re PR rtl-optimization/3783 (gcc3.0/ia64 ICE on linux kernel file fs/ufs/super.c)

Fix for PR 3783.
	* alias.c (clear_reg_alias_info): New.
	* flow.c (attempt_auto_inc): Call clear_reg_alias_info.
	* rtl.h (clear_reg_alias_info): Declare.

From-SVN: r45482

1 files changed, 3 insertions, 0 deletions

diff --git a/gcc/flow.c b/gcc/flow.c
index 8ca0877..1cbb0f8 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -7027,6 +7027,9 @@ attempt_auto_inc (pbi, inc, insn, mem, incr, incr_reg)
       for (temp = insn; temp != incr; temp = NEXT_INSN (temp))
 	if (GET_CODE (temp) == CALL_INSN)
 	  REG_N_CALLS_CROSSED (regno)++;
+
+      /* Invalidate alias info for Q since we just changed its value.  */
+      clear_reg_alias_info (q);
     }
   else
     return;