tests/codegen/match-optimizes-away.rs

   1 //
   2 // no-system-llvm
   3 // compile-flags: -O
   4 #![crate_type="lib"]
   5
   6 pub enum Three { A, B, C }
   7
   8 #[repr(u16)]
   9 pub enum Four { A, B, C, D }
  10
  11 #[no_mangle]
  12 pub fn three_valued(x: Three) -> Three {
  13     // CHECK-LABEL: @three_valued
  14     // CHECK-NEXT: {{^.*:$}}
  15     // CHECK-NEXT: ret i8 %0
  16     match x {
  17         Three::A => Three::A,
  18         Three::B => Three::B,
  19         Three::C => Three::C,
  20     }
  21 }
  22
  23 #[no_mangle]
  24 pub fn four_valued(x: Four) -> Four {
  25     // CHECK-LABEL: @four_valued
  26     // CHECK-NEXT: {{^.*:$}}
  27     // CHECK-NEXT: ret i16 %0
  28     match x {
  29         Four::A => Four::A,
  30         Four::B => Four::B,
  31         Four::C => Four::C,
  32         Four::D => Four::D,
  33     }
  34 }