using namespace llvm;
+APSInt::APSInt(StringRef Str) {
+ assert(!Str.empty() && "Invalid string length");
+
+ // (Over-)estimate the required number of bits.
+ unsigned NumBits = ((Str.size() * 64) / 19) + 2;
+ APInt Tmp(NumBits, Str, /*Radix=*/10);
+ if (Str[0] == '-') {
+ unsigned MinBits = Tmp.getMinSignedBits();
+ if (MinBits > 0 && MinBits < NumBits)
+ Tmp = Tmp.trunc(MinBits);
+ *this = APSInt(Tmp, /*IsUnsigned=*/false);
+ return;
+ }
+ unsigned ActiveBits = Tmp.getActiveBits();
+ if (ActiveBits > 0 && ActiveBits < NumBits)
+ Tmp = Tmp.trunc(ActiveBits);
+ *this = APSInt(Tmp, /*IsUnsigned=*/true);
+}
+
void APSInt::Profile(FoldingSetNodeID& ID) const {
ID.AddInteger((unsigned) (IsUnsigned ? 1 : 0));
APInt::Profile(ID);