Files
rust/tests/ui
Jubilee 6bc7be5efa Rollup merge of #132516 - taiki-e:asm-ui, r=workingjubilee
Add bad-reg inline assembly ui test for RISC-V and s390x

https://github.com/rust-lang/rust/pull/131341#discussion_r1826555431

> Btw, such unsupported registers are present in most architectures, but only aarch64/arm64ec, x86_64, and not yet merged [sparc/sparc64](https://github.com/rust-lang/rust/pull/132472/files#diff-02aebda3376c2b020265137f9ce2c387669ca5cfecd7d60494275c2387db5114) (and powerpc/powerpc64 by this PR) currently have ui tests for them.  I plan to add tests for other arches later.

Starting with RISC-V and s390x, which I'm familiar with and relatively easy to check for correctness.

(Relevant rustc code are supported_types/def_regs/overlapping_regs in [compiler/rustc_target/src/asm/riscv.rs](https://github.com/rust-lang/rust/blob/588a4203508ed7c76750c96b482641261630ed36/compiler/rustc_target/src/asm/riscv.rs) and [compiler/rustc_target/src/asm/s390x.rs](https://github.com/rust-lang/rust/blob/588a4203508ed7c76750c96b482641261630ed36/compiler/rustc_target/src/asm/s390x.rs).)

r? workingjubilee

`@rustbot` label +A-inline-assembly
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UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.

As part of an on-going effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.