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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:11:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:11:28 +0000 |
commit | 94a0819fe3a0d679c3042a77bfe6a2afc505daea (patch) | |
tree | 2b827afe6a05f3538db3f7803a88c4587fe85648 /src/test/codegen/slice_as_from_ptr_range.rs | |
parent | Adding upstream version 1.64.0+dfsg1. (diff) | |
download | rustc-94a0819fe3a0d679c3042a77bfe6a2afc505daea.tar.xz rustc-94a0819fe3a0d679c3042a77bfe6a2afc505daea.zip |
Adding upstream version 1.66.0+dfsg1.upstream/1.66.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/test/codegen/slice_as_from_ptr_range.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/codegen/slice_as_from_ptr_range.rs b/src/test/codegen/slice_as_from_ptr_range.rs new file mode 100644 index 000000000..0e3fefd97 --- /dev/null +++ b/src/test/codegen/slice_as_from_ptr_range.rs @@ -0,0 +1,23 @@ +// compile-flags: -O +// only-64bit (because we're using [ui]size) +// ignore-debug (because the assertions get in the way) +// min-llvm-version: 15.0 (because this is a relatively new instcombine) + +#![crate_type = "lib"] +#![feature(slice_from_ptr_range)] + +// This is intentionally using a non-power-of-two array length, +// as that's where the optimization differences show up + +// CHECK-LABEL: @flatten_via_ptr_range +#[no_mangle] +pub fn flatten_via_ptr_range(slice_of_arrays: &[[i32; 13]]) -> &[i32] { + // CHECK-NOT: lshr + // CHECK-NOT: udiv + // CHECK: mul nuw nsw i64 %{{.+}}, 13 + // CHECK-NOT: lshr + // CHECK-NOT: udiv + let r = slice_of_arrays.as_ptr_range(); + let r = r.start.cast()..r.end.cast(); + unsafe { core::slice::from_ptr_range(r) } +} |