[clang] [llvm] [LoongArch] [CodeGen] Support LoongArch-specific amswap[__db].{b/h} and amadd[__db].{b/h} instructions. (PR #113255)

[Lu Weining via cfe-commits]

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@@ -2088,8 +2088,26 @@ multiclass binary_atomic_op_wd<string inst, string op, string signed = ""> {
             (!cast<Instruction>(inst#"__DB_D"#signed) GPR:$rk, GPR:$rj)>;
 }
 
+// Atomic operation for byte and half word
+multiclass binary_atomic_op_bh<string inst, string op> {
+  def : Pat<(!cast<PatFrag>(op#"_i8_monotonic") GPR:$rj, GPR:$rk),
+            (!cast<Instruction>(inst#"_B") GPR:$rk, GPR:$rj)>;
+  def : Pat<(!cast<PatFrag>(op#"_i16_monotonic") GPR:$rj, GPR:$rk),
+            (!cast<Instruction>(inst#"_H") GPR:$rk, GPR:$rj)>;
+
+  def : Pat<(!cast<PatFrag>(op#"_i8") GPR:$rj, GPR:$rk),
+            (!cast<Instruction>(inst#"__DB_B") GPR:$rk, GPR:$rj)>;
+  def : Pat<(!cast<PatFrag>(op#"_i16") GPR:$rj, GPR:$rk),
+            (!cast<Instruction>(inst#"__DB_H") GPR:$rk, GPR:$rj)>;
+}
+
 let Predicates = [IsLA64] in {
 
+let Predicates = [ HasLAM_BH ] in {
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SixWeining wrote:

Does this predicate override the predicate in line 2104?

https://github.com/llvm/llvm-project/pull/113255