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 --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index 1c956114a4b87b196b3f7e06f26deb01291524bb..06e31aa7d72d13aacff5cf3f2d7eebb1537658bb 100644 (file)
--- 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")))