From: Georg-Johann Lay <avr@gjlay.de>
Date: Sun, 7 Sep 2025 10:19:26 +0000 (+0200)
Subject: AVR: ad target/121794 - Invoke zero_reg less.
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=73126534491dfa64bc9778fa6a6ca65a62d1dbf4;p=thirdparty%2Fgcc.git

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 --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index f8bbdc76608..3ca0efbbe75 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")])