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Add a m_SignBit pattern for convenience.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124656 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -116,6 +116,21 @@ struct all_ones_ty {
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/// m_AllOnes() - Match an integer or vector with all bits set to true.
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inline all_ones_ty m_AllOnes() { return all_ones_ty(); }
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struct signbit_ty {
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
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return CI->getValue().isSignBit();
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI = cast_or_null<ConstantInt>(CV->getSplatValue()))
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return CI->getValue().isSignBit();
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return false;
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}
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};
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/// m_SignBit() - Match an integer or vector with only the sign bit(s) set.
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inline signbit_ty m_SignBit() { return signbit_ty(); }
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template<typename Class>
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struct bind_ty {
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@ -666,9 +666,7 @@ bool llvm::isPowerOfTwo(Value *V, const TargetData *TD, unsigned Depth) {
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// (signbit) >>l X is clearly a power of two if the one is not shifted off the
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// bottom. If it is shifted off the bottom then the result is undefined.
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ConstantInt *CI;
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if (match(V, m_LShr(m_ConstantInt(CI), m_Value())) &&
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CI->getValue().isSignBit())
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if (match(V, m_LShr(m_SignBit(), m_Value())))
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return true;
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// The remaining tests are all recursive, so bail out if we hit the limit.
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