Auto merge of #126518 - matthiaskrgr:rollup-wb70rzq, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - #125829 (rustc_span: Add conveniences for working with span formats)
 - #126361 (Unify intrinsics body handling in StableMIR)
 - #126417 (Add `f16` and `f128` inline ASM support for `x86` and `x86-64`)
 - #126424 ( Also sort `crt-static` in `--print target-features` output)
 - #126428 (Polish `std::path::absolute` documentation.)
 - #126429 (Add `f16` and `f128` const eval for binary and unary operationations)
 - #126448 (End support for Python 3.8 in tidy)
 - #126488 (Use `std::path::absolute` in bootstrap)
 - #126511 (.mailmap: Associate both my work and my private email with me)

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

.mailmap

@@ -379,6 +379,7 @@ Markus Westerlind <marwes91@gmail.com> Markus <marwes91@gmail.com>
 Martin Carton <cartonmartin+git@gmail.com>
 Martin Habovštiak <martin.habovstiak@gmail.com>
 Martin Hafskjold Thoresen <martinhath@gmail.com>
+Martin Nordholts <martin.nordholts@codetale.se> <enselic@gmail.com>
 Matej Lach <matej.lach@gmail.com> Matej Ľach <matej.lach@gmail.com>
 Mateusz Mikuła <mati865@gmail.com>
 Mateusz Mikuła <mati865@gmail.com> <mati865@users.noreply.github.com>

compiler/rustc_codegen_llvm/src/asm.rs

@@ -959,6 +959,43 @@ fn llvm_fixup_input<'ll, 'tcx>(
             InlineAsmRegClass::X86(X86InlineAsmRegClass::xmm_reg | X86InlineAsmRegClass::zmm_reg),
             Abi::Vector { .. },
         ) if layout.size.bytes() == 64 => bx.bitcast(value, bx.cx.type_vector(bx.cx.type_f64(), 8)),
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if bx.sess().asm_arch == Some(InlineAsmArch::X86)
+            && s.primitive() == Primitive::Float(Float::F128) =>
+        {
+            bx.bitcast(value, bx.type_vector(bx.type_i32(), 4))
+        }
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if s.primitive() == Primitive::Float(Float::F16) => {
+            let value = bx.insert_element(
+                bx.const_undef(bx.type_vector(bx.type_f16(), 8)),
+                value,
+                bx.const_usize(0),
+            );
+            bx.bitcast(value, bx.type_vector(bx.type_i16(), 8))
+        }
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Vector { element, count: count @ (8 | 16) },
+        ) if element.primitive() == Primitive::Float(Float::F16) => {
+            bx.bitcast(value, bx.type_vector(bx.type_i16(), count))
+        }
         (
             InlineAsmRegClass::Arm(ArmInlineAsmRegClass::sreg | ArmInlineAsmRegClass::sreg_low16),
             Abi::Scalar(s),
@@ -1036,6 +1073,39 @@ fn llvm_fixup_output<'ll, 'tcx>(
             InlineAsmRegClass::X86(X86InlineAsmRegClass::xmm_reg | X86InlineAsmRegClass::zmm_reg),
             Abi::Vector { .. },
         ) if layout.size.bytes() == 64 => bx.bitcast(value, layout.llvm_type(bx.cx)),
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if bx.sess().asm_arch == Some(InlineAsmArch::X86)
+            && s.primitive() == Primitive::Float(Float::F128) =>
+        {
+            bx.bitcast(value, bx.type_f128())
+        }
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if s.primitive() == Primitive::Float(Float::F16) => {
+            let value = bx.bitcast(value, bx.type_vector(bx.type_f16(), 8));
+            bx.extract_element(value, bx.const_usize(0))
+        }
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Vector { element, count: count @ (8 | 16) },
+        ) if element.primitive() == Primitive::Float(Float::F16) => {
+            bx.bitcast(value, bx.type_vector(bx.type_f16(), count))
+        }
         (
             InlineAsmRegClass::Arm(ArmInlineAsmRegClass::sreg | ArmInlineAsmRegClass::sreg_low16),
             Abi::Scalar(s),
@@ -1109,6 +1179,36 @@ fn llvm_fixup_output_type<'ll, 'tcx>(
             InlineAsmRegClass::X86(X86InlineAsmRegClass::xmm_reg | X86InlineAsmRegClass::zmm_reg),
             Abi::Vector { .. },
         ) if layout.size.bytes() == 64 => cx.type_vector(cx.type_f64(), 8),
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if cx.sess().asm_arch == Some(InlineAsmArch::X86)
+            && s.primitive() == Primitive::Float(Float::F128) =>
+        {
+            cx.type_vector(cx.type_i32(), 4)
+        }
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Scalar(s),
+        ) if s.primitive() == Primitive::Float(Float::F16) => cx.type_vector(cx.type_i16(), 8),
+        (
+            InlineAsmRegClass::X86(
+                X86InlineAsmRegClass::xmm_reg
+                | X86InlineAsmRegClass::ymm_reg
+                | X86InlineAsmRegClass::zmm_reg,
+            ),
+            Abi::Vector { element, count: count @ (8 | 16) },
+        ) if element.primitive() == Primitive::Float(Float::F16) => {
+            cx.type_vector(cx.type_i16(), count)
+        }
         (
             InlineAsmRegClass::Arm(ArmInlineAsmRegClass::sreg | ArmInlineAsmRegClass::sreg_low16),
             Abi::Scalar(s),

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -394,10 +394,15 @@ fn print_target_features(out: &mut dyn PrintBackendInfo, sess: &Session, tm: &ll
             (*feature, desc)
         })
         .collect::<Vec<_>>();
+
+    // Since we add this at the end ...
     rustc_target_features.extend_from_slice(&[(
         "crt-static",
         "Enables C Run-time Libraries to be statically linked",
     )]);
+    // ... we need to sort the list again.
+    rustc_target_features.sort();
+
     llvm_target_features.retain(|(f, _d)| !known_llvm_target_features.contains(f));
 
     let max_feature_len = llvm_target_features

compiler/rustc_const_eval/src/interpret/operator.rs

@@ -357,14 +357,18 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 let left = left.to_scalar();
                 let right = right.to_scalar();
                 Ok(match fty {
-                    FloatTy::F16 => unimplemented!("f16_f128"),
+                    FloatTy::F16 => {
+                        self.binary_float_op(bin_op, layout, left.to_f16()?, right.to_f16()?)
+                    }
                     FloatTy::F32 => {
                         self.binary_float_op(bin_op, layout, left.to_f32()?, right.to_f32()?)
                     }
                     FloatTy::F64 => {
                         self.binary_float_op(bin_op, layout, left.to_f64()?, right.to_f64()?)
                     }
-                    FloatTy::F128 => unimplemented!("f16_f128"),
+                    FloatTy::F128 => {
+                        self.binary_float_op(bin_op, layout, left.to_f128()?, right.to_f128()?)
+                    }
                 })
             }
             _ if left.layout.ty.is_integral() => {
@@ -424,11 +428,16 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
             }
             ty::Float(fty) => {
                 let val = val.to_scalar();
+                if un_op != Neg {
+                    span_bug!(self.cur_span(), "Invalid float op {:?}", un_op);
+                }
+
                 // No NaN adjustment here, `-` is a bitwise operation!
-                let res = match (un_op, fty) {
-                    (Neg, FloatTy::F32) => Scalar::from_f32(-val.to_f32()?),
-                    (Neg, FloatTy::F64) => Scalar::from_f64(-val.to_f64()?),
-                    _ => span_bug!(self.cur_span(), "Invalid float op {:?}", un_op),
+                let res = match fty {
+                    FloatTy::F16 => Scalar::from_f16(-val.to_f16()?),
+                    FloatTy::F32 => Scalar::from_f32(-val.to_f32()?),
+                    FloatTy::F64 => Scalar::from_f64(-val.to_f64()?),
+                    FloatTy::F128 => Scalar::from_f128(-val.to_f128()?),
                 };
                 Ok(ImmTy::from_scalar(res, layout))
             }

compiler/rustc_expand/src/mbe/transcribe.rs

@@ -31,7 +31,7 @@ impl MutVisitor for Marker {
         // it's some advanced case with macro-generated macros. So if we cache the marked version
         // of that context once, we'll typically have a 100% cache hit rate after that.
         let Marker(expn_id, transparency, ref mut cache) = *self;
-        span.update_ctxt(|ctxt| {
+        *span = span.map_ctxt(|ctxt| {
             *cache
                 .entry(ctxt)
                 .or_insert_with(|| ctxt.apply_mark(expn_id.to_expn_id(), transparency))

compiler/rustc_hir_analysis/src/check/intrinsicck.rs

@@ -62,8 +62,10 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
             ty::Int(IntTy::I64) | ty::Uint(UintTy::U64) => Some(InlineAsmType::I64),
             ty::Int(IntTy::I128) | ty::Uint(UintTy::U128) => Some(InlineAsmType::I128),
             ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize) => Some(asm_ty_isize),
+            ty::Float(FloatTy::F16) => Some(InlineAsmType::F16),
             ty::Float(FloatTy::F32) => Some(InlineAsmType::F32),
             ty::Float(FloatTy::F64) => Some(InlineAsmType::F64),
+            ty::Float(FloatTy::F128) => Some(InlineAsmType::F128),
             ty::FnPtr(_) => Some(asm_ty_isize),
             ty::RawPtr(ty, _) if self.is_thin_ptr_ty(ty) => Some(asm_ty_isize),
             ty::Adt(adt, args) if adt.repr().simd() => {
@@ -105,8 +107,10 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
                             width => bug!("unsupported pointer width: {width}"),
                         })
                     }
+                    ty::Float(FloatTy::F16) => Some(InlineAsmType::VecF16(size)),
                     ty::Float(FloatTy::F32) => Some(InlineAsmType::VecF32(size)),
                     ty::Float(FloatTy::F64) => Some(InlineAsmType::VecF64(size)),
+                    ty::Float(FloatTy::F128) => Some(InlineAsmType::VecF128(size)),
                     _ => None,
                 }
             }

compiler/rustc_middle/src/mir/interpret/value.rs

@@ -69,6 +69,13 @@ impl<Prov: Provenance> fmt::LowerHex for Scalar<Prov> {
     }
 }
 
+impl<Prov> From<Half> for Scalar<Prov> {
+    #[inline(always)]
+    fn from(f: Half) -> Self {
+        Scalar::from_f16(f)
+    }
+}
+
 impl<Prov> From<Single> for Scalar<Prov> {
     #[inline(always)]
     fn from(f: Single) -> Self {
@@ -83,6 +90,13 @@ impl<Prov> From<Double> for Scalar<Prov> {
     }
 }
 
+impl<Prov> From<Quad> for Scalar<Prov> {
+    #[inline(always)]
+    fn from(f: Quad) -> Self {
+        Scalar::from_f128(f)
+    }
+}
+
 impl<Prov> From<ScalarInt> for Scalar<Prov> {
     #[inline(always)]
     fn from(ptr: ScalarInt) -> Self {

compiler/rustc_smir/src/rustc_smir/context.rs

@@ -64,9 +64,10 @@ impl<'tcx> Context for TablesWrapper<'tcx> {
     }
 
     fn has_body(&self, def: DefId) -> bool {
-        let tables = self.0.borrow();
-        let def_id = tables[def];
-        tables.tcx.is_mir_available(def_id)
+        let mut tables = self.0.borrow_mut();
+        let tcx = tables.tcx;
+        let def_id = def.internal(&mut *tables, tcx);
+        tables.item_has_body(def_id)
     }
 
     fn foreign_modules(&self, crate_num: CrateNum) -> Vec<stable_mir::ty::ForeignModuleDef> {
@@ -323,13 +324,6 @@ impl<'tcx> Context for TablesWrapper<'tcx> {
         tcx.intrinsic(def_id).unwrap().name.to_string()
     }
 
-    fn intrinsic_must_be_overridden(&self, def: IntrinsicDef) -> bool {
-        let mut tables = self.0.borrow_mut();
-        let tcx = tables.tcx;
-        let def_id = def.0.internal(&mut *tables, tcx);
-        tcx.intrinsic_raw(def_id).unwrap().must_be_overridden
-    }
-
     fn closure_sig(&self, args: &GenericArgs) -> PolyFnSig {
         let mut tables = self.0.borrow_mut();
         let tcx = tables.tcx;
@@ -516,7 +510,7 @@ impl<'tcx> Context for TablesWrapper<'tcx> {
         let mut tables = self.0.borrow_mut();
         let instance = tables.instances[def];
         tables
-            .has_body(instance)
+            .instance_has_body(instance)
             .then(|| BodyBuilder::new(tables.tcx, instance).build(&mut *tables))
     }
 

compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -51,16 +51,33 @@ impl<'tcx> Tables<'tcx> {
         self.mir_consts.create_or_fetch(constant)
     }
 
-    pub(crate) fn has_body(&self, instance: Instance<'tcx>) -> bool {
+    /// Return whether the instance as a body available.
+    ///
+    /// Items and intrinsics may have a body available from its definition.
+    /// Shims body may be generated depending on their type.
+    pub(crate) fn instance_has_body(&self, instance: Instance<'tcx>) -> bool {
         let def_id = instance.def_id();
-        self.tcx.is_mir_available(def_id)
+        self.item_has_body(def_id)
             || !matches!(
                 instance.def,
                 ty::InstanceDef::Virtual(..)
                     | ty::InstanceDef::Intrinsic(..)
                     | ty::InstanceDef::Item(..)
             )
     }
+
+    /// Return whether the item has a body defined by the user.
+    ///
+    /// Note that intrinsics may have a placeholder body that shouldn't be used in practice.
+    /// In StableMIR, we handle this case as if the body is not available.
+    pub(crate) fn item_has_body(&self, def_id: DefId) -> bool {
+        let must_override = if let Some(intrinsic) = self.tcx.intrinsic(def_id) {
+            intrinsic.must_be_overridden
+        } else {
+            false
+        };
+        !must_override && self.tcx.is_mir_available(def_id)
+    }
 }
 
 /// Build a stable mir crate from a given crate number.

compiler/rustc_span/src/lib.rs

@@ -520,6 +520,7 @@ impl SpanData {
     pub fn with_hi(&self, hi: BytePos) -> Span {
         Span::new(self.lo, hi, self.ctxt, self.parent)
     }
+    /// Avoid if possible, `Span::map_ctxt` should be preferred.
     #[inline]
     fn with_ctxt(&self, ctxt: SyntaxContext) -> Span {
         Span::new(self.lo, self.hi, ctxt, self.parent)
@@ -576,9 +577,8 @@ impl Span {
         self.data().with_hi(hi)
     }
     #[inline]
-    pub fn with_ctxt(mut self, ctxt: SyntaxContext) -> Span {
-        self.update_ctxt(|_| ctxt);
-        self
+    pub fn with_ctxt(self, ctxt: SyntaxContext) -> Span {
+        self.map_ctxt(|_| ctxt)
     }
     #[inline]
     pub fn parent(self) -> Option<LocalDefId> {
@@ -1059,9 +1059,8 @@ impl Span {
     }
 
     #[inline]
-    pub fn apply_mark(mut self, expn_id: ExpnId, transparency: Transparency) -> Span {
-        self.update_ctxt(|ctxt| ctxt.apply_mark(expn_id, transparency));
-        self
+    pub fn apply_mark(self, expn_id: ExpnId, transparency: Transparency) -> Span {
+        self.map_ctxt(|ctxt| ctxt.apply_mark(expn_id, transparency))
     }
 
     #[inline]
@@ -1109,15 +1108,13 @@ impl Span {
     }
 
     #[inline]
-    pub fn normalize_to_macros_2_0(mut self) -> Span {
-        self.update_ctxt(|ctxt| ctxt.normalize_to_macros_2_0());
-        self
+    pub fn normalize_to_macros_2_0(self) -> Span {
+        self.map_ctxt(|ctxt| ctxt.normalize_to_macros_2_0())
     }
 
     #[inline]
-    pub fn normalize_to_macro_rules(mut self) -> Span {
-        self.update_ctxt(|ctxt| ctxt.normalize_to_macro_rules());
-        self
+    pub fn normalize_to_macro_rules(self) -> Span {
+        self.map_ctxt(|ctxt| ctxt.normalize_to_macro_rules())
     }
 }