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InstSimplify: Optimize away pointless comparisons

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(X & INT_MIN) ? X & INT_MAX : X  into  X & INT_MAX
(X & INT_MIN) ? X : X & INT_MAX  into  X
(X & INT_MIN) ? X | INT_MIN : X  into  X
(X & INT_MIN) ? X : X | INT_MIN  into  X | INT_MIN

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224669 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-12-20 03:04:38 +00:00
parent 93e03df3cf
commit 9cd99a0724
3 changed files with 121 additions and 2 deletions
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7
include/llvm/IR/PatternMatch.h
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@@ -272,6 +272,13 @@ struct is_power2 {
inline cst_pred_ty<is_power2> m_Power2() { return cst_pred_ty<is_power2>(); }
inline api_pred_ty<is_power2> m_Power2(const APInt *&V) { return V; }
struct is_maxsignedvalue {
bool isValue(const APInt &C) { return C.isMaxSignedValue(); }
};
inline cst_pred_ty<is_maxsignedvalue> m_MaxSignedValue() { return cst_pred_ty<is_maxsignedvalue>(); }
inline api_pred_ty<is_maxsignedvalue> m_MaxSignedValue(const APInt *&V) { return V; }
template <typename Class> struct bind_ty {
Class *&VR;
bind_ty(Class *&V) : VR(V) {}