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Don't bother spilling before a return

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llvm-svn: 103831
This commit is contained in:
Jakob Stoklund Olesen 2010-05-14 22:40:43 +00:00
parent ed0d357e27
commit 7a16481068
1 changed files with 13 additions and 4 deletions
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17
lib/CodeGen/RegAllocFast.cpp
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@ -768,11 +768,20 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) {
// Spill all physical registers holding virtual registers now.
atEndOfBlock = true;
DEBUG(dbgs() << "Killing live registers at end of block.\n");
MachineBasicBlock::iterator MI = MBB.getFirstTerminator();
for (LiveRegMap::iterator i = LiveVirtRegs.begin(), e = LiveVirtRegs.end();
i != e; ++i)
spillVirtReg(MBB, MI, i, true);
if (MI != MBB.end() && MI->getDesc().isReturn()) {
// This is a return block, kill all virtual registers.
DEBUG(dbgs() << "Killing live registers at end of return block.\n");
for (LiveRegMap::iterator i = LiveVirtRegs.begin(), e = LiveVirtRegs.end();
i != e; ++i)
killVirtReg(i);
} else {
// This is a normal block, spill any dirty virtregs.
DEBUG(dbgs() << "Spilling live registers at end of block.\n");
for (LiveRegMap::iterator i = LiveVirtRegs.begin(), e = LiveVirtRegs.end();
i != e; ++i)
spillVirtReg(MBB, MI, i, true);
}
LiveVirtRegs.clear();
// Erase all the coalesced copies. We are delaying it until now because