[PATCH] D144381: [SCEV] Added a utility method that raising the number 2 to the desired power to SCEV

[Dmitry Bakunevich via Phabricator via llvm-commits]

dbakunevich updated this revision to Diff 500739.
dbakunevich marked 4 inline comments as done.

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144381/new/

https://reviews.llvm.org/D144381

Files:
  llvm/include/llvm/Analysis/ScalarEvolution.h
  llvm/unittests/Analysis/ScalarEvolutionTest.cpp


Index: llvm/unittests/Analysis/ScalarEvolutionTest.cpp
===================================================================
--- llvm/unittests/Analysis/ScalarEvolutionTest.cpp
+++ llvm/unittests/Analysis/ScalarEvolutionTest.cpp
@@ -1744,4 +1744,20 @@
   });
 }
 
+TEST_F(ScalarEvolutionsTest, CheckGetPowerOfTwo) {
+  Module M("CheckGetPowerOfTwo", Context);
+  FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context), {}, false);
+  Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", M);
+  BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
+  IRBuilder<> Builder(Entry);
+  Builder.CreateRetVoid();
+  ScalarEvolution SE = buildSE(*F);
+  
+  Type *T_int64 = Type::getInt64Ty(Context);
+  for (unsigned short i = 0; i < 64; ++i)
+    EXPECT_TRUE(dyn_cast<SCEVConstant>(SE.getPowerOfTwo(T_int64, i))
+                    ->getValue()
+                    ->equalsInt(1ULL << i));
+}
+
 }  // end namespace llvm
Index: llvm/include/llvm/Analysis/ScalarEvolution.h
===================================================================
--- llvm/include/llvm/Analysis/ScalarEvolution.h
+++ llvm/include/llvm/Analysis/ScalarEvolution.h
@@ -655,6 +655,14 @@
   /// Return a SCEV for the constant 1 of a specific type.
   const SCEV *getOne(Type *Ty) { return getConstant(Ty, 1); }
 
+  /// Return a SCEV for the constant \p Power of two.
+  const SCEV *getPowerOfTwo(Type *Ty, unsigned Power) {
+    assert(Power < getTypeSizeInBits(Ty) && "Power out of range");
+    auto Val = APInt::getZero(getTypeSizeInBits(Ty));
+    Val.setBit(Power);
+    return getConstant(Val);
+  }
+
   /// Return a SCEV for the constant -1 of a specific type.
   const SCEV *getMinusOne(Type *Ty) {
     return getConstant(Ty, -1, /*isSigned=*/true);


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