[gcc r15-10293] AVR: ad target/121794 - Invoke zero_reg less.

[Georg-Johann Lay]

https://gcc.gnu.org/g:73126534491dfa64bc9778fa6a6ca65a62d1dbf4

commit r15-10293-g73126534491dfa64bc9778fa6a6ca65a62d1dbf4
Author: Georg-Johann Lay <avr@gjlay.de>
Date:   Sun Sep 7 12:19:26 2025 +0200

    AVR: ad target/121794 - Invoke zero_reg less.
    
    gcc/
            PR target/121794
            * config/avr/avr.md (cmpqi3): Use cpi R,0 if possible.
    
    (cherry picked from commit 93af5f69d15934edda4ff6a6eb63bde9ae7b8e45)

Diff:
---
 gcc/config/avr/avr.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index f8bbdc766085..3ca0efbbe759 100644
--- a/gcc/config/avr/avr.md
+++ b/gcc/config/avr/avr.md
@@ -6811,13 +6811,13 @@
 ;; "cmpqq3" "cmpuqq3"
 (define_insn "cmp<mode>3"
   [(set (reg:CC REG_CC)
-        (compare:CC (match_operand:ALL1 0 "register_operand"  "r  ,r,d")
-                    (match_operand:ALL1 1 "nonmemory_operand" "Y00,r,i")))]
+        (compare:CC (match_operand:ALL1 0 "register_operand"  "d,r  ,r")
+                    (match_operand:ALL1 1 "nonmemory_operand" "i,Y00,r")))]
   "reload_completed"
   "@
-	cp %0, __zero_reg__
-	cp %0,%1
-	cpi %0,lo8(%1)"
+	cpi %0,lo8(%1)
+	cp %0,__zero_reg__
+	cp %0,%1"
   [(set_attr "length" "1,1,1")])