Files
rust/tests/codegen
Chris Denton f1b31ae8df Rollup merge of #139177 - fneddy:fix_s390x_codegen_bswap, r=Mark-Simulacrum
Use -C target-cpu=z13 on s390x vector test

currently we see a regression in the `dont-shuffle-bswaps.rs` on s390x. This is due to, the default s390x cpu is set to z10 [here](https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/targets/s390x_unknown_linux_gnu.rs#L9) which does not have vector instructions implemented. To make the test pass we need to create an extra test revision and set target-cpu at least to `z13`.
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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