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Non-allocatable physregs can be killed and dead, but don't treat them as

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safe for later allocation.  This fixes McCat/18-imp with llc-beta.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30204 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-08 20:21:31 +00:00
parent cc406328bf
commit 0c5b8dac79
1 changed files with 6 additions and 0 deletions
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6
lib/CodeGen/RegAllocLocal.cpp
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@ -580,6 +580,9 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
unsigned &PhysRegSlot = getVirt2PhysRegMapSlot(VirtReg);
PhysReg = PhysRegSlot;
PhysRegSlot = 0;
} else if (PhysRegsUsed[PhysReg] == -2) {
// Unallocatable register dead, ignore.
continue;
}
if (PhysReg) {
@ -669,6 +672,9 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
PhysReg = PhysRegSlot;
assert(PhysReg != 0);
PhysRegSlot = 0;
} else if (PhysRegsUsed[PhysReg] == -2) {
// Unallocatable register dead, ignore.
continue;
}
if (PhysReg) {