From eacb85eb24c381e38a76d3ad9b2d678c29c171f5 Mon Sep 17 00:00:00 2001
From: Georg-Johann Lay <avr@gjlay.de>
Date: Wed, 29 Jan 2025 18:21:07 +0100
Subject: [PATCH] AVR: Allow to share libgcc's __negsi2.

libgcc has a module for __negsi2:  REG_22:SI := - REG_22:SI.
This patch adds a pattern that allows to share that function
provided optimize_size.

gcc/
	* config/avr/avr.md (*negsi2.libgcc): New insn.
---
 gcc/config/avr/avr.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index 1c956114a4b..06e31aa7d72 100644
--- a/gcc/config/avr/avr.md
+++ b/gcc/config/avr/avr.md
@@ -6299,6 +6299,15 @@
   ""
   [(set_attr "isa" "*,*,mov,movw")])
 
+(define_insn "*negsi2.libgcc"
+  [(set (reg:SI REG_22)
+        (neg:SI (reg:SI REG_22)))
+   (clobber (reg:CC REG_CC))]
+  "reload_completed
+   && optimize_size"
+  "%~call __negsi2"
+  [(set_attr "type" "xcall")])
+
 (define_insn "*negsi2"
   [(set (match_operand:SI 0 "register_operand"       "=!d,r,&r,&r")
         (neg:SI (match_operand:SI 1 "register_operand" "0,0,r ,r")))
-- 
2.47.2