[clang] [llvm] [RISC-V] Add CSR read/write builtins (PR #85091)

[Craig Topper via cfe-commits]

================
@@ -74,6 +74,21 @@ let TargetPrefix = "riscv" in {
 
 } // TargetPrefix = "riscv"
 
+let TargetPrefix = "riscv" in {
+  // Zicsr
+  def int_riscv_csrr :
+    DefaultAttrsIntrinsic<[llvm_i32_ty], [llvm_i32_ty],
+                          [IntrNoMem, IntrHasSideEffects, 
ImmArg<ArgIndex<0>>]>;
+  def int_riscv_csrr64 :
+    DefaultAttrsIntrinsic<[llvm_i64_ty], [llvm_i64_ty],
+                          [IntrNoMem, IntrHasSideEffects, 
ImmArg<ArgIndex<0>>]>;
+  def int_riscv_csrw :
+    DefaultAttrsIntrinsic<[], [llvm_i32_ty, llvm_i32_ty],
+                          [IntrNoMem, IntrHasSideEffects, 
ImmArg<ArgIndex<0>>]>;
+  def int_riscv_csrw64 :
+    DefaultAttrsIntrinsic<[], [llvm_i64_ty, llvm_i64_ty],
+                          [IntrNoMem, IntrHasSideEffects, 
ImmArg<ArgIndex<0>>]>;
+} // TargetPrefix = "riscv"
----------------
topperc wrote:

What about CSR swap?

https://github.com/llvm/llvm-project/pull/85091
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