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Constrain register classes instead of emitting copies.
[oota-llvm.git]
/
lib
/
CodeGen
/
RegisterClassInfo.cpp
diff --git
a/lib/CodeGen/RegisterClassInfo.cpp
b/lib/CodeGen/RegisterClassInfo.cpp
index 5a77e47bc5919bf8b7d542c8530ce70b26fd8c33..786d279c2b8c29e0a09a011d49b72fe7fa74a783 100644
(file)
--- a/
lib/CodeGen/RegisterClassInfo.cpp
+++ b/
lib/CodeGen/RegisterClassInfo.cpp
@@
-99,11
+99,16
@@
void RegisterClassInfo::compute(const TargetRegisterClass *RC) const {
// CSR aliases go after the volatile registers, preserve the target's order.
std::copy(CSRAlias.begin(), CSRAlias.end(), &RCI.Order[N]);
// CSR aliases go after the volatile registers, preserve the target's order.
std::copy(CSRAlias.begin(), CSRAlias.end(), &RCI.Order[N]);
+ // Check if RC is a proper sub-class.
+ if (const TargetRegisterClass *Super = TRI->getLargestLegalSuperClass(RC))
+ if (Super != RC && getNumAllocatableRegs(Super) > RCI.NumRegs)
+ RCI.ProperSubClass = true;
+
DEBUG({
dbgs() << "AllocationOrder(" << RC->getName() << ") = [";
for (unsigned I = 0; I != RCI.NumRegs; ++I)
dbgs() << ' ' << PrintReg(RCI.Order[I], TRI);
DEBUG({
dbgs() << "AllocationOrder(" << RC->getName() << ") = [";
for (unsigned I = 0; I != RCI.NumRegs; ++I)
dbgs() << ' ' << PrintReg(RCI.Order[I], TRI);
- dbgs() <<
" ]\n"
;
+ dbgs() <<
(RCI.ProperSubClass ? " ] (sub-class)\n" : " ]\n")
;
});
// RCI is now up-to-date.
});
// RCI is now up-to-date.