[NFC][SCEV] Refactor getAbsExpr() out of createSCEV()

diff --git a/llvm/include/llvm/Analysis/ScalarEvolution.h b/llvm/include/llvm/Analysis/ScalarEvolution.h
index 34849eb..65d092a 100644 (file)
--- a/llvm/include/llvm/Analysis/ScalarEvolution.h
+++ b/llvm/include/llvm/Analysis/ScalarEvolution.h
@@ -572,6 +572,7 @@ public:
   /// \p IndexExprs The expressions for the indices.
   const SCEV *getGEPExpr(GEPOperator *GEP,
                          const SmallVectorImpl<const SCEV *> &IndexExprs);
+  const SCEV *getAbsExpr(const SCEV *Op, bool IsNSW);
   const SCEV *getMinMaxExpr(unsigned Kind,
                             SmallVectorImpl<const SCEV *> &Operands);
   const SCEV *getSMaxExpr(const SCEV *LHS, const SCEV *RHS);

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 697d254..f3e152b 100644 (file)
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -3334,6 +3334,11 @@ ScalarEvolution::findExistingSCEVInCache(int SCEVType,
       UniqueSCEVs.FindNodeOrInsertPos(ID, IP), std::move(ID), IP);
 }
 
+const SCEV *ScalarEvolution::getAbsExpr(const SCEV *Op, bool IsNSW) {
+  SCEV::NoWrapFlags Flags = IsNSW ? SCEV::FlagNSW : SCEV::FlagAnyWrap;
+  return getSMaxExpr(Op, getNegativeSCEV(Op, Flags));
+}
+
 const SCEV *ScalarEvolution::getMinMaxExpr(unsigned Kind,
                                            SmallVectorImpl<const SCEV *> &Ops) {
   assert(!Ops.empty() && "Cannot get empty (u|s)(min|max)!");
@@ -6340,14 +6345,10 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
 
     if (auto *II = dyn_cast<IntrinsicInst>(U)) {
       switch (II->getIntrinsicID()) {
-      case Intrinsic::abs: {
-        const SCEV *Op = getSCEV(II->getArgOperand(0));
-        SCEV::NoWrapFlags Flags =
-            cast<ConstantInt>(II->getArgOperand(1))->isOne()
-                ? SCEV::FlagNSW
-                : SCEV::FlagAnyWrap;
-        return getSMaxExpr(Op, getNegativeSCEV(Op, Flags));
-      }
+      case Intrinsic::abs:
+        return getAbsExpr(
+            getSCEV(II->getArgOperand(0)),
+            /*IsNSW=*/cast<ConstantInt>(II->getArgOperand(1))->isOne());
       case Intrinsic::umax:
         return getUMaxExpr(getSCEV(II->getArgOperand(0)),
                            getSCEV(II->getArgOperand(1)));