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rust/tests/codegen/slice-reverse.rs

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MIRI says `reverse` is UB, so replace it with an implementation that LLVM can vectorize For small types with padding, the current implementation is UB because it does integer operations on uninit values. But LLVM has gotten smarter since I wrote the previous implementation in 2017, so remove all the manual magic and just write it in such a way that LLVM will vectorize. This code is much simpler (albeit nuanced) and has very little `unsafe`, and is actually faster to boot!
2021-11-12 12:32:18 +08:00
//@ compile-flags: -O
//@ only-x86_64
Ignore less tests in debug builds
2024-02-24 07:04:01 +08:00
//@ ignore-debug: debug assertions prevent generating shufflevector
MIRI says `reverse` is UB, so replace it with an implementation that LLVM can vectorize For small types with padding, the current implementation is UB because it does integer operations on uninit values. But LLVM has gotten smarter since I wrote the previous implementation in 2017, so remove all the manual magic and just write it in such a way that LLVM will vectorize. This code is much simpler (albeit nuanced) and has very little `unsafe`, and is actually faster to boot!
2021-11-12 12:32:18 +08:00
#![crate_type = "lib"]
// CHECK-LABEL: @slice_reverse_u8
#[no_mangle]
pub fn slice_reverse_u8(slice: &mut [u8]) {
// CHECK-NOT: panic_bounds_check
// CHECK-NOT: slice_end_index_len_fail
// CHECK: shufflevector <{{[0-9]+}} x i8>
// CHECK-NOT: panic_bounds_check
// CHECK-NOT: slice_end_index_len_fail
slice.reverse();
}
// CHECK-LABEL: @slice_reverse_i32
#[no_mangle]
pub fn slice_reverse_i32(slice: &mut [i32]) {
// CHECK-NOT: panic_bounds_check
// CHECK-NOT: slice_end_index_len_fail
// CHECK: shufflevector <{{[0-9]+}} x i32>
// CHECK-NOT: panic_bounds_check
// CHECK-NOT: slice_end_index_len_fail
slice.reverse();
}