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Revert the optimization in r122596. It is correct for all current targets, but 

it relies on assumptions that may not be true in the future.

llvm-svn: 122608
This commit is contained in:
Cameron Zwarich 2010-12-28 23:02:56 +00:00
parent 2f15503d5a
commit 146666eabb
1 changed files with 8 additions and 1 deletions
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9
llvm/lib/CodeGen/StrongPHIElimination.cpp
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@ -472,9 +472,16 @@ StrongPHIElimination::SplitInterferencesForBasicBlock(
for (MachineBasicBlock::iterator BBI = MBB.begin(), BBE = MBB.end();
BBI != BBE; ++BBI) {
for (MachineInstr::const_mop_iterator I = BBI->operands_begin(),
E = BBI->operands_end(); I != E && I->isReg() && I->isDef(); ++I) {
E = BBI->operands_end(); I != E; ++I) {
const MachineOperand& MO = *I;
// FIXME: This would be faster if it were possible to bail out of checking
// an instruction's operands after the explicit defs, but this is incorrect
// for variadic instructions, which may appear before register allocation
// in the future.
if (!MO.isReg() || !MO.isDef())
continue;
unsigned DestReg = MO.getReg();
if (!DestReg || !TargetRegisterInfo::isVirtualRegister(DestReg))
continue;