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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/codegen/issue-69101-bounds-check.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/codegen/issue-69101-bounds-check.rs')
-rw-r--r-- | tests/codegen/issue-69101-bounds-check.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tests/codegen/issue-69101-bounds-check.rs b/tests/codegen/issue-69101-bounds-check.rs new file mode 100644 index 000000000..a3aca3a29 --- /dev/null +++ b/tests/codegen/issue-69101-bounds-check.rs @@ -0,0 +1,44 @@ +// no-system-llvm +// compile-flags: -O +// ignore-debug: the debug assertions get in the way +#![crate_type = "lib"] + +// Make sure no bounds checks are emitted in the loop when upfront slicing +// ensures that the slices are big enough. +// In particular, bounds checks were not always optimized out if the upfront +// check was for a greater len than the loop requires. +// (i.e. `already_sliced_no_bounds_check` was not always optimized even when +// `already_sliced_no_bounds_check_exact` was) +// CHECK-LABEL: @already_sliced_no_bounds_check +#[no_mangle] +pub fn already_sliced_no_bounds_check(a: &[u8], b: &[u8], c: &mut [u8]) { + // CHECK: slice_end_index_len_fail + // CHECK-NOT: panic_bounds_check + let _ = (&a[..2048], &b[..2048], &mut c[..2048]); + for i in 0..1024 { + c[i] = a[i] ^ b[i]; + } +} + +// CHECK-LABEL: @already_sliced_no_bounds_check_exact +#[no_mangle] +pub fn already_sliced_no_bounds_check_exact(a: &[u8], b: &[u8], c: &mut [u8]) { + // CHECK: slice_end_index_len_fail + // CHECK-NOT: panic_bounds_check + let _ = (&a[..1024], &b[..1024], &mut c[..1024]); + for i in 0..1024 { + c[i] = a[i] ^ b[i]; + } +} + +// Make sure we're checking for the right thing: there can be a panic if the slice is too small. +// CHECK-LABEL: @already_sliced_bounds_check +#[no_mangle] +pub fn already_sliced_bounds_check(a: &[u8], b: &[u8], c: &mut [u8]) { + // CHECK: slice_end_index_len_fail + // CHECK: panic_bounds_check + let _ = (&a[..1023], &b[..2048], &mut c[..2048]); + for i in 0..1024 { + c[i] = a[i] ^ b[i]; + } +} |