[llvm-bugs] [Bug 33623] New: llvm-diff finds differences in the same code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33623

            Bug ID: 33623
           Summary: llvm-diff finds differences in the same code
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yonghyun.kim at sf.snu.ac.kr
                CC: llvm-bugs at lists.llvm.org

Created attachment 18727
  --> https://bugs.llvm.org/attachment.cgi?id=18727&action=edit
naive.ll in comment

```
$ ./llvm-diff -version
LLVM (http://llvm.org/):
  LLVM version 5.0.0svn
  DEBUG build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: ivybridge
```

```
$ ./llvm-diff naive.ll naive.ll
in function foo:
  in block %entry:
    >   store <2 x i64*> <i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0), i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0)>, <2 x i64*>* %tmp0, align 8
    <   store <2 x i64*> <i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0), i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0)>, <2 x i64*>* %tmp0, align 8
```

```
$ cat naive.ll
%struct.it = type { i64, i64* }

@a_vector = internal global [2 x i64] zeroinitializer, align 16

define i32 @foo(%struct.it* %it) {

entry:
  %a = getelementptr inbounds %struct.it, %struct.it* %it, i64 0, i32 1
  %tmp0 = bitcast i64** %a to <2 x i64*>*
  store <2 x i64*> <i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0), i64* getelementptr inbounds ([2 x i64], [2 x i64]*
@a_vector, i64 0, i64 0)>, <2 x i64*>* %tmp0, align 8

  ret i32 0
}
```

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