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Rollup merge of #138689 - jedbrown:jed/nvptx-target-feature, r=ZuseZ4

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add nvptx_target_feature

Tracking issue: #141468 (nvptx), which is part of #44839 (catch-all arches)
The feature gate is `#![feature(nvptx_target_feature)]`

This exposes the target features `sm_20` through `sm_120a` [as defined](https://github.com/llvm/llvm-project/blob/llvmorg-20.1.1/llvm/lib/Target/NVPTX/NVPTX.td#L59-L85) by LLVM.

Cc: ``````@gonzalobg``````
``````@rustbot`````` label +O-NVPTX +A-target-feature
This commit is contained in:
Stuart Cook
2025-08-07 20:49:36 +10:00
committed by GitHub
parent bcd50fd45f 35a485ddd8
commit 1cd368a744
11 changed files with 222 additions and 10 deletions
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15
compiler/rustc_codegen_ssa/src/target_features.rs
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@@ -197,7 +197,10 @@ fn parse_rust_feature_flag<'a>(
/// 2nd component of the return value, respectively).
///
/// `target_base_has_feature` should check whether the given feature (a Rust feature name!) is
/// enabled in the "base" target machine, i.e., without applying `-Ctarget-feature`.
/// enabled in the "base" target machine, i.e., without applying `-Ctarget-feature`. Note that LLVM
/// may consider features to be implied that we do not and vice-versa. We want `cfg` to be entirely
/// consistent with Rust feature implications, and thus only consult LLVM to expand the target CPU
/// to target features.
///
/// We do not have to worry about RUSTC_SPECIFIC_FEATURES here, those are handled elsewhere.
pub fn cfg_target_feature(
@@ -211,7 +214,15 @@ pub fn cfg_target_feature(
.rust_target_features()
.iter()
.filter(|(feature, _, _)| target_base_has_feature(feature))
.map(|(feature, _, _)| Symbol::intern(feature))
.flat_map(|(base_feature, _, _)| {
// Expand the direct base feature into all transitively-implied features. Note that we
// cannot simply use the `implied` field of the tuple since that only contains
// directly-implied features.
//
// Iteration order is irrelevant because we're collecting into an `UnordSet`.
#[allow(rustc::potential_query_instability)]
sess.target.implied_target_features(base_feature).into_iter().map(|f| Symbol::intern(f))
})
.collect();
// Add enabled and remove disabled features.