tests/codegen/try_question_mark_nop.rs

   1 // min-llvm-version: 15.0
   2 // compile-flags: -O -Z merge-functions=disabled --edition=2021
   3 // only-x86_64
   4
   5 #![crate_type = "lib"]
   6 #![feature(try_blocks)]
   7
   8 // These are now NOPs in LLVM 15, presumably thanks to nikic's change mentioned in
   9 // <https://github.com/rust-lang/rust/issues/85133#issuecomment-1072168354>.
  10 // Unfortunately, as of 2022-08-17 they're not yet nops for `u64`s nor `Option`.
  11
  12 use std::ops::ControlFlow::{self, Continue, Break};
  13
  14 // CHECK-LABEL: @result_nop_match_32
  15 #[no_mangle]
  16 pub fn result_nop_match_32(x: Result<i32, u32>) -> Result<i32, u32> {
  17     // CHECK: start
  18     // CHECK-NEXT: ret i64 %0
  19     match x {
  20         Ok(x) => Ok(x),
  21         Err(x) => Err(x),
  22     }
  23 }
  24
  25 // CHECK-LABEL: @result_nop_traits_32
  26 #[no_mangle]
  27 pub fn result_nop_traits_32(x: Result<i32, u32>) -> Result<i32, u32> {
  28     // CHECK: start
  29     // CHECK-NEXT: ret i64 %0
  30     try {
  31         x?
  32     }
  33 }
  34
  35 // CHECK-LABEL: @control_flow_nop_match_32
  36 #[no_mangle]
  37 pub fn control_flow_nop_match_32(x: ControlFlow<i32, u32>) -> ControlFlow<i32, u32> {
  38     // CHECK: start
  39     // CHECK-NEXT: ret i64 %0
  40     match x {
  41         Continue(x) => Continue(x),
  42         Break(x) => Break(x),
  43     }
  44 }
  45
  46 // CHECK-LABEL: @control_flow_nop_traits_32
  47 #[no_mangle]
  48 pub fn control_flow_nop_traits_32(x: ControlFlow<i32, u32>) -> ControlFlow<i32, u32> {
  49     // CHECK: start
  50     // CHECK-NEXT: ret i64 %0
  51     try {
  52         x?
  53     }
  54 }