diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/abi.rs | 12 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/builder.rs | 84 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/consts.rs | 6 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs | 78 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/coverageinfo/llvm_cov.rs | 12 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs | 16 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs | 86 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/llvm/ffi.rs | 5 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/llvm_util.rs | 42 |
9 files changed, 73 insertions, 268 deletions
diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs index 009e7e2487b..043123fcab2 100644 --- a/compiler/rustc_codegen_llvm/src/abi.rs +++ b/compiler/rustc_codegen_llvm/src/abi.rs @@ -24,6 +24,7 @@ use crate::attributes::{self, llfn_attrs_from_instance}; use crate::builder::Builder; use crate::context::CodegenCx; use crate::llvm::{self, Attribute, AttributePlace}; +use crate::llvm_util; use crate::type_::Type; use crate::type_of::LayoutLlvmExt; use crate::value::Value; @@ -500,7 +501,16 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> { } } PassMode::Indirect { attrs, meta_attrs: None, on_stack: false } => { - apply(attrs); + let i = apply(attrs); + if cx.sess().opts.optimize != config::OptLevel::No + && llvm_util::get_version() >= (21, 0, 0) + { + attributes::apply_to_llfn( + llfn, + llvm::AttributePlace::Argument(i), + &[llvm::AttributeKind::DeadOnReturn.create_attr(cx.llcx)], + ); + } } PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack } => { assert!(!on_stack); diff --git a/compiler/rustc_codegen_llvm/src/builder.rs b/compiler/rustc_codegen_llvm/src/builder.rs index da2a153d819..917d07e3c61 100644 --- a/compiler/rustc_codegen_llvm/src/builder.rs +++ b/compiler/rustc_codegen_llvm/src/builder.rs @@ -557,13 +557,25 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let (size, signed) = ty.int_size_and_signed(self.tcx); let width = size.bits(); - if oop == OverflowOp::Sub && !signed { - // Emit sub and icmp instead of llvm.usub.with.overflow. LLVM considers these - // to be the canonical form. It will attempt to reform llvm.usub.with.overflow - // in the backend if profitable. - let sub = self.sub(lhs, rhs); - let cmp = self.icmp(IntPredicate::IntULT, lhs, rhs); - return (sub, cmp); + if !signed { + match oop { + OverflowOp::Sub => { + // Emit sub and icmp instead of llvm.usub.with.overflow. LLVM considers these + // to be the canonical form. It will attempt to reform llvm.usub.with.overflow + // in the backend if profitable. + let sub = self.sub(lhs, rhs); + let cmp = self.icmp(IntPredicate::IntULT, lhs, rhs); + return (sub, cmp); + } + OverflowOp::Add => { + // Like with sub above, using icmp is the preferred form. See + // <https://rust-lang.zulipchat.com/#narrow/channel/187780-t-compiler.2Fllvm/topic/.60uadd.2Ewith.2Eoverflow.60.20.28again.29/near/533041085> + let add = self.add(lhs, rhs); + let cmp = self.icmp(IntPredicate::IntULT, add, lhs); + return (add, cmp); + } + OverflowOp::Mul => {} + } } let oop_str = match oop { @@ -1327,15 +1339,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { &mut self, op: rustc_codegen_ssa::common::AtomicRmwBinOp, dst: &'ll Value, - mut src: &'ll Value, + src: &'ll Value, order: rustc_middle::ty::AtomicOrdering, + ret_ptr: bool, ) -> &'ll Value { - // The only RMW operation that LLVM supports on pointers is compare-exchange. - let requires_cast_to_int = self.val_ty(src) == self.type_ptr() - && op != rustc_codegen_ssa::common::AtomicRmwBinOp::AtomicXchg; - if requires_cast_to_int { - src = self.ptrtoint(src, self.type_isize()); - } + // FIXME: If `ret_ptr` is true and `src` is not a pointer, we *should* tell LLVM that the + // LHS is a pointer and the operation should be provenance-preserving, but LLVM does not + // currently support that (https://github.com/llvm/llvm-project/issues/120837). let mut res = unsafe { llvm::LLVMBuildAtomicRMW( self.llbuilder, @@ -1346,7 +1356,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { llvm::False, // SingleThreaded ) }; - if requires_cast_to_int { + if ret_ptr && self.val_ty(res) != self.type_ptr() { res = self.inttoptr(res, self.type_ptr()); } res @@ -1886,48 +1896,4 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> { ) { self.call_intrinsic("llvm.instrprof.increment", &[], &[fn_name, hash, num_counters, index]); } - - /// Emits a call to `llvm.instrprof.mcdc.parameters`. - /// - /// This doesn't produce any code directly, but is used as input by - /// the LLVM pass that handles coverage instrumentation. - /// - /// (See clang's [`CodeGenPGO::emitMCDCParameters`] for comparison.) - /// - /// [`CodeGenPGO::emitMCDCParameters`]: - /// https://github.com/rust-lang/llvm-project/blob/5399a24/clang/lib/CodeGen/CodeGenPGO.cpp#L1124 - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_parameters( - &mut self, - fn_name: &'ll Value, - hash: &'ll Value, - bitmap_bits: &'ll Value, - ) { - self.call_intrinsic("llvm.instrprof.mcdc.parameters", &[], &[fn_name, hash, bitmap_bits]); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_tvbitmap_update( - &mut self, - fn_name: &'ll Value, - hash: &'ll Value, - bitmap_index: &'ll Value, - mcdc_temp: &'ll Value, - ) { - let args = &[fn_name, hash, bitmap_index, mcdc_temp]; - self.call_intrinsic("llvm.instrprof.mcdc.tvbitmap.update", &[], args); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_condbitmap_reset(&mut self, mcdc_temp: &'ll Value) { - self.store(self.const_i32(0), mcdc_temp, self.tcx.data_layout.i32_align.abi); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_condbitmap_update(&mut self, cond_index: &'ll Value, mcdc_temp: &'ll Value) { - let align = self.tcx.data_layout.i32_align.abi; - let current_tv_index = self.load(self.cx.type_i32(), mcdc_temp, align); - let new_tv_index = self.add(current_tv_index, cond_index); - self.store(new_tv_index, mcdc_temp, align); - } } diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs index 0b96b63bc85..6b06daf3477 100644 --- a/compiler/rustc_codegen_llvm/src/consts.rs +++ b/compiler/rustc_codegen_llvm/src/consts.rs @@ -5,7 +5,7 @@ use rustc_codegen_ssa::common; use rustc_codegen_ssa::traits::*; use rustc_hir::LangItem; use rustc_hir::def::DefKind; -use rustc_hir::def_id::DefId; +use rustc_hir::def_id::{DefId, LOCAL_CRATE}; use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs}; use rustc_middle::mir::interpret::{ Allocation, ConstAllocation, ErrorHandled, InitChunk, Pointer, Scalar as InterpScalar, @@ -191,8 +191,8 @@ fn check_and_apply_linkage<'ll, 'tcx>( // linkage and there are no definitions), then // `extern_with_linkage_foo` will instead be initialized to // zero. - let mut real_name = "_rust_extern_with_linkage_".to_string(); - real_name.push_str(sym); + let real_name = + format!("_rust_extern_with_linkage_{:016x}_{sym}", cx.tcx.stable_crate_id(LOCAL_CRATE)); let g2 = cx.define_global(&real_name, llty).unwrap_or_else(|| { cx.sess().dcx().emit_fatal(SymbolAlreadyDefined { span: cx.tcx.def_span(def_id), diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs index f6000e72840..a4b60d420f3 100644 --- a/compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs +++ b/compiler/rustc_codegen_llvm/src/coverageinfo/ffi.rs @@ -73,48 +73,6 @@ pub(crate) struct CounterExpression { pub(crate) rhs: Counter, } -pub(crate) mod mcdc { - use rustc_middle::mir::coverage::{ConditionId, ConditionInfo, DecisionInfo}; - - /// Must match the layout of `LLVMRustMCDCDecisionParameters`. - #[repr(C)] - #[derive(Clone, Copy, Debug, Default)] - pub(crate) struct DecisionParameters { - bitmap_idx: u32, - num_conditions: u16, - } - - type LLVMConditionId = i16; - - /// Must match the layout of `LLVMRustMCDCBranchParameters`. - #[repr(C)] - #[derive(Clone, Copy, Debug, Default)] - pub(crate) struct BranchParameters { - condition_id: LLVMConditionId, - condition_ids: [LLVMConditionId; 2], - } - - impl From<ConditionInfo> for BranchParameters { - fn from(value: ConditionInfo) -> Self { - let to_llvm_cond_id = |cond_id: Option<ConditionId>| { - cond_id.and_then(|id| LLVMConditionId::try_from(id.as_usize()).ok()).unwrap_or(-1) - }; - let ConditionInfo { condition_id, true_next_id, false_next_id } = value; - Self { - condition_id: to_llvm_cond_id(Some(condition_id)), - condition_ids: [to_llvm_cond_id(false_next_id), to_llvm_cond_id(true_next_id)], - } - } - } - - impl From<DecisionInfo> for DecisionParameters { - fn from(info: DecisionInfo) -> Self { - let DecisionInfo { bitmap_idx, num_conditions } = info; - Self { bitmap_idx, num_conditions } - } - } -} - /// A span of source code coordinates to be embedded in coverage metadata. /// /// Must match the layout of `LLVMRustCoverageSpan`. @@ -148,26 +106,14 @@ pub(crate) struct Regions { pub(crate) code_regions: Vec<CodeRegion>, pub(crate) expansion_regions: Vec<ExpansionRegion>, pub(crate) branch_regions: Vec<BranchRegion>, - pub(crate) mcdc_branch_regions: Vec<MCDCBranchRegion>, - pub(crate) mcdc_decision_regions: Vec<MCDCDecisionRegion>, } impl Regions { /// Returns true if none of this structure's tables contain any regions. pub(crate) fn has_no_regions(&self) -> bool { - let Self { - code_regions, - expansion_regions, - branch_regions, - mcdc_branch_regions, - mcdc_decision_regions, - } = self; - - code_regions.is_empty() - && expansion_regions.is_empty() - && branch_regions.is_empty() - && mcdc_branch_regions.is_empty() - && mcdc_decision_regions.is_empty() + let Self { code_regions, expansion_regions, branch_regions } = self; + + code_regions.is_empty() && expansion_regions.is_empty() && branch_regions.is_empty() } } @@ -195,21 +141,3 @@ pub(crate) struct BranchRegion { pub(crate) true_counter: Counter, pub(crate) false_counter: Counter, } - -/// Must match the layout of `LLVMRustCoverageMCDCBranchRegion`. -#[derive(Clone, Debug)] -#[repr(C)] -pub(crate) struct MCDCBranchRegion { - pub(crate) cov_span: CoverageSpan, - pub(crate) true_counter: Counter, - pub(crate) false_counter: Counter, - pub(crate) mcdc_branch_params: mcdc::BranchParameters, -} - -/// Must match the layout of `LLVMRustCoverageMCDCDecisionRegion`. -#[derive(Clone, Debug)] -#[repr(C)] -pub(crate) struct MCDCDecisionRegion { - pub(crate) cov_span: CoverageSpan, - pub(crate) mcdc_decision_params: mcdc::DecisionParameters, -} diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/llvm_cov.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/llvm_cov.rs index 907d6d41a1f..bc4f6bb6a82 100644 --- a/compiler/rustc_codegen_llvm/src/coverageinfo/llvm_cov.rs +++ b/compiler/rustc_codegen_llvm/src/coverageinfo/llvm_cov.rs @@ -63,13 +63,7 @@ pub(crate) fn write_function_mappings_to_buffer( expressions: &[ffi::CounterExpression], regions: &ffi::Regions, ) -> Vec<u8> { - let ffi::Regions { - code_regions, - expansion_regions, - branch_regions, - mcdc_branch_regions, - mcdc_decision_regions, - } = regions; + let ffi::Regions { code_regions, expansion_regions, branch_regions } = regions; // SAFETY: // - All types are FFI-compatible and have matching representations in Rust/C++. @@ -87,10 +81,6 @@ pub(crate) fn write_function_mappings_to_buffer( expansion_regions.len(), branch_regions.as_ptr(), branch_regions.len(), - mcdc_branch_regions.as_ptr(), - mcdc_branch_regions.len(), - mcdc_decision_regions.as_ptr(), - mcdc_decision_regions.len(), buffer, ) }) diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs index fd1e7f7f160..e0da8d36876 100644 --- a/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs +++ b/compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs @@ -140,8 +140,6 @@ fn fill_region_tables<'tcx>( code_regions, expansion_regions: _, // FIXME(Zalathar): Fill out support for expansion regions branch_regions, - mcdc_branch_regions, - mcdc_decision_regions, } = &mut covfun.regions; // For each counter/region pair in this function+file, convert it to a @@ -161,20 +159,6 @@ fn fill_region_tables<'tcx>( false_counter: counter_for_bcb(false_bcb), }); } - MappingKind::MCDCBranch { true_bcb, false_bcb, mcdc_params } => { - mcdc_branch_regions.push(ffi::MCDCBranchRegion { - cov_span, - true_counter: counter_for_bcb(true_bcb), - false_counter: counter_for_bcb(false_bcb), - mcdc_branch_params: ffi::mcdc::BranchParameters::from(mcdc_params), - }); - } - MappingKind::MCDCDecision(mcdc_decision_params) => { - mcdc_decision_regions.push(ffi::MCDCDecisionRegion { - cov_span, - mcdc_decision_params: ffi::mcdc::DecisionParameters::from(mcdc_decision_params), - }); - } } } } diff --git a/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs b/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs index 119237abd6b..6a58f495c9d 100644 --- a/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs +++ b/compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs @@ -1,11 +1,10 @@ use std::cell::{OnceCell, RefCell}; use std::ffi::{CStr, CString}; -use rustc_abi::Size; use rustc_codegen_ssa::traits::{ - BuilderMethods, ConstCodegenMethods, CoverageInfoBuilderMethods, MiscCodegenMethods, + ConstCodegenMethods, CoverageInfoBuilderMethods, MiscCodegenMethods, }; -use rustc_data_structures::fx::{FxHashMap, FxIndexMap}; +use rustc_data_structures::fx::FxIndexMap; use rustc_middle::mir::coverage::CoverageKind; use rustc_middle::ty::Instance; use tracing::{debug, instrument}; @@ -28,34 +27,13 @@ pub(crate) struct CguCoverageContext<'ll, 'tcx> { /// symbol name, and `llvm-cov` will exit fatally if it can't resolve that /// hash back to an entry in the binary's `__llvm_prf_names` linker section. pub(crate) pgo_func_name_var_map: RefCell<FxIndexMap<Instance<'tcx>, &'ll llvm::Value>>, - pub(crate) mcdc_condition_bitmap_map: RefCell<FxHashMap<Instance<'tcx>, Vec<&'ll llvm::Value>>>, covfun_section_name: OnceCell<CString>, } impl<'ll, 'tcx> CguCoverageContext<'ll, 'tcx> { pub(crate) fn new() -> Self { - Self { - pgo_func_name_var_map: Default::default(), - mcdc_condition_bitmap_map: Default::default(), - covfun_section_name: Default::default(), - } - } - - /// LLVM use a temp value to record evaluated mcdc test vector of each decision, which is - /// called condition bitmap. In order to handle nested decisions, several condition bitmaps can - /// be allocated for a function body. These values are named `mcdc.addr.{i}` and are a 32-bit - /// integers. They respectively hold the condition bitmaps for decisions with a depth of `i`. - fn try_get_mcdc_condition_bitmap( - &self, - instance: &Instance<'tcx>, - decision_depth: u16, - ) -> Option<&'ll llvm::Value> { - self.mcdc_condition_bitmap_map - .borrow() - .get(instance) - .and_then(|bitmap_map| bitmap_map.get(decision_depth as usize)) - .copied() // Dereference Option<&&Value> to Option<&Value> + Self { pgo_func_name_var_map: Default::default(), covfun_section_name: Default::default() } } /// Returns the list of instances considered "used" in this CGU, as @@ -105,38 +83,6 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> { } impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> { - fn init_coverage(&mut self, instance: Instance<'tcx>) { - let Some(function_coverage_info) = - self.tcx.instance_mir(instance.def).function_coverage_info.as_deref() - else { - return; - }; - - // If there are no MC/DC bitmaps to set up, return immediately. - if function_coverage_info.mcdc_bitmap_bits == 0 { - return; - } - - let fn_name = self.ensure_pgo_func_name_var(instance); - let hash = self.const_u64(function_coverage_info.function_source_hash); - let bitmap_bits = self.const_u32(function_coverage_info.mcdc_bitmap_bits as u32); - self.mcdc_parameters(fn_name, hash, bitmap_bits); - - // Create pointers named `mcdc.addr.{i}` to stack-allocated condition bitmaps. - let mut cond_bitmaps = vec![]; - for i in 0..function_coverage_info.mcdc_num_condition_bitmaps { - // MC/DC intrinsics will perform loads/stores that use the ABI default - // alignment for i32, so our variable declaration should match. - let align = self.tcx.data_layout.i32_align.abi; - let cond_bitmap = self.alloca(Size::from_bytes(4), align); - llvm::set_value_name(cond_bitmap, format!("mcdc.addr.{i}").as_bytes()); - self.store(self.const_i32(0), cond_bitmap, align); - cond_bitmaps.push(cond_bitmap); - } - - self.coverage_cx().mcdc_condition_bitmap_map.borrow_mut().insert(instance, cond_bitmaps); - } - #[instrument(level = "debug", skip(self))] fn add_coverage(&mut self, instance: Instance<'tcx>, kind: &CoverageKind) { // Our caller should have already taken care of inlining subtleties, @@ -153,7 +99,7 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> { // When that happens, we currently just discard those statements, so // the corresponding code will be undercounted. // FIXME(Zalathar): Find a better solution for mixed-coverage builds. - let Some(coverage_cx) = &bx.cx.coverage_cx else { return }; + let Some(_coverage_cx) = &bx.cx.coverage_cx else { return }; let Some(function_coverage_info) = bx.tcx.instance_mir(instance.def).function_coverage_info.as_deref() @@ -185,30 +131,6 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> { } // If a BCB doesn't have an associated physical counter, there's nothing to codegen. CoverageKind::VirtualCounter { .. } => {} - CoverageKind::CondBitmapUpdate { index, decision_depth } => { - let cond_bitmap = coverage_cx - .try_get_mcdc_condition_bitmap(&instance, decision_depth) - .expect("mcdc cond bitmap should have been allocated for updating"); - let cond_index = bx.const_i32(index as i32); - bx.mcdc_condbitmap_update(cond_index, cond_bitmap); - } - CoverageKind::TestVectorBitmapUpdate { bitmap_idx, decision_depth } => { - let cond_bitmap = - coverage_cx.try_get_mcdc_condition_bitmap(&instance, decision_depth).expect( - "mcdc cond bitmap should have been allocated for merging \ - into the global bitmap", - ); - assert!( - bitmap_idx as usize <= function_coverage_info.mcdc_bitmap_bits, - "bitmap index of the decision out of range" - ); - - let fn_name = bx.ensure_pgo_func_name_var(instance); - let hash = bx.const_u64(function_coverage_info.function_source_hash); - let bitmap_index = bx.const_u32(bitmap_idx); - bx.mcdc_tvbitmap_update(fn_name, hash, bitmap_index, cond_bitmap); - bx.mcdc_condbitmap_reset(cond_bitmap); - } } } } diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs index 2443194ff48..ad3c3d5932e 100644 --- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs +++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs @@ -249,6 +249,7 @@ pub(crate) enum AttributeKind { FnRetThunkExtern = 41, Writable = 42, DeadOnUnwind = 43, + DeadOnReturn = 44, } /// LLVMIntPredicate @@ -2056,10 +2057,6 @@ unsafe extern "C" { NumExpansionRegions: size_t, BranchRegions: *const crate::coverageinfo::ffi::BranchRegion, NumBranchRegions: size_t, - MCDCBranchRegions: *const crate::coverageinfo::ffi::MCDCBranchRegion, - NumMCDCBranchRegions: size_t, - MCDCDecisionRegions: *const crate::coverageinfo::ffi::MCDCDecisionRegion, - NumMCDCDecisionRegions: size_t, BufferOut: &RustString, ); diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs index 53899da183a..28d2100f478 100644 --- a/compiler/rustc_codegen_llvm/src/llvm_util.rs +++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs @@ -262,6 +262,15 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea // Filter out features that are not supported by the current LLVM version ("aarch64", "fpmr") => None, // only existed in 18 ("arm", "fp16") => Some(LLVMFeature::new("fullfp16")), + // NVPTX targets added in LLVM 20 + ("nvptx64", "sm_100") if get_version().0 < 20 => None, + ("nvptx64", "sm_100a") if get_version().0 < 20 => None, + ("nvptx64", "sm_101") if get_version().0 < 20 => None, + ("nvptx64", "sm_101a") if get_version().0 < 20 => None, + ("nvptx64", "sm_120") if get_version().0 < 20 => None, + ("nvptx64", "sm_120a") if get_version().0 < 20 => None, + ("nvptx64", "ptx86") if get_version().0 < 20 => None, + ("nvptx64", "ptx87") if get_version().0 < 20 => None, // Filter out features that are not supported by the current LLVM version ("loongarch64", "div32" | "lam-bh" | "lamcas" | "ld-seq-sa" | "scq") if get_version().0 < 20 => @@ -324,15 +333,12 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea /// /// We do not have to worry about RUSTC_SPECIFIC_FEATURES here, those are handled outside codegen. pub(crate) fn target_config(sess: &Session) -> TargetConfig { - // Add base features for the target. - // We do *not* add the -Ctarget-features there, and instead duplicate the logic for that below. - // The reason is that if LLVM considers a feature implied but we do not, we don't want that to - // show up in `cfg`. That way, `cfg` is entirely under our control -- except for the handling of - // the target CPU, that is still expanded to target features (with all their implied features) - // by LLVM. let target_machine = create_informational_target_machine(sess, true); let (unstable_target_features, target_features) = cfg_target_feature(sess, |feature| { + // This closure determines whether the target CPU has the feature according to LLVM. We do + // *not* consider the `-Ctarget-feature`s here, as that will be handled later in + // `cfg_target_feature`. if let Some(feat) = to_llvm_features(sess, feature) { // All the LLVM features this expands to must be enabled. for llvm_feature in feat { @@ -371,24 +377,25 @@ fn update_target_reliable_float_cfg(sess: &Session, cfg: &mut TargetConfig) { let target_abi = sess.target.options.abi.as_ref(); let target_pointer_width = sess.target.pointer_width; let version = get_version(); + let lt_20_1_1 = version < (20, 1, 1); + let lt_21_0_0 = version < (21, 0, 0); cfg.has_reliable_f16 = match (target_arch, target_os) { - // Selection failure <https://github.com/llvm/llvm-project/issues/50374> - ("s390x", _) => false, - // LLVM crash without neon <https://github.com/llvm/llvm-project/issues/129394> (now fixed) + // LLVM crash without neon <https://github.com/llvm/llvm-project/issues/129394> (fixed in llvm20) ("aarch64", _) - if !cfg.target_features.iter().any(|f| f.as_str() == "neon") - && version < (20, 1, 1) => + if !cfg.target_features.iter().any(|f| f.as_str() == "neon") && lt_20_1_1 => { false } // Unsupported <https://github.com/llvm/llvm-project/issues/94434> ("arm64ec", _) => false, + // Selection failure <https://github.com/llvm/llvm-project/issues/50374> (fixed in llvm21) + ("s390x", _) if lt_21_0_0 => false, // MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054> ("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false, // Infinite recursion <https://github.com/llvm/llvm-project/issues/97981> ("csky", _) => false, - ("hexagon", _) => false, + ("hexagon", _) if lt_21_0_0 => false, // (fixed in llvm21) ("powerpc" | "powerpc64", _) => false, ("sparc" | "sparc64", _) => false, ("wasm32" | "wasm64", _) => false, @@ -401,9 +408,10 @@ fn update_target_reliable_float_cfg(sess: &Session, cfg: &mut TargetConfig) { cfg.has_reliable_f128 = match (target_arch, target_os) { // Unsupported <https://github.com/llvm/llvm-project/issues/94434> ("arm64ec", _) => false, - // Selection bug <https://github.com/llvm/llvm-project/issues/96432> - ("mips64" | "mips64r6", _) => false, - // Selection bug <https://github.com/llvm/llvm-project/issues/95471> + // Selection bug <https://github.com/llvm/llvm-project/issues/96432> (fixed in llvm20) + ("mips64" | "mips64r6", _) if lt_20_1_1 => false, + // Selection bug <https://github.com/llvm/llvm-project/issues/95471>. This issue is closed + // but basic math still does not work. ("nvptx64", _) => false, // Unsupported https://github.com/llvm/llvm-project/issues/121122 ("amdgpu", _) => false, @@ -413,8 +421,8 @@ fn update_target_reliable_float_cfg(sess: &Session, cfg: &mut TargetConfig) { // ABI unsupported <https://github.com/llvm/llvm-project/issues/41838> ("sparc", _) => false, // Stack alignment bug <https://github.com/llvm/llvm-project/issues/77401>. NB: tests may - // not fail if our compiler-builtins is linked. - ("x86", _) => false, + // not fail if our compiler-builtins is linked. (fixed in llvm21) + ("x86", _) if lt_21_0_0 => false, // MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054> ("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false, // There are no known problems on other platforms, so the only requirement is that symbols |