Files
rust/tests/ui
Matthias Krüger 8e31e98ff9 Rollup merge of #130555 - hegza:rv32e, r=workingjubilee
Initial support for riscv32{e|em|emc}_unknown_none_elf

We have a research prototype of an RV32EMC target and have been successfully running the e, em, emc programs on it. I'm hoping upstreaming this configuration would make the target maintenance slightly easier.

Configuration is based on the respective {i, im, imc} variants. As defined in RISC-V Unprivileged Spec. 20191213, the only change in RVE wrt. RVI is to reduce the number of integer registers to 16 (x0-x15), which also implies

- 2 callee saved registers instead of 12
- 32-bit / 4-byte stack alignment instead of 128 bits / 16 bytes

My initial presumption is that this will not impact how the target is defined for the compiler but only becomes relevant at the runtime level. I am willing to investigate, though.

EDIT: LLVM is now told about the presumed 32-bit stack alignment.

`@Disasm` `@romancardenas`
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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>.