1 files changed, 73 insertions, 0 deletions
diff --git a/test/Analysis/CFLAliasAnalysis/branch-alias.ll b/test/Analysis/CFLAliasAnalysis/branch-alias.ll
new file mode 100644
index 0000000..8307462
--- /dev/null
+++ b/test/Analysis/CFLAliasAnalysis/branch-alias.ll
@@ -0,0 +1,73 @@
+; 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 -cfl-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
+}