https://gcc.gnu.org/g:eacb85eb24c381e38a76d3ad9b2d678c29c171f5
commit r15-7276-geacb85eb24c381e38a76d3ad9b2d678c29c171f5
Author: Georg-Johann Lay <a...@gjlay.de>
Date: Wed Jan 29 18:21:07 2025 +0100
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.
Diff:
---
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 1c956114a4b8..06e31aa7d72d 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")))
