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This repository was archived by the owner on May 28, 2025. It is now read-only.
/rustPublic archive
forked fromrust-lang/rust

Commitbd15dd1

Browse files
committed
Auto merge ofrust-lang#140424 - tgross35:float-experiments, r=<try>
[experiment] reliable float experimentsTrying a few blocked things based on top ofrust-lang#140323.r? `@ghost`try-job: x86_64-gnu-llvm-19-1try-job: x86_64-gnu-llvm-20-1
2 parents25cdf1f +e56745d commitbd15dd1

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‎compiler/rustc_codegen_cranelift/src/lib.rs‎

Lines changed: 12 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -41,8 +41,8 @@ use std::sync::Arc;
4141

4242
use cranelift_codegen::isa::TargetIsa;
4343
use cranelift_codegen::settings::{self,Configurable};
44-
use rustc_codegen_ssa::CodegenResults;
4544
use rustc_codegen_ssa::traits::CodegenBackend;
45+
use rustc_codegen_ssa::{CodegenResults,TargetConfig};
4646
use rustc_metadata::EncodedMetadata;
4747
use rustc_middle::dep_graph::{WorkProduct,WorkProductId};
4848
use rustc_session::Session;
@@ -178,7 +178,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
178178
}
179179
}
180180

181-
fntarget_features_cfg(&self,sess:&Session) ->(Vec<Symbol>,Vec<Symbol>){
181+
fntarget_config(&self,sess:&Session) ->TargetConfig{
182182
// FIXME return the actually used target features. this is necessary for #[cfg(target_feature)]
183183
let target_features =if sess.target.arch =="x86_64" && sess.target.os !="none"{
184184
// x86_64 mandates SSE2 support and rustc requires the x87 feature to be enabled
@@ -197,7 +197,16 @@ impl CodegenBackend for CraneliftCodegenBackend {
197197
};
198198
// FIXME do `unstable_target_features` properly
199199
let unstable_target_features = target_features.clone();
200-
(target_features, unstable_target_features)
200+
201+
TargetConfig{
202+
target_features,
203+
unstable_target_features,
204+
// Cranelift does not yet support f16 or f128
205+
has_reliable_f16:false,
206+
has_reliable_f16_math:false,
207+
has_reliable_f128:false,
208+
has_reliable_f128_math:false,
209+
}
201210
}
202211

203212
fnprint_version(&self){

‎compiler/rustc_codegen_gcc/src/gcc_util.rs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -55,7 +55,7 @@ pub(crate) fn global_gcc_features(sess: &Session, diagnostics: bool) -> Vec<Stri
5555
)
5656
}elseifletSome(feature) = feature.strip_prefix('-'){
5757
// FIXME: Why do we not remove implied features on "-" here?
58-
// We do the equivalent above in `target_features_cfg`.
58+
// We do the equivalent above in `target_config`.
5959
// See <https://github.com/rust-lang/rust/issues/134792>.
6060
all_rust_features.push((false, feature));
6161
}elseif !feature.is_empty() && diagnostics{

‎compiler/rustc_codegen_gcc/src/lib.rs‎

Lines changed: 14 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -102,7 +102,7 @@ use rustc_codegen_ssa::back::write::{
102102
};
103103
use rustc_codegen_ssa::base::codegen_crate;
104104
use rustc_codegen_ssa::traits::{CodegenBackend,ExtraBackendMethods,WriteBackendMethods};
105-
use rustc_codegen_ssa::{CodegenResults,CompiledModule,ModuleCodegen};
105+
use rustc_codegen_ssa::{CodegenResults,CompiledModule,ModuleCodegen,TargetConfig};
106106
use rustc_data_structures::fx::FxIndexMap;
107107
use rustc_data_structures::sync::IntoDynSyncSend;
108108
use rustc_errors::DiagCtxtHandle;
@@ -260,8 +260,8 @@ impl CodegenBackend for GccCodegenBackend {
260260
.join(sess)
261261
}
262262

263-
fntarget_features_cfg(&self,sess:&Session) ->(Vec<Symbol>,Vec<Symbol>){
264-
target_features_cfg(sess,&self.target_info)
263+
fntarget_config(&self,sess:&Session) ->TargetConfig{
264+
target_config(sess,&self.target_info)
265265
}
266266
}
267267

@@ -485,10 +485,7 @@ fn to_gcc_opt_level(optlevel: Option<OptLevel>) -> OptimizationLevel {
485485
}
486486

487487
/// Returns the features that should be set in `cfg(target_feature)`.
488-
fntarget_features_cfg(
489-
sess:&Session,
490-
target_info:&LockedTargetInfo,
491-
) ->(Vec<Symbol>,Vec<Symbol>){
488+
fntarget_config(sess:&Session,target_info:&LockedTargetInfo) ->TargetConfig{
492489
// TODO(antoyo): use global_gcc_features.
493490
let f = |allow_unstable|{
494491
sess.target
@@ -523,5 +520,14 @@ fn target_features_cfg(
523520

524521
let target_features =f(false);
525522
let unstable_target_features =f(true);
526-
(target_features, unstable_target_features)
523+
524+
TargetConfig{
525+
target_features,
526+
unstable_target_features,
527+
// There are no known bugs with GCC support for f16 or f128
528+
has_reliable_f16:true,
529+
has_reliable_f16_math:true,
530+
has_reliable_f128:true,
531+
has_reliable_f128_math:true,
532+
}
527533
}

‎compiler/rustc_codegen_llvm/src/lib.rs‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -29,15 +29,15 @@ use back::owned_target_machine::OwnedTargetMachine;
2929
use back::write::{create_informational_target_machine, create_target_machine};
3030
use context::SimpleCx;
3131
use errors::{AutoDiffWithoutLTO,ParseTargetMachineConfig};
32-
use llvm_util::target_features_cfg;
32+
use llvm_util::target_config;
3333
use rustc_ast::expand::allocator::AllocatorKind;
3434
use rustc_ast::expand::autodiff_attrs::AutoDiffItem;
3535
use rustc_codegen_ssa::back::lto::{LtoModuleCodegen,SerializedModule,ThinModule};
3636
use rustc_codegen_ssa::back::write::{
3737
CodegenContext,FatLtoInput,ModuleConfig,TargetMachineFactoryConfig,TargetMachineFactoryFn,
3838
};
3939
use rustc_codegen_ssa::traits::*;
40-
use rustc_codegen_ssa::{CodegenResults,CompiledModule,ModuleCodegen};
40+
use rustc_codegen_ssa::{CodegenResults,CompiledModule,ModuleCodegen,TargetConfig};
4141
use rustc_data_structures::fx::FxIndexMap;
4242
use rustc_errors::{DiagCtxtHandle,FatalError};
4343
use rustc_metadata::EncodedMetadata;
@@ -338,8 +338,8 @@ impl CodegenBackend for LlvmCodegenBackend {
338338
llvm_util::print_version();
339339
}
340340

341-
fntarget_features_cfg(&self,sess:&Session) ->(Vec<Symbol>,Vec<Symbol>){
342-
target_features_cfg(sess)
341+
fntarget_config(&self,sess:&Session) ->TargetConfig{
342+
target_config(sess)
343343
}
344344

345345
fncodegen_crate<'tcx>(

‎compiler/rustc_codegen_llvm/src/llvm_util.rs‎

Lines changed: 82 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -6,6 +6,7 @@ use std::sync::Once;
66
use std::{ptr, slice, str};
77

88
use libc::c_int;
9+
use rustc_codegen_ssa::TargetConfig;
910
use rustc_codegen_ssa::base::wants_wasm_eh;
1011
use rustc_codegen_ssa::codegen_attrs::check_tied_features;
1112
use rustc_data_structures::fx::{FxHashMap,FxHashSet};
@@ -302,7 +303,7 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea
302303
/// Must express features in the way Rust understands them.
303304
///
304305
/// We do not have to worry about RUSTC_SPECIFIC_FEATURES here, those are handled outside codegen.
305-
pub(crate)fntarget_features_cfg(sess:&Session) ->(Vec<Symbol>,Vec<Symbol>){
306+
pub(crate)fntarget_config(sess:&Session) ->TargetConfig{
306307
// Add base features for the target.
307308
// We do *not* add the -Ctarget-features there, and instead duplicate the logic for that below.
308309
// The reason is that if LLVM considers a feature implied but we do not, we don't want that to
@@ -402,7 +403,85 @@ pub(crate) fn target_features_cfg(sess: &Session) -> (Vec<Symbol>, Vec<Symbol>)
402403

403404
let target_features =f(false);
404405
let unstable_target_features =f(true);
405-
(target_features, unstable_target_features)
406+
letmut cfg =TargetConfig{
407+
target_features,
408+
unstable_target_features,
409+
has_reliable_f16:true,
410+
has_reliable_f16_math:true,
411+
has_reliable_f128:true,
412+
has_reliable_f128_math:true,
413+
};
414+
415+
update_target_reliable_float_cfg(sess,&mut cfg);
416+
cfg
417+
}
418+
419+
/// Determine whether or not experimental float types are reliable based on known bugs.
420+
fnupdate_target_reliable_float_cfg(sess:&Session,cfg:&mutTargetConfig){
421+
let target_arch = sess.target.arch.as_ref();
422+
let target_os = sess.target.options.os.as_ref();
423+
let target_env = sess.target.options.env.as_ref();
424+
let target_abi = sess.target.options.abi.as_ref();
425+
let target_pointer_width = sess.target.pointer_width;
426+
427+
cfg.has_reliable_f16 =match(target_arch, target_os){
428+
// Selection failure <https://github.com/llvm/llvm-project/issues/50374>
429+
("s390x", _) =>false,
430+
// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
431+
("arm64ec", _) =>false,
432+
// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
433+
("x86_64","windows")if target_env =="gnu" && target_abi !="llvm" =>false,
434+
// Infinite recursion <https://github.com/llvm/llvm-project/issues/97981>
435+
("csky", _) =>false,
436+
("hexagon", _) =>false,
437+
("powerpc" |"powerpc64", _) =>false,
438+
("sparc" |"sparc64", _) =>false,
439+
("wasm32" |"wasm64", _) =>false,
440+
// `f16` support only requires that symbols converting to and from `f32` are available. We
441+
// provide these in `compiler-builtins`, so `f16` should be available on all platforms that
442+
// do not have other ABI issues or LLVM crashes.
443+
_ =>true,
444+
};
445+
446+
cfg.has_reliable_f128 =match(target_arch, target_os){
447+
// Unsupported <https://github.com/llvm/llvm-project/issues/94434>
448+
("arm64ec", _) =>false,
449+
// Selection bug <https://github.com/llvm/llvm-project/issues/96432>
450+
("mips64" |"mips64r6", _) =>false,
451+
// Selection bug <https://github.com/llvm/llvm-project/issues/95471>
452+
("nvptx64", _) =>false,
453+
// ABI bugs <https://github.com/rust-lang/rust/issues/125109> et al. (full
454+
// list at <https://github.com/rust-lang/rust/issues/116909>)
455+
("powerpc" |"powerpc64", _) =>false,
456+
// ABI unsupported <https://github.com/llvm/llvm-project/issues/41838>
457+
("sparc", _) =>false,
458+
// Stack alignment bug <https://github.com/llvm/llvm-project/issues/77401>. NB: tests may
459+
// not fail if our compiler-builtins is linked.
460+
("x86", _) =>false,
461+
// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
462+
("x86_64","windows")if target_env =="gnu" && target_abi !="llvm" =>false,
463+
// There are no known problems on other platforms, so the only requirement is that symbols
464+
// are available. `compiler-builtins` provides all symbols required for core `f128`
465+
// support, so this should work for everything else.
466+
_ =>true,
467+
};
468+
469+
// Assume that working `f16` means working `f16` math for most platforms, since
470+
// operations just go through `f32`.
471+
cfg.has_reliable_f16_math = cfg.has_reliable_f16;
472+
473+
cfg.has_reliable_f128_math =match(target_arch, target_os){
474+
// LLVM lowers `fp128` math to `long double` symbols even on platforms where
475+
// `long double` is not IEEE binary128. See
476+
// <https://github.com/llvm/llvm-project/issues/44744>.
477+
//
478+
// This rules out anything that doesn't have `long double` = `binary128`; <= 32 bits
479+
// (ld is `f64`), anything other than Linux (Windows and MacOS use `f64`), and `x86`
480+
// (ld is 80-bit extended precision).
481+
("x86_64", _) =>false,
482+
(_,"linux")if target_pointer_width ==64 =>true,
483+
_ =>false,
484+
} && cfg.has_reliable_f128;
406485
}
407486

408487
pub(crate)fnprint_version(){
@@ -686,7 +765,7 @@ pub(crate) fn global_llvm_features(
686765
)
687766
}elseifletSome(feature) = feature.strip_prefix('-'){
688767
// FIXME: Why do we not remove implied features on "-" here?
689-
// We do the equivalent above in `target_features_cfg`.
768+
// We do the equivalent above in `target_config`.
690769
// See <https://github.com/rust-lang/rust/issues/134792>.
691770
all_rust_features.push((false, feature));
692771
}elseif !feature.is_empty(){

‎compiler/rustc_codegen_ssa/src/lib.rs‎

Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -235,6 +235,24 @@ pub struct CrateInfo {
235235
publint_levels:CodegenLintLevels,
236236
}
237237

238+
/// Target-specific options that get set in `cfg(...)`.
239+
///
240+
/// RUSTC_SPECIFIC_FEATURES should be skipped here, those are handled outside codegen.
241+
pubstructTargetConfig{
242+
/// Options to be set in `cfg(target_features)`.
243+
pubtarget_features:Vec<Symbol>,
244+
/// Options to be set in `cfg(target_features)`, but including unstable features.
245+
pubunstable_target_features:Vec<Symbol>,
246+
/// Option for `cfg(target_has_reliable_f16)`, true if `f16` basic arithmetic works.
247+
pubhas_reliable_f16:bool,
248+
/// Option for `cfg(target_has_reliable_f16_math)`, true if `f16` math calls work.
249+
pubhas_reliable_f16_math:bool,
250+
/// Option for `cfg(target_has_reliable_f128)`, true if `f128` basic arithmetic works.
251+
pubhas_reliable_f128:bool,
252+
/// Option for `cfg(target_has_reliable_f128_math)`, true if `f128` math calls work.
253+
pubhas_reliable_f128_math:bool,
254+
}
255+
238256
#[derive(Encodable,Decodable)]
239257
pubstructCodegenResults{
240258
pubmodules:Vec<CompiledModule>,

‎compiler/rustc_codegen_ssa/src/traits/backend.rs‎

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@ use super::write::WriteBackendMethods;
1818
usecrate::back::archive::ArArchiveBuilderBuilder;
1919
usecrate::back::link::link_binary;
2020
usecrate::back::write::TargetMachineFactoryFn;
21-
usecrate::{CodegenResults,ModuleCodegen};
21+
usecrate::{CodegenResults,ModuleCodegen,TargetConfig};
2222

2323
pubtraitBackendTypes{
2424
typeValue:CodegenObject;
@@ -50,8 +50,15 @@ pub trait CodegenBackend {
5050
/// - The second is like the first, but also includes unstable features.
5151
///
5252
/// RUSTC_SPECIFIC_FEATURES should be skipped here, those are handled outside codegen.
53-
fntarget_features_cfg(&self,_sess:&Session) ->(Vec<Symbol>,Vec<Symbol>){
54-
(vec![],vec![])
53+
fntarget_config(&self,_sess:&Session) ->TargetConfig{
54+
TargetConfig{
55+
target_features:vec![],
56+
unstable_target_features:vec![],
57+
has_reliable_f16:true,
58+
has_reliable_f16_math:true,
59+
has_reliable_f128:true,
60+
has_reliable_f128_math:true,
61+
}
5562
}
5663

5764
fnprint_passes(&self){}

‎compiler/rustc_feature/src/builtin_attrs.rs‎

Lines changed: 20 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -40,6 +40,26 @@ const GATED_CFGS: &[GatedCfg] = &[
4040
// this is consistent with naming of the compiler flag it's for
4141
(sym::fmt_debug, sym::fmt_debug,Features::fmt_debug),
4242
(sym::emscripten_wasm_eh, sym::cfg_emscripten_wasm_eh,Features::cfg_emscripten_wasm_eh),
43+
(
44+
sym::target_has_reliable_f16,
45+
sym::cfg_target_has_reliable_f16_f128,
46+
Features::cfg_target_has_reliable_f16_f128,
47+
),
48+
(
49+
sym::target_has_reliable_f16_math,
50+
sym::cfg_target_has_reliable_f16_f128,
51+
Features::cfg_target_has_reliable_f16_f128,
52+
),
53+
(
54+
sym::target_has_reliable_f128,
55+
sym::cfg_target_has_reliable_f16_f128,
56+
Features::cfg_target_has_reliable_f16_f128,
57+
),
58+
(
59+
sym::target_has_reliable_f128_math,
60+
sym::cfg_target_has_reliable_f16_f128,
61+
Features::cfg_target_has_reliable_f16_f128,
62+
),
4363
];
4464

4565
/// Find a gated cfg determined by the `pred`icate which is given the cfg's name.

‎compiler/rustc_feature/src/unstable.rs‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -205,6 +205,8 @@ declare_features! (
205205
(unstable, anonymous_lifetime_in_impl_trait,"1.63.0",None),
206206
/// Allows access to the emscripten_wasm_eh config, used by panic_unwind and unwind
207207
(internal, cfg_emscripten_wasm_eh,"1.86.0",None),
208+
/// Allows checking whether or not the backend correctly supports unstable float types.
209+
(internal, cfg_target_has_reliable_f16_f128,"CURRENT_RUSTC_VERSION",None),
208210
/// Allows identifying the `compiler_builtins` crate.
209211
(internal, compiler_builtins,"1.13.0",None),
210212
/// Allows writing custom MIR

‎compiler/rustc_interface/src/util.rs‎

Lines changed: 16 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -38,14 +38,25 @@ pub(crate) fn add_configuration(
3838
codegen_backend:&dynCodegenBackend,
3939
){
4040
let tf = sym::target_feature;
41+
let tf_cfg = codegen_backend.target_config(sess);
4142

42-
let(target_features, unstable_target_features) = codegen_backend.target_features_cfg(sess);
43+
sess.unstable_target_features.extend(tf_cfg.unstable_target_features.iter().copied());
44+
sess.target_features.extend(tf_cfg.target_features.iter().copied());
4345

44-
sess.unstable_target_features.extend(unstable_target_features.iter().copied());
46+
cfg.extend(tf_cfg.target_features.into_iter().map(|feat|(tf,Some(feat))));
4547

46-
sess.target_features.extend(target_features.iter().copied());
47-
48-
cfg.extend(target_features.into_iter().map(|feat|(tf,Some(feat))));
48+
if tf_cfg.has_reliable_f16{
49+
cfg.insert((sym::target_has_reliable_f16,None));
50+
}
51+
if tf_cfg.has_reliable_f16_math{
52+
cfg.insert((sym::target_has_reliable_f16_math,None));
53+
}
54+
if tf_cfg.has_reliable_f128{
55+
cfg.insert((sym::target_has_reliable_f128,None));
56+
}
57+
if tf_cfg.has_reliable_f128_math{
58+
cfg.insert((sym::target_has_reliable_f128_math,None));
59+
}
4960

5061
if sess.crt_static(None){
5162
cfg.insert((tf,Some(sym::crt_dash_static)));

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