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Coding eror in rtlanal.c:reg_set_last() (GCC 3.4 2004/01/21 snapshot).
- From: Anmol Paralkar <aparalka at cisco dot com>
- To: gcc-bugs at gcc dot gnu dot org
- Cc: Anmol Paralkar <aparalka at cisco dot com>
- Date: Sat, 17 Apr 2004 01:38:14 +0530 (IST)
- Subject: Coding eror in rtlanal.c:reg_set_last() (GCC 3.4 2004/01/21 snapshot).
Hello,
In rtx reg_set_last (rtx x, rtx insn), we obtain a SET/CLOBBER of 'x' via:
set = set_of (x, insn);
But once we obtain 'set', we need to compute the value 'x' was assigned by:
last_value = SET_SRC (set);
(Not as is the case currently: last_value = SET_SRC (x);)
*** 1617,1623 ****
rtx last_value;
if (GET_CODE (set) != SET || SET_DEST (set) != x)
return 0;
! last_value = SET_SRC (x);
if (CONSTANT_P (last_value)
|| ((GET_CODE (last_value) == REG
|| GET_CODE (last_value) == SUBREG)
--- 1617,1623 ----
rtx last_value;
if (GET_CODE (set) != SET || SET_DEST (set) != x)
return 0;
! last_value = SET_SRC (set);
if (CONSTANT_P (last_value)
|| ((GET_CODE (last_value) == REG
|| GET_CODE (last_value) == SUBREG)
...else a seg-fault results on use of this function.
Kindly validate. Request you to fix.
Thanks & Regards,
Anmol P. Paralkar