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Move IsSameValue from clang's ASTImporter to be methods on the

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APInt/APSInt classes.

Part of rdar://11875995

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2012-07-15 00:23:36 +00:00
parent 65f489fd7d
commit 5449a1db40
2 changed files with 39 additions and 0 deletions
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12
include/llvm/ADT/APInt.h
View File

@ -511,6 +511,18 @@ public:
return getAllOnesValue(numBits).lshr(numBits - loBitsSet);
}
/// \brief Determine if two APInts have the same value, after zero-extending
/// one of them (if needed!) to ensure that the bit-widths match.
static bool isSameValue(const APInt &I1, const APInt &I2) {
if (I1.getBitWidth() == I2.getBitWidth())
return I1 == I2;
if (I1.getBitWidth() > I2.getBitWidth())
return I1 == I2.zext(I1.getBitWidth());
return I1.zext(I2.getBitWidth()) == I2;
}
/// \brief Overload to compute a hash_code for an APInt value.
friend hash_code hash_value(const APInt &Arg);

27
include/llvm/ADT/APSInt.h
View File

@ -250,6 +250,33 @@ public:
: APInt::getSignedMinValue(numBits), Unsigned);
}
/// \brief Determine if two APSInts have the same value, zero- or
/// sign-extending as needed.
static bool isSameValue(const APSInt &I1, const APSInt &I2) {
if (I1.getBitWidth() == I2.getBitWidth() && I1.isSigned() == I2.isSigned())
return I1 == I2;
// Check for a bit-width mismatch.
if (I1.getBitWidth() > I2.getBitWidth())
return isSameValue(I1, I2.extend(I1.getBitWidth()));
else if (I2.getBitWidth() > I1.getBitWidth())
return isSameValue(I1.extend(I2.getBitWidth()), I2);
// We have a signedness mismatch. Turn the signed value into an unsigned
// value.
if (I1.isSigned()) {
if (I1.isNegative())
return false;
return APSInt(I1, true) == I2;
}
if (I2.isNegative())
return false;
return I1 == APSInt(I2, true);
}
/// Profile - Used to insert APSInt objects, or objects that contain APSInt
/// objects, into FoldingSets.
void Profile(FoldingSetNodeID& ID) const;