rust/src/test/codegen/vec-calloc.rs, branch try

Move /src/test to /tests

2023-01-11T09:32:08+00:00

Do the `calloc` optimization for `Option`

2022-10-02T19:26:58+00:00

Inspired by .

codegen: use new {re,de,}allocator annotations in llvm

2022-07-26T13:43:28+00:00

This obviates the patch that teaches LLVM internals about _rust_{re,de}alloc functions by putting annotations directly in the IR for the optimizer. The sole test change is required to anchor FileCheck to the body of the `box_uninitialized` method, so it doesn't see the `allocalign` on `__rust_alloc` and get mad about the string `alloca` showing up. Since I was there anyway, I added some checks on the attributes to prove the right attributes got set. While we're here, we also emit allocator attributes on __rust_alloc_zeroed. This should allow LLVM to perform more optimizations for zeroed blocks, and probably fixes #90032. [This comment](https://github.com/rust-lang/rust/issues/24194#issuecomment-308791157) mentions "weird UB-like behaviour with bitvec iterators in rustc_data_structures" so we may need to back this change out if things go wrong. The new test cases require LLVM 15, so we copy them into LLVM 14-supporting versions, which we can delete when we drop LLVM 14.

Support vec zero-alloc optimization for tuples and byte arrays

2022-07-24T19:56:39+00:00

* Implement IsZero trait for tuples up to 8 IsZero elements; * Implement IsZero for u8/i8, leading to implementation of it for arrays of them too; * Add more codegen tests for this optimization. * Lower size of array for IsZero trait because it fails to inline checks

Tweak the calloc optimization to only apply to shortish-arrays

2022-05-02T05:28:11+00:00