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Rollup merge of #119365 - nbdd0121:asm-goto, r=Amanieu

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Add asm goto support to `asm!`

Tracking issue: #119364

This PR implements asm-goto support, using the syntax described in "future possibilities" section of [RFC2873](https://rust-lang.github.io/rfcs/2873-inline-asm.html#asm-goto).

Currently I have only implemented the `label` part, not the `fallthrough` part (i.e. fallthrough is implicit). This doesn't reduce the expressive though, since you can use label-break to get arbitrary control flow or simply set a value and rely on jump threading optimisation to get the desired control flow. I can add that later if deemed necessary.

r? ``@Amanieu``
cc ``@ojeda``
This commit is contained in:
Matthias Krüger
2024-03-08 08:19:17 +01:00
committed by GitHub
parent 876847bed8 0ee0f290a6
commit d774fbea7c
76 changed files with 857 additions and 200 deletions
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compiler/rustc_builtin_macros/messages.ftl
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@@ -19,6 +19,8 @@ builtin_macros_asm_expected_other = expected operand, {$is_global_asm ->
builtin_macros_asm_explicit_register_name = explicit register arguments cannot have names
builtin_macros_asm_mayunwind = asm labels are not allowed with the `may_unwind` option
builtin_macros_asm_modifier_invalid = asm template modifier must be a single character
builtin_macros_asm_mutually_exclusive = the `{$opt1}` and `{$opt2}` options are mutually exclusive