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Auto merge of rust-lang#101232 - nikic:issue-98294, r=Mark-Simulacrum
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Add test for rust-lang#98294

Add a test to make that the failure condition for this pattern is optimized away.

Fixes rust-lang#98294.
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bors committed Sep 7, 2022
2 parents ff479b1 + cbf3b24 commit 0568b0a
Showing 1 changed file with 19 additions and 0 deletions.
19 changes: 19 additions & 0 deletions src/test/codegen/issue-98294-get-mut-copy-from-slice-opt.rs
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// min-llvm-version: 15.0.0
// ignore-debug: The debug assertions get in the way
// compile-flags: -O

#![crate_type = "lib"]

// There should be no calls to panic / len_mismatch_fail.

#[no_mangle]
pub fn test(a: &mut [u8], offset: usize, bytes: &[u8]) {
// CHECK-LABEL: @test(
// CHECK-NOT: call
// CHECK: call void @llvm.memcpy
// CHECK-NOT: call
// CHECK: }
if let Some(dst) = a.get_mut(offset..offset + bytes.len()) {
dst.copy_from_slice(bytes);
}
}

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