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Also add <imp-def> operands for defined and dead super-registers when rewriting.

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We cannot rely on the <imp-def> operands added by LiveIntervals in all cases as
demonstrated by the test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130313 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-04-27 17:42:31 +00:00
parent ed708f9c1f
commit 93e110ba34
2 changed files with 39 additions and 7 deletions
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21
lib/CodeGen/VirtRegMap.cpp
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@@ -260,6 +260,8 @@ void VirtRegMap::rewrite(SlotIndexes *Indexes) {
<< "********** Function: "
<< MF->getFunction()->getName() << '\n');
DEBUG(dump());
SmallVector<unsigned, 8> SuperDeads;
SmallVector<unsigned, 8> SuperDefs;
SmallVector<unsigned, 8> SuperKills;
for (MachineFunction::iterator MBBI = MF->begin(), MBBE = MF->end();
@@ -283,12 +285,13 @@ void VirtRegMap::rewrite(SlotIndexes *Indexes) {
if (MO.getSubReg()) {
// A virtual register kill refers to the whole register, so we may
// have to add <imp-use,kill> operands for the super-register.
if (MO.isUse() && MO.isKill() && !MO.isUndef())
SuperKills.push_back(PhysReg);
// We don't have to deal with sub-register defs because
// LiveIntervalAnalysis already added the necessary <imp-def>
// operands.
if (MO.isUse()) {
if (MO.isKill() && !MO.isUndef())
SuperKills.push_back(PhysReg);
} else if (MO.isDead())
SuperDeads.push_back(PhysReg);
else
SuperDefs.push_back(PhysReg);
// PhysReg operands cannot have subregister indexes.
PhysReg = TRI->getSubReg(PhysReg, MO.getSubReg());
@@ -305,6 +308,12 @@ void VirtRegMap::rewrite(SlotIndexes *Indexes) {
while (!SuperKills.empty())
MI->addRegisterKilled(SuperKills.pop_back_val(), TRI, true);
while (!SuperDeads.empty())
MI->addRegisterDead(SuperDeads.pop_back_val(), TRI, true);
while (!SuperDefs.empty())
MI->addRegisterDefined(SuperDefs.pop_back_val(), TRI);
DEBUG(dbgs() << "> " << *MI);
// Finally, remove any identity copies.