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| author | Guillaume Gomez <guillaume1.gomez@gmail.com> | 2025-07-21 14:34:12 +0200 |
|---|---|---|
| committer | Guillaume Gomez <guillaume1.gomez@gmail.com> | 2025-07-22 14:28:48 +0200 |
| commit | a27f3e3fd1e4d16160f8885b6b06665b5319f56c (patch) | |
| tree | b033935392cbadf6f85d2dbddf433a88e323aeeb /tests/codegen-llvm/slice-iter-len-eq-zero.rs | |
| parent | ed93c1783b404d728d4809973a0550eb33cd293f (diff) | |
| download | rust-a27f3e3fd1e4d16160f8885b6b06665b5319f56c.tar.gz rust-a27f3e3fd1e4d16160f8885b6b06665b5319f56c.zip | |
Rename `tests/codegen` into `tests/codegen-llvm`
Diffstat (limited to 'tests/codegen-llvm/slice-iter-len-eq-zero.rs')
| -rw-r--r-- | tests/codegen-llvm/slice-iter-len-eq-zero.rs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/tests/codegen-llvm/slice-iter-len-eq-zero.rs b/tests/codegen-llvm/slice-iter-len-eq-zero.rs new file mode 100644 index 00000000000..6998d98e498 --- /dev/null +++ b/tests/codegen-llvm/slice-iter-len-eq-zero.rs @@ -0,0 +1,60 @@ +//@ compile-flags: -Copt-level=3 +//@ needs-deterministic-layouts (opposite scalar pair orders breaks it) +#![crate_type = "lib"] + +type Demo = [u8; 3]; + +// CHECK-LABEL: @slice_iter_len_eq_zero +#[no_mangle] +pub fn slice_iter_len_eq_zero(y: std::slice::Iter<'_, Demo>) -> bool { + // CHECK-NOT: sub + // CHECK: %[[RET:.+]] = icmp eq ptr {{%y.0, %y.1|%y.1, %y.0}} + // CHECK: ret i1 %[[RET]] + y.len() == 0 +} + +// CHECK-LABEL: @slice_iter_len_eq_zero_ref +#[no_mangle] +pub fn slice_iter_len_eq_zero_ref(y: &mut std::slice::Iter<'_, Demo>) -> bool { + // CHECK-NOT: sub + // CHECK: %[[A:.+]] = load ptr + // CHECK-SAME: !nonnull + // CHECK: %[[B:.+]] = load ptr + // CHECK-SAME: !nonnull + // CHECK: %[[RET:.+]] = icmp eq ptr %[[A]], %[[B]] + // CHECK: ret i1 %[[RET]] + y.len() == 0 +} + +struct MyZST; + +// CHECK-LABEL: @slice_zst_iter_len_eq_zero +#[no_mangle] +pub fn slice_zst_iter_len_eq_zero(y: std::slice::Iter<'_, MyZST>) -> bool { + // CHECK: %[[RET:.+]] = icmp eq ptr %y.1, null + // CHECK: ret i1 %[[RET]] + y.len() == 0 +} + +// CHECK-LABEL: @slice_zst_iter_len_eq_zero_ref +#[no_mangle] +pub fn slice_zst_iter_len_eq_zero_ref(y: &mut std::slice::Iter<'_, MyZST>) -> bool { + // CHECK: %[[LEN:.+]] = load ptr + // CHECK-NOT: !nonnull + // CHECK: %[[RET:.+]] = icmp eq ptr %[[LEN]], null + // CHECK: ret i1 %[[RET]] + y.len() == 0 +} + +// CHECK-LABEL: @array_into_iter_len_eq_zero +#[no_mangle] +pub fn array_into_iter_len_eq_zero(y: std::array::IntoIter<Demo, 123>) -> bool { + // This should be able to just check that the indexes are equal, and not + // need any subtractions or comparisons to handle `start > end`. + + // CHECK-NOT: icmp + // CHECK-NOT: sub + // CHECK: %_0 = icmp eq {{i16|i32|i64}} + // CHECK: ret i1 %_0 + y.len() == 0 +} |