Files
rust/tests/codegen-llvm
Jonathan Brouwer e6ca590153 Rollup merge of #152404 - durin42:llvm-23-instcombine-shrink-constant, r=Mark-Simulacrum
tests: adapt align-offset.rs for InstCombine improvements in LLVM 23

Upstream [has improved InstCombine](https://github.com/llvm/llvm-project/commit/8d2078332c23b10dcf3571adc1a186e5c65f82df) so that it can shrink added constants using known zeroes, which caused a little bit of change in this test. As far as I can tell either output is fine, so we just accept both.

@rustbot label: +llvm-main
2026-02-14 22:11:54 +01:00
..
2025-11-08 10:57:35 -07:00
2026-01-26 13:43:06 -06:00
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