More minor fallout from the IOR->PLUS change a little while ago. This
time on xstormy16.
The pattern to swap nibbles actually tries to handle all the cases of
IOR, XOR and PLUS. But when we generate PLUS earlier in the pipeline,
the simplifications/canonicalizations are slightly different resulting
in the pattern not matching.
This patch adds an alternate pattern which matches what we get now.
Basically it looks like QImode rotate by 4, zero extended to HI.
Run in my tester to verify the regression was fixed. Pushing to the trunk.
Jeff
* config/stormy16/stormy16.md (swpn_zext): New pattern.
diff --git a/gcc/config/stormy16/stormy16.md b/gcc/config/stormy16/stormy16.md
index 7f12679847b..62318345cdc 100644
--- a/gcc/config/stormy16/stormy16.md
+++ b/gcc/config/stormy16/stormy16.md
@@ -1363,6 +1363,20 @@ (define_insn "*swpn_zext"
"swpn %0 | and %0,#255"
[(set_attr "length" "6")])
+;; Alternate form when we use PLUS instead of IOR early in the
+;; expanders.
+(define_insn "*swpn_zext"
+ [(set (match_operand:HI 0 "register_operand" "=r")
+ (zero_extend:HI
+ (subreg:QI
+ (any_or_plus:HI
+ (ashift:HI (match_operand:HI 1 "register_operand" "0")
+ (const_int 4))
+ (lshiftrt:HI (match_dup 1) (const_int 4))) 0)))]
+ ""
+ "swpn %0 | and %0,#255"
+ [(set_attr "length" "6")])
+
(define_insn "*swpn_sext"
[(set (match_operand:HI 0 "register_operand" "=r")
(sign_extend:HI
