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Rework the logic to not rely on undefined behaviour (1LL << 64). Also simplify.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132537 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -68,14 +68,9 @@ Init *BitsRecTy::convertValue(BitInit *UI) {
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/// canFitInBitfield - Return true if the number of bits is large enough to hold
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/// the integer value.
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static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
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if (Value >= 0) {
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if (Value & ~((1LL << NumBits) - 1))
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return false;
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} else if ((Value >> NumBits) != -1 || (Value & (1LL << (NumBits-1))) == 0) {
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return false;
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}
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return true;
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// For example, with NumBits == 4, we permit Values from [-7 .. 15].
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return (NumBits >= sizeof(Value) * 8) ||
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(Value >> NumBits == 0) || (Value >> (NumBits-1) == -1);
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}
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/// convertValue from Int initializer to bits type: Split the integer up into the
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