Encode small integers more densely in foldingset, avoiding overflowing the SmallVector as often.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33864 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/FoldingSet.cpp b/lib/Support/FoldingSet.cpp
index 1b0e81e..ecb700d 100644
--- a/lib/Support/FoldingSet.cpp
+++ b/lib/Support/FoldingSet.cpp
@@ -44,7 +44,10 @@
}
void FoldingSetImpl::NodeID::AddInteger(uint64_t I) {
Bits.push_back(unsigned(I));
- Bits.push_back(unsigned(I >> 32));
+
+ // If the integer is small, encode it just as 32-bits.
+ if ((uint64_t)(int)I != I)
+ Bits.push_back(unsigned(I >> 32));
}
void FoldingSetImpl::NodeID::AddFloat(float F) {
Bits.push_back(FloatToBits(F));