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20 lines
605 B
Rust
20 lines
605 B
Rust
//! Regression test for #<https://github.com/rust-lang/rust/issues/120433>:
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//! Multiple bounds checking elision failures
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//! (ensures bounds checks are properly elided,
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//! with no calls to panic_bounds_check in the LLVM IR).
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//@ compile-flags: -C opt-level=3
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#![crate_type = "lib"]
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// CHECK-LABEL: @foo
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// CHECK-NOT: panic_bounds_check
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#[no_mangle]
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pub fn foo(buf: &[u8], alloced_size: usize) -> &[u8] {
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if alloced_size.checked_add(1).map(|total| buf.len() < total).unwrap_or(true) {
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return &[];
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}
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let size = buf[0];
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&buf[1..1 + usize::min(alloced_size, usize::from(size))]
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}
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