forked from OSchip/llvm-project
Move IsSameValue from clang's ASTImporter to be methods on the
APInt/APSInt classes. Part of rdar://11875995 llvm-svn: 160223
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@ -511,6 +511,18 @@ public:
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return getAllOnesValue(numBits).lshr(numBits - loBitsSet);
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}
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/// \brief Determine if two APInts have the same value, after zero-extending
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/// one of them (if needed!) to ensure that the bit-widths match.
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static bool isSameValue(const APInt &I1, const APInt &I2) {
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if (I1.getBitWidth() == I2.getBitWidth())
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return I1 == I2;
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if (I1.getBitWidth() > I2.getBitWidth())
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return I1 == I2.zext(I1.getBitWidth());
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return I1.zext(I2.getBitWidth()) == I2;
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}
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/// \brief Overload to compute a hash_code for an APInt value.
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friend hash_code hash_value(const APInt &Arg);
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@ -250,6 +250,33 @@ public:
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: APInt::getSignedMinValue(numBits), Unsigned);
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}
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/// \brief Determine if two APSInts have the same value, zero- or
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/// sign-extending as needed.
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static bool isSameValue(const APSInt &I1, const APSInt &I2) {
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if (I1.getBitWidth() == I2.getBitWidth() && I1.isSigned() == I2.isSigned())
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return I1 == I2;
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// Check for a bit-width mismatch.
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if (I1.getBitWidth() > I2.getBitWidth())
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return isSameValue(I1, I2.extend(I1.getBitWidth()));
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else if (I2.getBitWidth() > I1.getBitWidth())
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return isSameValue(I1.extend(I2.getBitWidth()), I2);
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// We have a signedness mismatch. Turn the signed value into an unsigned
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// value.
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if (I1.isSigned()) {
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if (I1.isNegative())
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return false;
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return APSInt(I1, true) == I2;
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}
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if (I2.isNegative())
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return false;
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return I1 == APSInt(I2, true);
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}
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/// Profile - Used to insert APSInt objects, or objects that contain APSInt
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/// objects, into FoldingSets.
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void Profile(FoldingSetNodeID& ID) const;
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