use 'match' to simplify some code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92400 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index c6a8df4..ee0b937 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -2949,12 +2949,11 @@
// Optimize pointer differences into the same array into a size. Consider:
// &A[10] - &A[0]: we should compile this to "10".
if (TD) {
- if (PtrToIntInst *LHS = dyn_cast<PtrToIntInst>(Op0))
- if (PtrToIntInst *RHS = dyn_cast<PtrToIntInst>(Op1))
- if (Value *Res = OptimizePointerDifference(LHS->getOperand(0),
- RHS->getOperand(0),
- I.getType()))
- return ReplaceInstUsesWith(I, Res);
+ Value *LHSOp, *RHSOp;
+ if (match(Op0, m_Cast<PtrToIntInst>(m_Value(LHSOp))) &&
+ match(Op1, m_Cast<PtrToIntInst>(m_Value(RHSOp))))
+ if (Value *Res = OptimizePointerDifference(LHSOp, RHSOp, I.getType()))
+ return ReplaceInstUsesWith(I, Res);
// trunc(p)-trunc(q) -> trunc(p-q)
if (TruncInst *LHST = dyn_cast<TruncInst>(Op0))