24 lines
767 B
Rust
24 lines
767 B
Rust
|
// 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) }
|
||
|
|
}
|