
// physical register!
assert(PhysRegsUsed.count(R) &&
"PhysReg in PhysRegsUseOrder, but is not allocated?");
if (PhysRegsUsed[R]) {
// If the current register is compatible, use it.
if (RegInfo->getRegClass(R) == RC) {
PhysReg = R;
@ -415,6 +422,7 @@ unsigned RA::getReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
}
}
}
}
assert(PhysReg && "Physical register not assigned!?!?");