gistfile1.txt

# BAD CASE

Unoptimized:

```
  %15 = bitcast %"enum parse::token::token[#0]"* %3 to { i64, i8 }*
  %16 = getelementptr inbounds { i64, i8 }* %15, i32 0, i32 0
  %17 = load i64* %16
  switch i64 %17, label %match_else28672 [
    i64 35, label %match_case28673
  ]
```

Optimized:

```
  %10 = bitcast i8* addrspace(1)* %9 to i192 addrspace(1)*
  %srcval = load i192 addrspace(1)* %10, align 1
  %11 = and i192 %srcval, 340282366920938463481821351505477763071
  %12 = icmp eq i192 %11, 35
  br i1 %12, label %call28676, label %case_body28671
```

What confuses me:

340282366920938463481821351505477763071 is 
  '10000000000000000ffffffffffffffff'
in hex, which seems to have an extra bit, near as I can tell.

what I would expect:

  %10 = bitcast i8* addrspace(1)* %9 to i192 addrspace(1)*
  %srcval = load i192 addrspace(1)* %10, align 1
  %11 = and i192 %srcval, 0xFFFF_FFFF_FFFF_FFFF
  %12 = icmp eq i192 %11, 35
  br i1 %12, label %call28676, label %case_body28671