Enable Xtensa codegen for rustc_codegen_gcc

* Updates uses of object::Architecture within the compiler

Author: MabezDev

compiler/rustc_codegen_gcc/src/asm.rs

@@ -690,6 +690,9 @@ fn reg_to_gcc(reg: InlineAsmRegOrRegClass) -> ConstraintOrRegister {
             }
             InlineAsmRegClass::Sparc(SparcInlineAsmRegClass::reg) => "r",
             InlineAsmRegClass::Sparc(SparcInlineAsmRegClass::yreg) => unreachable!("clobber-only"),
+            InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::reg) => "r",
+            InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::freg) => "f",
+            InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::breg) => "b",
             InlineAsmRegClass::Err => unreachable!(),
         },
     };
@@ -779,7 +782,10 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::freg) => cx.type_f32(),
         InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
             bug!("GCC backend does not support SPIR-V")
-        }
+        },
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::reg) => cx.type_i32(),
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::freg) => cx.type_f32(),
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::breg) => cx.type_i8(), // FIXME: should this be i1?
         InlineAsmRegClass::Err => unreachable!(),
     }
 }
@@ -956,7 +962,10 @@ fn modifier_to_gcc(
         InlineAsmRegClass::CSKY(_) => None,
         InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
             bug!("LLVM backend does not support SPIR-V")
-        }
+        },
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::reg) => unimplemented!(),
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::freg) => unimplemented!(),
+        InlineAsmRegClass::Xtensa(XtensaInlineAsmRegClass::breg) => unimplemented!(),
         InlineAsmRegClass::Err => unreachable!(),
     }
 }

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -249,6 +249,7 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
         "loongarch64" => (Architecture::LoongArch64, None),
         "csky" => (Architecture::Csky, None),
         "arm64ec" => (Architecture::Aarch64, Some(SubArchitecture::Arm64EC)),
+        "xtensa" => (Architecture::Xtensa, None),
         // Unsupported architecture.
         _ => return None,
     };