Test gcc.c-torture/execute/memcpy-bi.c (-O2) failed for attiny40 device.
Cause seems to be in "load from memory" as it is not restoring base
register after load instructions generated.
Function avr_out_load_psi_reg_no_disp_tiny in avr.c:
It returns just after emitting instructions to load from memory to
registers. It is important to restore the base register if it is
not marked dead/unused after that insn.
Code to restore base register is present already. Below patch let
the function do the restore before return.
If OK, could someone commit? I do not have commit access.
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c
index 4e83de8..b653858 100644
--- a/gcc/config/avr/avr.c
+++ b/gcc/config/avr/avr.c
@@ -4365,9 +4365,9 @@ avr_out_load_psi_reg_no_disp_tiny (rtx insn, rtx *op, int
*plen)
}
else
{
- return avr_asm_len ("ld %A0,%1+" CR_TAB
- "ld %B0,%1+" CR_TAB
- "ld %C0,%1", op, plen, -3);
+ avr_asm_len ("ld %A0,%1+" CR_TAB
+ "ld %B0,%1+" CR_TAB
+ "ld %C0,%1", op, plen, -3);
if (reg_dest != reg_base - 2 &&
!reg_unused_after (insn, base))
Regards,
Pitchumani
gcc/ChangeLog
2015-05-19 Pitchumani Sivanupandi <[email protected]>
* config/avr/avr.c (avr_out_load_psi_reg_no_disp_tiny): Restore base
register if not marked dead/unused, before return.
