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20 lines
510 B
Rust
20 lines
510 B
Rust
//@ compile-flags: -O
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//@ min-llvm-version: 18
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#![crate_type = "lib"]
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use std::ptr::NonNull;
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// CHECK-LABEL: @slice_ptr_len_1
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// CHECK-NEXT: {{.*}}:
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// CHECK-NEXT: ret {{i(32|64)}} %ptr.1
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#[no_mangle]
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pub fn slice_ptr_len_1(ptr: *const [u8]) -> usize {
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let ptr = ptr.cast_mut();
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if let Some(ptr) = NonNull::new(ptr) {
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ptr.len()
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} else {
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// We know ptr is null, so we know ptr.wrapping_byte_add(1) is not null.
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NonNull::new(ptr.wrapping_byte_add(1)).unwrap().len()
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}
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}
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