| ; Makes sure that we give up on some pathological cases with inttoptr/ptrtoint |
| ; |
| ; @ptr_test was generated from the following C code: |
| ; void ptr_test() { |
| ; int* A; |
| ; unsigned long RefCopy = 0; |
| ; for (int i = 0; i < 8*sizeof(&A); ++i) { |
| ; if ((unsigned long)&A & (1UL << i)) |
| ; RefCopy |= 1UL << i; |
| ; } |
| ; |
| ; int** AliasA1 = (int**)RefCopy; |
| ; int* ShouldAliasA = *AliasA1; |
| ; } |
| |
| ; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s |
| |
| ; CHECK: Function: ptr_test |
| define void @ptr_test() #0 { |
| ; CHECK: MayAlias: i32** %A, i32** %ShouldAliasA |
| ; CHECK-NOT: %AliasA1 |
| entry: |
| %A = alloca i32*, align 8 |
| %RefCopy = alloca i64, align 8 |
| %i = alloca i32, align 4 |
| %AliasA1 = alloca i32**, align 8 |
| %ShouldAliasA = alloca i32*, align 8 |
| store i64 0, i64* %RefCopy, align 8 |
| store i32 0, i32* %i, align 4 |
| br label %for.cond |
| |
| for.cond: ; preds = %for.inc, %entry |
| %0 = load i32, i32* %i, align 4 |
| %conv = sext i32 %0 to i64 |
| %cmp = icmp ult i64 %conv, 64 |
| br i1 %cmp, label %for.body, label %for.end |
| |
| for.body: ; preds = %for.cond |
| %1 = ptrtoint i32** %A to i64 |
| %2 = load i32, i32* %i, align 4 |
| %sh_prom = zext i32 %2 to i64 |
| %shl = shl i64 1, %sh_prom |
| %and = and i64 %1, %shl |
| %tobool = icmp ne i64 %and, 0 |
| br i1 %tobool, label %if.then, label %if.end |
| |
| if.then: ; preds = %for.body |
| %3 = load i32, i32* %i, align 4 |
| %sh_prom2 = zext i32 %3 to i64 |
| %shl3 = shl i64 1, %sh_prom2 |
| %4 = load i64, i64* %RefCopy, align 8 |
| %or = or i64 %4, %shl3 |
| store i64 %or, i64* %RefCopy, align 8 |
| br label %if.end |
| |
| if.end: ; preds = %if.then, %for.body |
| br label %for.inc |
| |
| for.inc: ; preds = %if.end |
| %5 = load i32, i32* %i, align 4 |
| %inc = add nsw i32 %5, 1 |
| store i32 %inc, i32* %i, align 4 |
| br label %for.cond |
| |
| for.end: ; preds = %for.cond |
| %6 = load i64, i64* %RefCopy, align 8 |
| %7 = inttoptr i64 %6 to i32** |
| store i32** %7, i32*** %AliasA1, align 8 |
| %8 = load i32**, i32*** %AliasA1, align 8 |
| %9 = load i32*, i32** %8, align 8 |
| store i32* %9, i32** %ShouldAliasA, align 8 |
| ret void |
| } |