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Don't bother calculating info unless its needed. May reduce number of stack slots created.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7584 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-04 23:42:37 +00:00
parent b8822ad224
commit 27615d7f21
1 changed files with 2 additions and 4 deletions
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6
lib/CodeGen/RegAllocLocal.cpp
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@ -238,10 +238,6 @@ void RA::spillVirtReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
DEBUG(std::cerr << " which corresponds to no vreg, "
<< "must be spurious physreg: ignoring (WARNING)\n");
} else {
// FIXME: move this into the conditional??
const TargetRegisterClass *RC = MF->getSSARegMap()->getRegClass(VirtReg);
int FrameIndex = getStackSpaceFor(VirtReg, RC);
DEBUG(std::cerr << " containing %reg" << VirtReg;
if (!isVirtRegModified(VirtReg))
std::cerr << " which has not been modified, so no store necessary!");
@ -250,6 +246,8 @@ void RA::spillVirtReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
// register. We only need to spill it into its stack slot if it has been
// modified.
if (isVirtRegModified(VirtReg)) {
const TargetRegisterClass *RC = MF->getSSARegMap()->getRegClass(VirtReg);
int FrameIndex = getStackSpaceFor(VirtReg, RC);
DEBUG(std::cerr << " to stack slot #" << FrameIndex);
RegInfo->storeRegToStackSlot(MBB, I, PhysReg, FrameIndex, RC);
++NumSpilled; // Update statistics