[InstCombine] use m_APInt; NFCI

llvm-svn: 273715

1 files changed, 8 insertions, 18 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index e23b70a..a02d8ea 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -126,33 +126,23 @@ bool InstCombiner::ShouldChangeType(Type *From, Type *To) const {
 // all other opcodes, the function conservatively returns false.
 static bool MaintainNoSignedWrap(BinaryOperator &I, Value *B, Value *C) {
   OverflowingBinaryOperator *OBO = dyn_cast<OverflowingBinaryOperator>(&I);
-  if (!OBO || !OBO->hasNoSignedWrap()) {
+  if (!OBO || !OBO->hasNoSignedWrap())
     return false;
-  }
 
   // We reason about Add and Sub Only.
   Instruction::BinaryOps Opcode = I.getOpcode();
-  if (Opcode != Instruction::Add &&
-      Opcode != Instruction::Sub) {
+  if (Opcode != Instruction::Add && Opcode != Instruction::Sub)
     return false;
-  }
 
-  ConstantInt *CB = dyn_cast<ConstantInt>(B);
-  ConstantInt *CC = dyn_cast<ConstantInt>(C);
-
-  if (!CB || !CC) {
+  const APInt *BVal, *CVal;
+  if (!match(B, m_APInt(BVal)) || !match(C, m_APInt(CVal)))
     return false;
-  }
 
-  const APInt &BVal = CB->getValue();
-  const APInt &CVal = CC->getValue();
   bool Overflow = false;
-
-  if (Opcode == Instruction::Add) {
-    BVal.sadd_ov(CVal, Overflow);
-  } else {
-    BVal.ssub_ov(CVal, Overflow);
-  }
+  if (Opcode == Instruction::Add)
+    BVal->sadd_ov(*CVal, Overflow);
+  else
+    BVal->ssub_ov(*CVal, Overflow);
 
   return !Overflow;
 }