Add support for software expansion of 64-bit integer division instructions.

Patch by Dmitri Shtilman!

llvm-svn: 195116

1 files changed, 122 insertions, 0 deletions

diff --git a/llvm/unittests/Transforms/Utils/IntegerDivision.cpp b/llvm/unittests/Transforms/Utils/IntegerDivision.cpp
index 44c2328ee35..f7318a2e789 100644
--- a/llvm/unittests/Transforms/Utils/IntegerDivision.cpp
+++ b/llvm/unittests/Transforms/Utils/IntegerDivision.cpp
@@ -19,6 +19,7 @@ using namespace llvm;
 
 namespace {
 
+
 TEST(IntegerDivision, SDiv) {
   LLVMContext &C(getGlobalContext());
   Module M("test division", C);
@@ -139,4 +140,125 @@ TEST(IntegerDivision, URem) {
   EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
 }
 
+
+TEST(IntegerDivision, SDiv64) {
+  LLVMContext &C(getGlobalContext());
+  Module M("test division", C);
+  IRBuilder<> Builder(C);
+
+  SmallVector<Type*, 2> ArgTys(2, Builder.getInt64Ty());
+  Function *F = Function::Create(FunctionType::get(Builder.getInt64Ty(),
+                                                   ArgTys, false),
+                                 GlobalValue::ExternalLinkage, "F", &M);
+  assert(F->getArgumentList().size() == 2);
+
+  BasicBlock *BB = BasicBlock::Create(C, "", F);
+  Builder.SetInsertPoint(BB);
+
+  Function::arg_iterator AI = F->arg_begin();
+  Value *A = AI++;
+  Value *B = AI++;
+
+  Value *Div = Builder.CreateSDiv(A, B);
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::SDiv);
+
+  Value *Ret = Builder.CreateRet(Div);
+
+  expandDivision(cast<BinaryOperator>(Div));
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
+
+  Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
+  EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::Sub);
+}
+
+TEST(IntegerDivision, UDiv64) {
+  LLVMContext &C(getGlobalContext());
+  Module M("test division", C);
+  IRBuilder<> Builder(C);
+
+  SmallVector<Type*, 2> ArgTys(2, Builder.getInt64Ty());
+  Function *F = Function::Create(FunctionType::get(Builder.getInt64Ty(),
+                                                   ArgTys, false),
+                                 GlobalValue::ExternalLinkage, "F", &M);
+  assert(F->getArgumentList().size() == 2);
+
+  BasicBlock *BB = BasicBlock::Create(C, "", F);
+  Builder.SetInsertPoint(BB);
+
+  Function::arg_iterator AI = F->arg_begin();
+  Value *A = AI++;
+  Value *B = AI++;
+
+  Value *Div = Builder.CreateUDiv(A, B);
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::UDiv);
+
+  Value *Ret = Builder.CreateRet(Div);
+
+  expandDivision(cast<BinaryOperator>(Div));
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
+
+  Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
+  EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::PHI);
+}
+
+TEST(IntegerDivision, SRem64) {
+  LLVMContext &C(getGlobalContext());
+  Module M("test remainder", C);
+  IRBuilder<> Builder(C);
+
+  SmallVector<Type*, 2> ArgTys(2, Builder.getInt64Ty());
+  Function *F = Function::Create(FunctionType::get(Builder.getInt64Ty(),
+                                                   ArgTys, false),
+                                 GlobalValue::ExternalLinkage, "F", &M);
+  assert(F->getArgumentList().size() == 2);
+
+  BasicBlock *BB = BasicBlock::Create(C, "", F);
+  Builder.SetInsertPoint(BB);
+
+  Function::arg_iterator AI = F->arg_begin();
+  Value *A = AI++;
+  Value *B = AI++;
+
+  Value *Rem = Builder.CreateSRem(A, B);
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::SRem);
+
+  Value *Ret = Builder.CreateRet(Rem);
+
+  expandRemainder(cast<BinaryOperator>(Rem));
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
+
+  Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
+  EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
+}
+
+TEST(IntegerDivision, URem64) {
+  LLVMContext &C(getGlobalContext());
+  Module M("test remainder", C);
+  IRBuilder<> Builder(C);
+
+  SmallVector<Type*, 2> ArgTys(2, Builder.getInt64Ty());
+  Function *F = Function::Create(FunctionType::get(Builder.getInt64Ty(),
+                                                   ArgTys, false),
+                                 GlobalValue::ExternalLinkage, "F", &M);
+  assert(F->getArgumentList().size() == 2);
+
+  BasicBlock *BB = BasicBlock::Create(C, "", F);
+  Builder.SetInsertPoint(BB);
+
+  Function::arg_iterator AI = F->arg_begin();
+  Value *A = AI++;
+  Value *B = AI++;
+
+  Value *Rem = Builder.CreateURem(A, B);
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::URem);
+
+  Value *Ret = Builder.CreateRet(Rem);
+
+  expandRemainder(cast<BinaryOperator>(Rem));
+  EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
+
+  Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
+  EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
+}
+
 }