tests/mir-opt/pre-codegen/slice_iter.rs

   1 // compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
   2 // only-64bit
   3 // ignore-debug
   4 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
   5
   6 #![crate_type = "lib"]
   7
   8 // When this test was added, the MIR for `next` was 174 lines just for the basic
   9 // blocks -- far more if you counted the scopes.  The goal of having this here
  10 // is to hopefully keep it a reasonable size, ideally eventually small enough
  11 // that the mir inliner would actually be willing to inline it, since it's an
  12 // important building block and usually very few *backend* instructions.
  13
  14 // As such, feel free to `--bless` whatever changes you get here, so long as
  15 // doing so doesn't add substantially more MIR.
  16
  17 // EMIT_MIR slice_iter.slice_iter_next.PreCodegen.after.mir
  18 pub fn slice_iter_next<'a, T>(it: &mut std::slice::Iter<'a, T>) -> Option<&'a T> {
  19     it.next()
  20 }
  21
  22 // EMIT_MIR slice_iter.slice_iter_mut_next_back.PreCodegen.after.mir
  23 pub fn slice_iter_mut_next_back<'a, T>(it: &mut std::slice::IterMut<'a, T>) -> Option<&'a mut T> {
  24     it.next_back()
  25 }
  26
  27 // EMIT_MIR slice_iter.forward_loop.PreCodegen.after.mir
  28 pub fn forward_loop<'a, T>(slice: &'a [T], f: impl Fn(&T)) {
  29     for x in slice.iter() {
  30         f(x)
  31     }
  32 }
  33
  34 // EMIT_MIR slice_iter.reverse_loop.PreCodegen.after.mir
  35 pub fn reverse_loop<'a, T>(slice: &'a [T], f: impl Fn(&T)) {
  36     for x in slice.iter().rev() {
  37         f(x)
  38     }
  39 }
  40
  41 // EMIT_MIR slice_iter.enumerated_loop.PreCodegen.after.mir
  42 pub fn enumerated_loop<'a, T>(slice: &'a [T], f: impl Fn(usize, &T)) {
  43     for (i, x) in slice.iter().enumerate() {
  44         f(i, x)
  45     }
  46 }
  47
  48 // EMIT_MIR slice_iter.range_loop.PreCodegen.after.mir
  49 pub fn range_loop<'a, T>(slice: &'a [T], f: impl Fn(usize, &T)) {
  50     for i in 0..slice.len() {
  51         let x = &slice[i];
  52         f(i, x)
  53     }
  54 }