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Rollup merge of #127506 - liushuyu:s390x-target-features, r=davidtwco

rustc_target: add known safe s390x target features

This pull request adds known safe target features for s390x (aka IBM Z systems).
Currently, these features are unstable since stabilizing the target features requires submitting proposals.

The `vector` feature was added in IBM Z13 (`arch11`), and this is a SIMD feature for the newer IBM Z systems.
The `backchain` attribute is the IBM Z way of adding frame pointers like unwinding capabilities (the "frame-pointer" switch on IBM Z and IBM POWER platforms will add _emulated_ frame pointers to the binary, which profilers can't use for unwinding the stack).

Both attributes can be applied at the LLVM module or function levels. However, the `backchain` attribute has to be enabled for all the functions in the call stack to get a successful unwind process.
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Trevor Gross 2024-07-22 11:40:19 -05:00 committed by GitHub
commit 5e8e46cbd2
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10 changed files with 46 additions and 4 deletions

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@ -1691,6 +1691,7 @@ symbols! {
rvalue_static_promotion,
rwpi,
s,
s390x_target_feature,
safety,
sanitize,
sanitizer_cfi_generalize_pointers,