Add some comments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120598 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/include/clang/Basic/arm_neon.td b/include/clang/Basic/arm_neon.td
index c0647e8a87..e1e7bb8112 100644
--- a/include/clang/Basic/arm_neon.td
+++ b/include/clang/Basic/arm_neon.td
@@ -52,7 +52,10 @@ class Inst <string p, string t, Op o> {
   bit isShift = 0;
 }
 
-// Used to generate Builtins.def
+// Used to generate Builtins.def:
+// SInst: Instruction with signed/unsigned suffix (e.g., "s8", "u8", "p8")
+// IInst: Instruction with generic integer suffix (e.g., "i8")
+// WInst: Instruction with only bit size suffix (e.g., "8")
 class SInst<string p, string t> : Inst<p, t, OP_NONE> {}
 class IInst<string p, string t> : Inst<p, t, OP_NONE> {}
 class WInst<string p, string t> : Inst<p, t, OP_NONE> {}