20 lines
457 B
Rust
20 lines
457 B
Rust
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// in Rust 1.73, -O and opt-level=3 optimizes differently
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//@ compile-flags: -C opt-level=3
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//@ min-llvm-version: 17
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#![crate_type = "lib"]
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use std::cmp::max;
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#[no_mangle]
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// CHECK-LABEL: @foo
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// CHECK-NOT: slice_start_index_len_fail
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// CHECK-NOT: unreachable
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pub fn foo(v: &mut Vec<u8>, size: usize)-> Option<&mut [u8]> {
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if v.len() > max(1, size) {
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let start = v.len() - size;
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Some(&mut v[start..])
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} else {
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None
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}
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}
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