Auto merge of rust-lang#125358 - matthiaskrgr:rollup-mx841tg, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#124570 (Miscellaneous cleanups)
 - rust-lang#124772 (Refactor documentation for Apple targets)
 - rust-lang#125011 (Add opt-for-size core lib feature flag)
 - rust-lang#125218 (Migrate `run-make/no-intermediate-extras` to new `rmake.rs`)
 - rust-lang#125225 (Use functions from `crt_externs.h` on iOS/tvOS/watchOS/visionOS)
 - rust-lang#125266 (compiler: add simd_ctpop intrinsic)
 - rust-lang#125348 (Small fixes to `std::path::absolute` docs)

Failed merges:

 - rust-lang#125296 (Fix `unexpected_cfgs` lint on std)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_codegen_cranelift/src/intrinsics/simd.rs

@@ -348,6 +348,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         | sym::simd_bswap
         | sym::simd_bitreverse
         | sym::simd_ctlz
+        | sym::simd_ctpop
         | sym::simd_cttz => {
             intrinsic_args!(fx, args => (a); intrinsic);
 
@@ -367,6 +368,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                 (ty::Uint(_) | ty::Int(_), sym::simd_bswap) => fx.bcx.ins().bswap(lane),
                 (ty::Uint(_) | ty::Int(_), sym::simd_bitreverse) => fx.bcx.ins().bitrev(lane),
                 (ty::Uint(_) | ty::Int(_), sym::simd_ctlz) => fx.bcx.ins().clz(lane),
+                (ty::Uint(_) | ty::Int(_), sym::simd_ctpop) => fx.bcx.ins().popcnt(lane),
                 (ty::Uint(_) | ty::Int(_), sym::simd_cttz) => fx.bcx.ins().ctz(lane),
 
                 _ => unreachable!(),

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -2336,7 +2336,10 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
     }
 
     // Unary integer intrinsics
-    if matches!(name, sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctlz | sym::simd_cttz) {
+    if matches!(
+        name,
+        sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctlz | sym::simd_ctpop | sym::simd_cttz
+    ) {
         let vec_ty = bx.cx.type_vector(
             match *in_elem.kind() {
                 ty::Int(i) => bx.cx.type_int_from_ty(i),
@@ -2354,31 +2357,38 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
             sym::simd_bswap => "bswap",
             sym::simd_bitreverse => "bitreverse",
             sym::simd_ctlz => "ctlz",
+            sym::simd_ctpop => "ctpop",
             sym::simd_cttz => "cttz",
             _ => unreachable!(),
         };
         let int_size = in_elem.int_size_and_signed(bx.tcx()).0.bits();
         let llvm_intrinsic = &format!("llvm.{}.v{}i{}", intrinsic_name, in_len, int_size,);
 
-        return if name == sym::simd_bswap && int_size == 8 {
+        return match name {
             // byte swap is no-op for i8/u8
-            Ok(args[0].immediate())
-        } else if matches!(name, sym::simd_ctlz | sym::simd_cttz) {
-            let fn_ty = bx.type_func(&[vec_ty, bx.type_i1()], vec_ty);
-            let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
-            Ok(bx.call(
-                fn_ty,
-                None,
-                None,
-                f,
-                &[args[0].immediate(), bx.const_int(bx.type_i1(), 0)],
-                None,
-                None,
-            ))
-        } else {
-            let fn_ty = bx.type_func(&[vec_ty], vec_ty);
-            let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
-            Ok(bx.call(fn_ty, None, None, f, &[args[0].immediate()], None, None))
+            sym::simd_bswap if int_size == 8 => Ok(args[0].immediate()),
+            sym::simd_ctlz | sym::simd_cttz => {
+                // for the (int, i1 immediate) pair, the second arg adds `(0, true) => poison`
+                let fn_ty = bx.type_func(&[vec_ty, bx.type_i1()], vec_ty);
+                let dont_poison_on_zero = bx.const_int(bx.type_i1(), 0);
+                let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
+                Ok(bx.call(
+                    fn_ty,
+                    None,
+                    None,
+                    f,
+                    &[args[0].immediate(), dont_poison_on_zero],
+                    None,
+                    None,
+                ))
+            }
+            sym::simd_bswap | sym::simd_bitreverse | sym::simd_ctpop => {
+                // simple unary argument cases
+                let fn_ty = bx.type_func(&[vec_ty], vec_ty);
+                let f = bx.declare_cfn(llvm_intrinsic, llvm::UnnamedAddr::No, fn_ty);
+                Ok(bx.call(fn_ty, None, None, f, &[args[0].immediate()], None, None))
+            }
+            _ => unreachable!(),
         };
     }
 

compiler/rustc_const_eval/src/lib.rs

@@ -1,9 +1,3 @@
-/*!
-
-Rust MIR: a lowered representation of Rust.
-
-*/
-
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![feature(rustdoc_internals)]

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -607,6 +607,7 @@ pub fn check_intrinsic_type(
             | sym::simd_bitreverse
             | sym::simd_ctlz
             | sym::simd_cttz
+            | sym::simd_ctpop
             | sym::simd_fsqrt
             | sym::simd_fsin
             | sym::simd_fcos

compiler/rustc_metadata/src/lib.rs

@@ -1,21 +1,22 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::potential_query_instability)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
+#![feature(coroutines)]
 #![feature(decl_macro)]
 #![feature(error_iter)]
 #![feature(extract_if)]
-#![feature(coroutines)]
+#![feature(if_let_guard)]
 #![feature(iter_from_coroutine)]
 #![feature(let_chains)]
-#![feature(if_let_guard)]
-#![feature(proc_macro_internals)]
 #![feature(macro_metavar_expr)]
 #![feature(min_specialization)]
-#![feature(trusted_len)]
-#![feature(try_blocks)]
 #![feature(never_type)]
-#![allow(rustc::potential_query_instability)]
+#![feature(proc_macro_internals)]
+#![feature(rustdoc_internals)]
+#![feature(trusted_len)]
+// tidy-alphabetical-end
 
 extern crate proc_macro;
 

compiler/rustc_metadata/src/rmeta/mod.rs

@@ -1,15 +1,13 @@
 use crate::creader::CrateMetadataRef;
-use decoder::Metadata;
+pub(crate) use decoder::{CrateMetadata, CrateNumMap, MetadataBlob};
+use decoder::{DecodeContext, Metadata};
 use def_path_hash_map::DefPathHashMapRef;
-use rustc_data_structures::fx::FxHashMap;
-use rustc_macros::{Decodable, Encodable, TyDecodable, TyEncodable};
-use rustc_middle::middle::debugger_visualizer::DebuggerVisualizerFile;
-use rustc_middle::middle::lib_features::FeatureStability;
-use table::TableBuilder;
-
+use encoder::EncodeContext;
+pub use encoder::{encode_metadata, rendered_const, EncodedMetadata};
 use rustc_ast as ast;
 use rustc_ast::expand::StrippedCfgItem;
 use rustc_attr as attr;
+use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::svh::Svh;
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, DefKind, DocLinkResMap};
@@ -18,10 +16,13 @@ use rustc_hir::definitions::DefKey;
 use rustc_hir::lang_items::LangItem;
 use rustc_index::bit_set::BitSet;
 use rustc_index::IndexVec;
+use rustc_macros::{Decodable, Encodable, TyDecodable, TyEncodable};
 use rustc_macros::{MetadataDecodable, MetadataEncodable};
 use rustc_middle::metadata::ModChild;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
+use rustc_middle::middle::debugger_visualizer::DebuggerVisualizerFile;
 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo};
+use rustc_middle::middle::lib_features::FeatureStability;
 use rustc_middle::middle::resolve_bound_vars::ObjectLifetimeDefault;
 use rustc_middle::mir;
 use rustc_middle::trivially_parameterized_over_tcx;
@@ -33,20 +34,14 @@ use rustc_serialize::opaque::FileEncoder;
 use rustc_session::config::SymbolManglingVersion;
 use rustc_session::cstore::{CrateDepKind, ForeignModule, LinkagePreference, NativeLib};
 use rustc_span::edition::Edition;
-use rustc_span::hygiene::{ExpnIndex, MacroKind};
+use rustc_span::hygiene::{ExpnIndex, MacroKind, SyntaxContextData};
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::{self, ExpnData, ExpnHash, ExpnId, Span};
 use rustc_target::abi::{FieldIdx, VariantIdx};
 use rustc_target::spec::{PanicStrategy, TargetTriple};
-
 use std::marker::PhantomData;
 use std::num::NonZero;
-
-use decoder::DecodeContext;
-pub(crate) use decoder::{CrateMetadata, CrateNumMap, MetadataBlob};
-use encoder::EncodeContext;
-pub use encoder::{encode_metadata, rendered_const, EncodedMetadata};
-use rustc_span::hygiene::SyntaxContextData;
+use table::TableBuilder;
 
 mod decoder;
 mod def_path_hash_map;

compiler/rustc_middle/src/lib.rs

@@ -22,46 +22,46 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::potential_query_instability)]
+#![allow(rustc::untranslatable_diagnostic)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(min_exhaustive_patterns)]
-#![feature(rustdoc_internals)]
 #![feature(allocator_api)]
 #![feature(array_windows)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(closure_track_caller)]
-#![feature(core_intrinsics)]
+#![feature(const_option)]
 #![feature(const_type_name)]
-#![feature(discriminant_kind)]
+#![feature(core_intrinsics)]
 #![feature(coroutines)]
-#![feature(stmt_expr_attributes)]
+#![feature(decl_macro)]
+#![feature(discriminant_kind)]
+#![feature(extern_types)]
+#![feature(extract_if)]
 #![feature(if_let_guard)]
+#![feature(intra_doc_pointers)]
 #![feature(iter_from_coroutine)]
+#![feature(let_chains)]
+#![feature(macro_metavar_expr)]
+#![feature(min_exhaustive_patterns)]
+#![feature(min_specialization)]
 #![feature(negative_impls)]
 #![feature(never_type)]
-#![feature(extern_types)]
 #![feature(new_uninit)]
-#![feature(let_chains)]
-#![feature(min_specialization)]
-#![feature(trusted_len)]
-#![feature(type_alias_impl_trait)]
-#![feature(strict_provenance)]
+#![feature(ptr_alignment_type)]
 #![feature(rustc_attrs)]
-#![feature(control_flow_enum)]
+#![feature(rustdoc_internals)]
+#![feature(strict_provenance)]
 #![feature(trait_upcasting)]
+#![feature(trusted_len)]
 #![feature(try_blocks)]
-#![feature(decl_macro)]
-#![feature(extract_if)]
-#![feature(intra_doc_pointers)]
+#![feature(type_alias_impl_trait)]
 #![feature(yeet_expr)]
-#![feature(const_option)]
-#![feature(ptr_alignment_type)]
-#![feature(macro_metavar_expr)]
-#![allow(internal_features)]
-#![allow(rustc::potential_query_instability)]
-#![allow(rustc::diagnostic_outside_of_impl)]
-#![allow(rustc::untranslatable_diagnostic)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;

compiler/rustc_passes/src/check_attr.rs

@@ -42,12 +42,9 @@ use std::collections::hash_map::Entry;
 
 #[derive(LintDiagnostic)]
 #[diag(passes_diagnostic_diagnostic_on_unimplemented_only_for_traits)]
-pub struct DiagnosticOnUnimplementedOnlyForTraits;
+struct DiagnosticOnUnimplementedOnlyForTraits;
 
-pub(crate) fn target_from_impl_item<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    impl_item: &hir::ImplItem<'_>,
-) -> Target {
+fn target_from_impl_item<'tcx>(tcx: TyCtxt<'tcx>, impl_item: &hir::ImplItem<'_>) -> Target {
     match impl_item.kind {
         hir::ImplItemKind::Const(..) => Target::AssocConst,
         hir::ImplItemKind::Fn(..) => {
@@ -99,7 +96,7 @@ struct CheckAttrVisitor<'tcx> {
 }
 
 impl<'tcx> CheckAttrVisitor<'tcx> {
-    pub fn dcx(&self) -> &'tcx DiagCtxt {
+    fn dcx(&self) -> &'tcx DiagCtxt {
         self.tcx.dcx()
     }
 

compiler/rustc_passes/src/lang_items.rs

@@ -149,8 +149,9 @@ impl<'ast, 'tcx> LanguageItemCollector<'ast, 'tcx> {
                 }
             };
 
-            // When there's a duplicate lang item, something went very wrong and there's no value in recovering or doing anything.
-            // Give the user the one message to let them debug the mess they created and then wish them farewell.
+            // When there's a duplicate lang item, something went very wrong and there's no value
+            // in recovering or doing anything. Give the user the one message to let them debug the
+            // mess they created and then wish them farewell.
             self.tcx.dcx().emit_fatal(DuplicateLangItem {
                 local_span: item_span,
                 lang_item_name,

compiler/rustc_span/src/symbol.rs

@@ -1682,6 +1682,7 @@ symbols! {
         simd_cast_ptr,
         simd_ceil,
         simd_ctlz,
+        simd_ctpop,
         simd_cttz,
         simd_div,
         simd_eq,

compiler/rustc_target/src/spec/base/apple/mod.rs

@@ -272,6 +272,7 @@ fn macos_default_deployment_target(arch: Arch) -> (u32, u32) {
 
 fn macos_deployment_target(arch: Arch) -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
+    // Note: If bumping this version, remember to update it in the rustc/platform-support docs.
     from_set_deployment_target("MACOSX_DEPLOYMENT_TARGET")
         .unwrap_or_else(|| macos_default_deployment_target(arch))
 }
@@ -320,6 +321,7 @@ fn link_env_remove(os: &'static str) -> StaticCow<[StaticCow<str>]> {
 
 fn ios_deployment_target(arch: Arch, abi: &str) -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
+    // Note: If bumping this version, remember to update it in the rustc/platform-support docs.
     let (major, minor) = match (arch, abi) {
         (Arm64e, _) => (14, 0),
         // Mac Catalyst defaults to 13.1 in Clang.
@@ -352,6 +354,7 @@ pub fn ios_sim_llvm_target(arch: Arch) -> String {
 
 fn tvos_deployment_target() -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
+    // Note: If bumping this version, remember to update it in the rustc platform-support docs.
     from_set_deployment_target("TVOS_DEPLOYMENT_TARGET").unwrap_or((10, 0))
 }
 
@@ -367,6 +370,7 @@ pub fn tvos_sim_llvm_target(arch: Arch) -> String {
 
 fn watchos_deployment_target() -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
+    // Note: If bumping this version, remember to update it in the rustc platform-support docs.
     from_set_deployment_target("WATCHOS_DEPLOYMENT_TARGET").unwrap_or((5, 0))
 }
 
@@ -382,6 +386,7 @@ pub fn watchos_sim_llvm_target(arch: Arch) -> String {
 
 fn visionos_deployment_target() -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
+    // Note: If bumping this version, remember to update it in the rustc platform-support docs.
     from_set_deployment_target("XROS_DEPLOYMENT_TARGET").unwrap_or((1, 0))
 }
 

library/alloc/Cargo.toml

@@ -37,4 +37,6 @@ compiler-builtins-no-asm = ["compiler_builtins/no-asm"]
 compiler-builtins-mangled-names = ["compiler_builtins/mangled-names"]
 compiler-builtins-weak-intrinsics = ["compiler_builtins/weak-intrinsics"]
 # Make panics and failed asserts immediately abort without formatting any message
-panic_immediate_abort = []
+panic_immediate_abort = ["core/panic_immediate_abort"]
+# Choose algorithms that are optimized for binary size instead of runtime performance
+optimize_for_size = ["core/optimize_for_size"]

library/core/Cargo.toml

@@ -31,6 +31,8 @@ rand_xorshift = { version = "0.3.0", default-features = false }
 [features]
 # Make panics and failed asserts immediately abort without formatting any message
 panic_immediate_abort = []
+# Choose algorithms that are optimized for binary size instead of runtime performance
+optimize_for_size = []
 # Make `RefCell` store additional debugging information, which is printed out when
 # a borrow error occurs
 debug_refcell = []

library/core/src/intrinsics/simd.rs

@@ -569,6 +569,13 @@ extern "rust-intrinsic" {
     #[rustc_nounwind]
     pub fn simd_ctlz<T>(x: T) -> T;
 
+    /// Count the number of ones in each element.
+    ///
+    /// `T` must be a vector of integers.
+    #[rustc_nounwind]
+    #[cfg(not(bootstrap))]
+    pub fn simd_ctpop<T>(x: T) -> T;
+
     /// Count the trailing zeros of each element.
     ///
     /// `T` must be a vector of integers.

library/std/Cargo.toml

@@ -78,6 +78,8 @@ system-llvm-libunwind = ["unwind/system-llvm-libunwind"]
 
 # Make panics and failed asserts immediately abort without formatting any message
 panic_immediate_abort = ["core/panic_immediate_abort", "alloc/panic_immediate_abort"]
+# Choose algorithms that are optimized for binary size instead of runtime performance
+optimize_for_size = ["core/optimize_for_size", "alloc/optimize_for_size"]
 
 # Enable std_detect default features for stdarch/crates/std_detect:
 # https://github.com/rust-lang/stdarch/blob/master/crates/std_detect/Cargo.toml