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

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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.
This commit is contained in:
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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compiler/rustc_codegen_ssa/src/target_features.rs
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@ -82,6 +82,7 @@ pub fn from_target_feature(
Some(sym::prfchw_target_feature) => rust_features.prfchw_target_feature,
Some(sym::x86_amx_intrinsics) => rust_features.x86_amx_intrinsics,
Some(sym::xop_target_feature) => rust_features.xop_target_feature,
Some(sym::s390x_target_feature) => rust_features.s390x_target_feature,
Some(name) => bug!("unknown target feature gate {}", name),
None => true,
};