mirror of https://github.com/rust-lang/rust
28 lines
1011 B
Rust
28 lines
1011 B
Rust
//@ compile-flags: -Cno-prepopulate-passes -Copt-level=0 -Cdebug-assertions=no
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// This test ensures that in a debug build which turns off debug assertions, we do not monomorphize
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// any of the standard library's unsafe precondition checks.
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// The naive codegen of those checks contains the actual check underneath an `if false`, which
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// could be optimized out if optimizations are enabled. But if we rely on optimizations to remove
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// panic branches, then we can't link compiler_builtins without optimizing it, which means that
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// -Zbuild-std doesn't work with -Copt-level=0.
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//
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// In other words, this tests for a mandatory optimization.
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#![crate_type = "lib"]
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use std::ptr::NonNull;
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// CHECK-LABEL: ; core::ptr::non_null::NonNull<T>::new_unchecked
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// CHECK-NOT: call
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// CHECK: }
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// CHECK-LABEL: @nonnull_new
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#[no_mangle]
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pub unsafe fn nonnull_new(ptr: *mut u8) -> NonNull<u8> {
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// CHECK: ; call core::ptr::non_null::NonNull<T>::new_unchecked
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unsafe {
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NonNull::new_unchecked(ptr)
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}
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}
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