1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4; Check that assume is propagated backwards through all
5; operations that are `isGuaranteedToTransferExecutionToSuccessor`
6; (it should reach the load and mark it as `align 32`).
7define i32 @assume_inevitable(i32* %a, i32* %b, i8* %c) {
8; CHECK-LABEL: @assume_inevitable(
9; CHECK-NEXT:  entry:
10; CHECK-NEXT:    [[M:%.*]] = alloca i64, align 8
11; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[A:%.*]], align 32
12; CHECK-NEXT:    [[LOADRES:%.*]] = load i32, i32* [[B:%.*]], align 4
13; CHECK-NEXT:    [[LOADRES2:%.*]] = call i32 @llvm.annotation.i32(i32 [[LOADRES]], i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0), i32 2)
14; CHECK-NEXT:    store i32 [[LOADRES2]], i32* [[A]], align 32
15; CHECK-NEXT:    [[DUMMY_EQ:%.*]] = icmp ugt i32 [[LOADRES]], 42
16; CHECK-NEXT:    tail call void @llvm.assume(i1 [[DUMMY_EQ]])
17; CHECK-NEXT:    [[M_I8:%.*]] = bitcast i64* [[M]] to i8*
18; CHECK-NEXT:    [[M_A:%.*]] = call i8* @llvm.ptr.annotation.p0i8(i8* nonnull [[M_I8]], i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0), i32 2, i8* null)
19; CHECK-NEXT:    [[M_X:%.*]] = bitcast i8* [[M_A]] to i64*
20; CHECK-NEXT:    [[OBJSZ:%.*]] = call i64 @llvm.objectsize.i64.p0i8(i8* [[C:%.*]], i1 false, i1 false, i1 false)
21; CHECK-NEXT:    store i64 [[OBJSZ]], i64* [[M_X]], align 4
22; CHECK-NEXT:    [[PTRINT:%.*]] = ptrtoint i32* [[A]] to i64
23; CHECK-NEXT:    [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 31
24; CHECK-NEXT:    [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
25; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND]])
26; CHECK-NEXT:    ret i32 [[TMP0]]
27;
28entry:
29  %dummy = alloca i8, align 4
30  %m = alloca i64
31  %0 = load i32, i32* %a, align 4
32
33  ; START perform a bunch of inevitable operations
34  %loadres = load i32, i32* %b
35  %loadres2 = call i32 @llvm.annotation.i32(i32 %loadres, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i32 0, i32 0), i32 2)
36  store i32 %loadres2, i32* %a
37
38  %dummy_eq = icmp ugt i32 %loadres, 42
39  tail call void @llvm.assume(i1 %dummy_eq)
40
41  call void @llvm.lifetime.start.p0i8(i64 1, i8* %dummy)
42  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %dummy)
43  call void @llvm.invariant.end.p0i8({}* %i, i64 1, i8* %dummy)
44  call void @llvm.lifetime.end.p0i8(i64 1, i8* %dummy)
45
46  %m_i8 = bitcast i64* %m to i8*
47  %m_a = call i8* @llvm.ptr.annotation.p0i8(i8* %m_i8, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i32 0, i32 0), i32 2, i8* null)
48  %m_x = bitcast i8* %m_a to i64*
49  %objsz = call i64 @llvm.objectsize.i64.p0i8(i8* %c, i1 false)
50  store i64 %objsz, i64* %m_x
51  ; END perform a bunch of inevitable operations
52
53  ; AND here's the assume:
54  %ptrint = ptrtoint i32* %a to i64
55  %maskedptr = and i64 %ptrint, 31
56  %maskcond = icmp eq i64 %maskedptr, 0
57  tail call void @llvm.assume(i1 %maskcond)
58
59  ret i32 %0
60}
61
62@.str = private unnamed_addr constant [4 x i8] c"sth\00", section "llvm.metadata"
63@.str1 = private unnamed_addr constant [4 x i8] c"t.c\00", section "llvm.metadata"
64
65declare i64 @llvm.objectsize.i64.p0i8(i8*, i1)
66declare i32 @llvm.annotation.i32(i32, i8*, i8*, i32)
67declare i8* @llvm.ptr.annotation.p0i8(i8*, i8*, i8*, i32, i8*)
68
69declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
70declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
71
72declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture)
73declare void @llvm.invariant.end.p0i8({}*, i64, i8* nocapture)
74declare void @llvm.assume(i1)
75