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Once we have a way to fold spill code reloads into instructions, we have a way to use it. :)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11517 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-17 04:08:37 +00:00
parent 355a724bd8
commit 1e3812c1c5
1 changed files with 17 additions and 2 deletions
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19
lib/CodeGen/RegAllocLocal.cpp
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@ -487,9 +487,24 @@ MachineInstr *RA::reloadVirtReg(MachineBasicBlock &MBB, MachineInstr *MI,
return MI;
}
unsigned PhysReg = getReg(MBB, MI, VirtReg);
// Otherwise, we need to fold it into the current instruction, or reload it.
// If we have registers available to hold the value, use them.
const TargetRegisterClass *RC = MF->getSSARegMap()->getRegClass(VirtReg);
unsigned PhysReg = getFreeReg(RC);
if (PhysReg == 0) { // No registers available...
/// If we can fold this spill into this instruction, do so now.
if (0) {
// TODO
return MI;
}
// It looks like we can't fold this virtual register load into this
// instruction. Force some poor hapless value out of the register file to
// make room for the new register, and reload it.
PhysReg = getReg(MBB, MI, VirtReg);
}
int FrameIndex = getStackSpaceFor(VirtReg, RC);
markVirtRegModified(VirtReg, false); // Note that this reg was just reloaded