1 files changed, 130 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/asm/loongarch.rs b/compiler/rustc_target/src/asm/loongarch.rs
new file mode 100644
index 000000000..9d1a4f3ee
--- /dev/null
+++ b/compiler/rustc_target/src/asm/loongarch.rs
@@ -0,0 +1,130 @@
+use super::{InlineAsmArch, InlineAsmType};
+use rustc_macros::HashStable_Generic;
+use rustc_span::Symbol;
+use std::fmt;
+
+def_reg_class! {
+    LoongArch LoongArchInlineAsmRegClass {
+        reg,
+        freg,
+    }
+}
+
+impl LoongArchInlineAsmRegClass {
+    pub fn valid_modifiers(self, _arch: super::InlineAsmArch) -> &'static [char] {
+        &[]
+    }
+
+    pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> {
+        None
+    }
+
+    pub fn suggest_modifier(
+        self,
+        _arch: InlineAsmArch,
+        _ty: InlineAsmType,
+    ) -> Option<(char, &'static str)> {
+        None
+    }
+
+    pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<(char, &'static str)> {
+        None
+    }
+
+    pub fn supported_types(
+        self,
+        _arch: InlineAsmArch,
+    ) -> &'static [(InlineAsmType, Option<Symbol>)] {
+        match self {
+            Self::reg => types! { _: I8, I16, I32, I64, F32, F64; },
+            Self::freg => types! { _: F32, F64; },
+        }
+    }
+}
+
+// The reserved registers are taken from <https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/LoongArch/LoongArchRegisterInfo.cpp#79>
+def_regs! {
+    LoongArch LoongArchInlineAsmReg LoongArchInlineAsmRegClass {
+        r1: reg = ["$r1","$ra"],
+        r4: reg = ["$r4","$a0"],
+        r5: reg = ["$r5","$a1"],
+        r6: reg = ["$r6","$a2"],
+        r7: reg = ["$r7","$a3"],
+        r8: reg = ["$r8","$a4"],
+        r9: reg = ["$r9","$a5"],
+        r10: reg = ["$r10","$a6"],
+        r11: reg = ["$r11","$a7"],
+        r12: reg = ["$r12","$t0"],
+        r13: reg = ["$r13","$t1"],
+        r14: reg = ["$r14","$t2"],
+        r15: reg = ["$r15","$t3"],
+        r16: reg = ["$r16","$t4"],
+        r17: reg = ["$r17","$t5"],
+        r18: reg = ["$r18","$t6"],
+        r19: reg = ["$r19","$t7"],
+        r20: reg = ["$r20","$t8"],
+        r23: reg = ["$r23","$s0"],
+        r24: reg = ["$r24","$s1"],
+        r25: reg = ["$r25","$s2"],
+        r26: reg = ["$r26","$s3"],
+        r27: reg = ["$r27","$s4"],
+        r28: reg = ["$r28","$s5"],
+        r29: reg = ["$r29","$s6"],
+        r30: reg = ["$r30","$s7"],
+        f0: freg = ["$f0","$fa0"],
+        f1: freg = ["$f1","$fa1"],
+        f2: freg = ["$f2","$fa2"],
+        f3: freg = ["$f3","$fa3"],
+        f4: freg = ["$f4","$fa4"],
+        f5: freg = ["$f5","$fa5"],
+        f6: freg = ["$f6","$fa6"],
+        f7: freg = ["$f7","$fa7"],
+        f8: freg = ["$f8","$ft0"],
+        f9: freg = ["$f9","$ft1"],
+        f10: freg = ["$f10","$ft2"],
+        f11: freg = ["$f11","$ft3"],
+        f12: freg = ["$f12","$ft4"],
+        f13: freg = ["$f13","$ft5"],
+        f14: freg = ["$f14","$ft6"],
+        f15: freg = ["$f15","$ft7"],
+        f16: freg = ["$f16","$ft8"],
+        f17: freg = ["$f17","$ft9"],
+        f18: freg = ["$f18","$ft10"],
+        f19: freg = ["$f19","$ft11"],
+        f20: freg = ["$f20","$ft12"],
+        f21: freg = ["$f21","$ft13"],
+        f22: freg = ["$f22","$ft14"],
+        f23: freg = ["$f23","$ft15"],
+        f24: freg = ["$f24","$fs0"],
+        f25: freg = ["$f25","$fs1"],
+        f26: freg = ["$f26","$fs2"],
+        f27: freg = ["$f27","$fs3"],
+        f28: freg = ["$f28","$fs4"],
+        f29: freg = ["$f29","$fs5"],
+        f30: freg = ["$f30","$fs6"],
+        f31: freg = ["$f31","$fs7"],
+        #error = ["$r0","$zero"] =>
+            "constant zero cannot be used as an operand for inline asm",
+        #error = ["$r2","$tp"] =>
+            "reserved for TLS",
+        #error = ["$r3","$sp"] =>
+            "the stack pointer cannot be used as an operand for inline asm",
+        #error = ["$r21"] =>
+            "reserved by the ABI",
+        #error = ["$r22","$fp"] =>
+            "the frame pointer cannot be used as an operand for inline asm",
+        #error = ["$r31","$s8"] =>
+            "$r31 is used internally by LLVM and cannot be used as an operand for inline asm",
+    }
+}
+
+impl LoongArchInlineAsmReg {
+    pub fn emit(
+        self,
+        out: &mut dyn fmt::Write,
+        _arch: InlineAsmArch,
+        _modifier: Option<char>,
+    ) -> fmt::Result {
+        out.write_str(self.name())
+    }
+}