Enable Xtensa codegen for rustc_codegen_gcc

* Updates uses of object::Architecture within the compiler

Author: MabezDev

compiler/rustc_codegen_gcc/src/asm.rs

@@ -692,6 +692,9 @@ 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!(),
         },
     };
@@ -787,7 +790,10 @@ 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!(),
     }
 }
@@ -971,7 +977,10 @@ 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_target/src/spec/mod.rs

@@ -3594,6 +3594,7 @@ impl Target {
             "avr" => (Architecture::Avr, None),
             "msp430" => (Architecture::Msp430, None),
             "hexagon" => (Architecture::Hexagon, None),
+            "xtensa" => (Architecture::Xtensa, None),
             "bpf" => (Architecture::Bpf, None),
             "loongarch64" => (Architecture::LoongArch64, None),
             "csky" => (Architecture::Csky, None),