https://gcc.gnu.org/r238850
Applied this obvious change to __muldi3 which cleared zero_reg at the end of
the function. This is not needed because there was a call to __umulsidi3 which
already cleared zero_reg.
Johann
libgcc/
* config/avr/lib1funcs.S (__muldi3) [have MUL]: No need to clear
zero_reg as previous call to __umulhisi3 already cleared it.
Index: config/avr/lib1funcs.S
===================================================================
--- config/avr/lib1funcs.S (revision 238849)
+++ config/avr/lib1funcs.S (working copy)
@@ -958,7 +958,6 @@ DEFUN __muldi3
wmov A4, C4
wmov A6, C6
- clr __zero_reg__
pop r16
pop r17
pop r28
