rs6000, add comment to VEC_IC definition

This patch adds a comment to the VEC_IC definition to clarify
the V1TI "TARGET_POWER10" mode that was added.

gcc/ChangeLog:
	* config/rs6000/vector.md: Add comment for the VEC_IC
	define_mode_iterator.

diff --git a/gcc/config/rs6000/vector.md b/gcc/config/rs6000/vector.md
index 0d3e0a24e1188a1f7b5e1ad1bdb41d27ed4dd449..524ba87d6d1d2023028ebfcb98d975318d013152 100644 (file)
--- a/gcc/config/rs6000/vector.md
+++ b/gcc/config/rs6000/vector.md
@@ -26,7 +26,8 @@
 ;; Vector int modes
 (define_mode_iterator VEC_I [V16QI V8HI V4SI V2DI])
 
-;; Vector int modes for comparison, shift and rotation
+;; Vector int modes for comparison, shift and rotation.  ISA 3.1 adds the V1TI mode
+;; for the vector int128 type.
 (define_mode_iterator VEC_IC [V16QI V8HI V4SI V2DI (V1TI "TARGET_POWER10")])
 
 ;; 128-bit int modes