Files
rust/tests/codegen-llvm
bors 41198cb965 Auto merge of #148034 - dianqk:matchbr-copy, r=cjgillot
Simplify the canonical enum clone branches to a copy statement

I have overhauled MatchBranchSimplification in this PR. This pass tries to unify statements one by one, which is more readable and extensible.

This PR also unifies the following pattern that is mostly generated by GVN into one basic block that contains the copy statement:

```rust
match a {
    Foo::A(_) => *a,
    Foo::B => Foo::B
}
```

Fixes https://github.com/rust-lang/rust/issues/128081.
2026-02-19 09:56:26 +00:00
..
2025-11-08 10:57:35 -07:00
2026-01-26 13:43:06 -06:00
2026-02-17 10:11:01 +08:00
2025-08-15 16:42:21 +00:00

The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb