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test(std): Add codegen test for array::from_fn optimization

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This commit adds a new test file 'array-from_fn.rs' to the codegen test suite.
The test checks the behavior of std::array::from_fn under different optimization levels:

1. At opt-level=0 (debug build), it verifies that the core::array::Guard
   is present in the generated code.
2. At opt-level=s (size optimization), it ensures that the Guard is
   optimized out.

This test helps ensure that the compiler correctly optimizes array::from_fn
calls in release builds while maintaining safety checks in debug builds.
This commit is contained in:
burlinchen 2024-08-10 10:44:24 +08:00
parent bca0c5f2a9
commit 3dc083dfd8
1 changed files with 13 additions and 0 deletions
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tests/codegen/array-from_fn.rs Normal file
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//@ revisions: NORMAL OPT
//@ [NORMAL] compile-flags: -C opt-level=0 -C debuginfo=2
//@ [OPT] compile-flags: -C opt-level=s -C debuginfo=0
#![crate_type = "lib"]
#![feature(array_from_fn)]
#[no_mangle]
pub fn iota() -> [u8; 16] {
// OPT-NOT: core..array..Guard
// NORMAL: core..array..Guard
std::array::from_fn(|i| i as _)
}