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Add unit tests for getUnderlyingObject #89120

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Add unit tests for getUnderlyingObject #89120

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72 changes: 72 additions & 0 deletions llvm/unittests/Analysis/ValueTrackingTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1247,6 +1247,78 @@ TEST_F(ValueTrackingTest, computePtrAlignment) {
EXPECT_EQ(getKnownAlignment(A, DL, CxtI3, &AC, &DT), Align(16));
}

TEST_F(ValueTrackingTest, getUnderlyingObjectCastsAliases) {
parseAssembly(R"IR(
@gvar = global i32 0
@alias = alias i32, i32* @gvar
@alias_interposable = weak alias i32, i32* @gvar
define void @test() {
%A = call ptr @llvm.ssa.copy.p0(ptr @gvar)
%A2 = call ptr @llvm.ssa.copy.p0(ptr bitcast(ptr @gvar to ptr))
%A3 = call ptr addrspace(42) @llvm.ssa.copy.p42(ptr addrspace(42) addrspacecast(ptr @gvar to ptr addrspace(42)))
%A4 = call ptr @llvm.ssa.copy.p0(ptr @alias)
%A5 = call ptr @llvm.ssa.copy.p0(ptr @alias_interposable)
ret void
}
)IR");
Value *gvar = A->getOperand(0);
EXPECT_EQ(getUnderlyingObject(A->getOperand(0)), gvar);
EXPECT_EQ(getUnderlyingObject(A2->getOperand(0)), gvar);
EXPECT_EQ(getUnderlyingObject(A3->getOperand(0)), gvar);
EXPECT_EQ(getUnderlyingObject(A4->getOperand(0)), gvar);
EXPECT_EQ(getUnderlyingObject(A4->getOperand(0)), gvar);
// should not skip interposable alias
EXPECT_EQ(getUnderlyingObject(A5->getOperand(0)), A5->getOperand(0));
}

TEST_F(ValueTrackingTest, getUnderlyingObjectIntrinsics) {
parseAssembly(R"IR(
define void @test(ptr %arg) {
; intrinsic with Return<> arg attribute
%A = call ptr @llvm.objc.retain(ptr %arg)
%A2 = call ptr @llvm.ssa.copy(ptr %arg)
; special cased intrinsics
%A3 = call ptr @llvm.launder.invariant.group(ptr %arg)
ret void
}
)IR");
Value *arg = F->getArg(0);
EXPECT_EQ(getUnderlyingObject(A), arg);
EXPECT_EQ(getUnderlyingObject(A2), arg);
EXPECT_EQ(getUnderlyingObject(A3), arg);
}

TEST_F(ValueTrackingTest, getUnderlyingObjectPtrInt) {
parseAssembly(R"IR(
define void @test(i64 %arg, ptr %arg1) {
%A = inttoptr i64 %arg to ptr
%t0 = ptrtoint ptr %arg1 to i64
%A2 = inttoptr i64 %t0 to ptr
ret void
}
)IR");
// Should not skip anything here
EXPECT_EQ(getUnderlyingObject(A->getOperand(0)), A->getOperand(0));
EXPECT_EQ(getUnderlyingObject(A2->getOperand(0)), A2->getOperand(0));
}

TEST_F(ValueTrackingTest, getUnderlyingObjectPhi) {
parseAssembly(R"IR(
@gvar = global i32 0
define void @test() {
entry:
%A = call ptr @llvm.ssa.copy.p0(ptr @gvar)
br label %block2

block2:
%A2 = phi ptr [ @gvar, %entry ]
ret void
}
)IR");
Value *gvar = A->getOperand(0);
EXPECT_EQ(getUnderlyingObject(A2->getOperand(0)), gvar);
}

TEST_F(ComputeKnownBitsTest, ComputeKnownBits) {
parseAssembly(
"define i32 @test(i32 %a, i32 %b) {\n"
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