1 ; Makes sure that we give up on some pathological cases with inttoptr/ptrtoint 2 ; 3 ; @ptr_test was generated from the following C code: 4 ; void ptr_test() { 5 ; int* A; 6 ; unsigned long RefCopy = 0; 7 ; for (int i = 0; i < 8*sizeof(&A); ++i) { 8 ; if ((unsigned long)&A & (1UL << i)) 9 ; RefCopy |= 1UL << i; 10 ; } 11 ; 12 ; int** AliasA1 = (int**)RefCopy; 13 ; int* ShouldAliasA = *AliasA1; 14 ; } 15 16 ; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s 17 18 ; CHECK: Function: ptr_test 19 define void @ptr_test() #0 { 20 ; CHECK: MayAlias: i32** %A, i32** %ShouldAliasA 21 ; CHECK-NOT: %AliasA1 22 entry: 23 %A = alloca i32*, align 8 24 %RefCopy = alloca i64, align 8 25 %i = alloca i32, align 4 26 %AliasA1 = alloca i32**, align 8 27 %ShouldAliasA = alloca i32*, align 8 28 store i64 0, i64* %RefCopy, align 8 29 store i32 0, i32* %i, align 4 30 br label %for.cond 31 32 for.cond: ; preds = %for.inc, %entry 33 %0 = load i32, i32* %i, align 4 34 %conv = sext i32 %0 to i64 35 %cmp = icmp ult i64 %conv, 64 36 br i1 %cmp, label %for.body, label %for.end 37 38 for.body: ; preds = %for.cond 39 %1 = ptrtoint i32** %A to i64 40 %2 = load i32, i32* %i, align 4 41 %sh_prom = zext i32 %2 to i64 42 %shl = shl i64 1, %sh_prom 43 %and = and i64 %1, %shl 44 %tobool = icmp ne i64 %and, 0 45 br i1 %tobool, label %if.then, label %if.end 46 47 if.then: ; preds = %for.body 48 %3 = load i32, i32* %i, align 4 49 %sh_prom2 = zext i32 %3 to i64 50 %shl3 = shl i64 1, %sh_prom2 51 %4 = load i64, i64* %RefCopy, align 8 52 %or = or i64 %4, %shl3 53 store i64 %or, i64* %RefCopy, align 8 54 br label %if.end 55 56 if.end: ; preds = %if.then, %for.body 57 br label %for.inc 58 59 for.inc: ; preds = %if.end 60 %5 = load i32, i32* %i, align 4 61 %inc = add nsw i32 %5, 1 62 store i32 %inc, i32* %i, align 4 63 br label %for.cond 64 65 for.end: ; preds = %for.cond 66 %6 = load i64, i64* %RefCopy, align 8 67 %7 = inttoptr i64 %6 to i32** 68 store i32** %7, i32*** %AliasA1, align 8 69 %8 = load i32**, i32*** %AliasA1, align 8 70 %9 = load i32*, i32** %8, align 8 71 store i32* %9, i32** %ShouldAliasA, align 8 72 ret void 73 } 74
