Auto merge of #89937 - JohnTitor:fix-89875, r=Amanieu

Properly check `target_features` not to trigger an assertion

Fixes #89875
I think it should be a condition instead of an assertion to check if it's a register as it's possible that `reg` is a register class.
Also, this isn't related to the issue directly, but `is_target_supported` doesn't check `target_features` attributes. Is there any way to check it on rustc_codegen_llvm?

r? `@Amanieu`

Author: bors

compiler/rustc_ast_lowering/src/asm.rs

@@ -11,8 +11,8 @@ use std::fmt::Write;
 
 impl<'a, 'hir> LoweringContext<'a, 'hir> {
     crate fn lower_inline_asm(&mut self, sp: Span, asm: &InlineAsm) -> &'hir hir::InlineAsm<'hir> {
-        // Rustdoc needs to support asm! from foriegn architectures: don't try
-        // lowering the register contraints in this case.
+        // Rustdoc needs to support asm! from foreign architectures: don't try
+        // lowering the register constraints in this case.
         let asm_arch = if self.sess.opts.actually_rustdoc { None } else { self.sess.asm_arch };
         if asm_arch.is_none() && !self.sess.opts.actually_rustdoc {
             struct_span_err!(self.sess, sp, E0472, "inline assembly is unsupported on this target")
@@ -214,9 +214,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 // means that we disallow passing a value in/out of the asm and
                 // require that the operand name an explicit register, not a
                 // register class.
-                if reg_class.is_clobber_only(asm_arch.unwrap())
-                    && !(op.is_clobber() && matches!(reg, asm::InlineAsmRegOrRegClass::Reg(_)))
-                {
+                if reg_class.is_clobber_only(asm_arch.unwrap()) && !op.is_clobber() {
                     let msg = format!(
                         "register class `{}` can only be used as a clobber, \
                              not as an input or output",

compiler/rustc_codegen_gcc/src/asm.rs

@@ -118,7 +118,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         true
     }
 
-    fn codegen_inline_asm(&mut self, template: &[InlineAsmTemplatePiece], rust_operands: &[InlineAsmOperandRef<'tcx, Self>], options: InlineAsmOptions, _span: &[Span]) {
+    fn codegen_inline_asm(&mut self, template: &[InlineAsmTemplatePiece], rust_operands: &[InlineAsmOperandRef<'tcx, Self>], options: InlineAsmOptions, _span: &[Span], _instance: Instance<'_>) {
         let asm_arch = self.tcx.sess.asm_arch.unwrap();
         let is_x86 = matches!(asm_arch, InlineAsmArch::X86 | InlineAsmArch::X86_64);
         let att_dialect = is_x86 && options.contains(InlineAsmOptions::ATT_SYNTAX);

compiler/rustc_codegen_llvm/src/asm.rs

@@ -13,7 +13,7 @@ use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir as hir;
 use rustc_middle::ty::layout::TyAndLayout;
-use rustc_middle::{bug, span_bug};
+use rustc_middle::{bug, span_bug, ty::Instance};
 use rustc_span::{Pos, Span, Symbol};
 use rustc_target::abi::*;
 use rustc_target::asm::*;
@@ -120,6 +120,7 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
         operands: &[InlineAsmOperandRef<'tcx, Self>],
         options: InlineAsmOptions,
         line_spans: &[Span],
+        instance: Instance<'_>,
     ) {
         let asm_arch = self.tcx.sess.asm_arch.unwrap();
 
@@ -135,7 +136,10 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
                     let is_target_supported = |reg_class: InlineAsmRegClass| {
                         for &(_, feature) in reg_class.supported_types(asm_arch) {
                             if let Some(feature) = feature {
-                                if self.tcx.sess.target_features.contains(&Symbol::intern(feature))
+                                let codegen_fn_attrs = self.tcx.codegen_fn_attrs(instance.def_id());
+                                let feature_name = Symbol::intern(feature);
+                                if self.tcx.sess.target_features.contains(&feature_name)
+                                    || codegen_fn_attrs.target_features.contains(&feature_name)
                                 {
                                     return true;
                                 }

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -845,6 +845,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         options: ast::InlineAsmOptions,
         line_spans: &[Span],
         destination: Option<mir::BasicBlock>,
+        instance: Instance<'_>,
     ) {
         let span = terminator.source_info.span;
 
@@ -898,7 +899,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             })
             .collect();
 
-        bx.codegen_inline_asm(template, &operands, options, line_spans);
+        bx.codegen_inline_asm(template, &operands, options, line_spans, instance);
 
         if let Some(target) = destination {
             helper.funclet_br(self, &mut bx, target);
@@ -1029,6 +1030,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     options,
                     line_spans,
                     destination,
+                    self.instance,
                 );
             }
         }

compiler/rustc_codegen_ssa/src/traits/asm.rs

@@ -58,6 +58,7 @@ pub trait AsmBuilderMethods<'tcx>: BackendTypes {
         operands: &[InlineAsmOperandRef<'tcx, Self>],
         options: InlineAsmOptions,
         line_spans: &[Span],
+        instance: Instance<'_>,
     );
 }
 

src/test/ui/asm/x86_64/issue-89875.rs

@@ -0,0 +1,14 @@
+// build-pass
+// only-x86_64
+
+#![feature(asm, target_feature_11)]
+
+#[target_feature(enable = "avx")]
+fn main() {
+    unsafe {
+        asm!(
+            "/* {} */",
+            out(ymm_reg) _,
+        );
+    }
+}