Don't store COPY pointers in VNInfo.
If a value is defined by a COPY, that instuction can easily and cheaply
be found by getInstructionFromIndex(VNI->def).
This reduces the size of VNInfo from 24 to 16 bytes, and improves
llc compile time by 3%.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149763 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index 66c8e84..ab9b524 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -374,7 +374,7 @@
LiveInterval *LI = Edit->get(RegIdx);
// Create a new value.
- VNInfo *VNI = LI->getNextValue(Idx, 0, LIS.getVNInfoAllocator());
+ VNInfo *VNI = LI->getNextValue(Idx, LIS.getVNInfoAllocator());
// Use insert for lookup, so we can add missing values with a second lookup.
std::pair<ValueMap::iterator, bool> InsP =
@@ -449,9 +449,7 @@
}
// Define the value in Reg.
- VNInfo *VNI = defValue(RegIdx, ParentVNI, Def);
- VNI->setCopy(CopyMI);
- return VNI;
+ return defValue(RegIdx, ParentVNI, Def);
}
/// Create a new virtual register and live interval.
@@ -1053,7 +1051,6 @@
unsigned RegIdx = RegAssign.lookup(ParentVNI->def);
VNInfo *VNI = defValue(RegIdx, ParentVNI, ParentVNI->def);
VNI->setIsPHIDef(ParentVNI->isPHIDef());
- VNI->setCopy(ParentVNI->getCopy());
// Force rematted values to be recomputed everywhere.
// The new live ranges may be truncated.