File m68k-notice-update-cc.patch of Package cross-aarch64-gcc48-icecream-backend
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index 5e3236f..7035504 100644
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -4209,6 +4209,13 @@ notice_update_cc (rtx exp, rtx insn)
&& cc_status.value2
&& reg_overlap_mentioned_p (cc_status.value1, cc_status.value2))
cc_status.value2 = 0;
+ /* Check for PRE_DEC in dest modifying a register used in src. */
+ if (cc_status.value1 && GET_CODE (cc_status.value1) == MEM
+ && GET_CODE (XEXP (cc_status.value1, 0)) == PRE_DEC
+ && cc_status.value2
+ && reg_overlap_mentioned_p (XEXP (XEXP (cc_status.value1, 0), 0),
+ cc_status.value2))
+ cc_status.value2 = 0;
if (((cc_status.value1 && FP_REG_P (cc_status.value1))
|| (cc_status.value2 && FP_REG_P (cc_status.value2))))
cc_status.flags = CC_IN_68881;