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[avr-gcc-list] Re: bugfix for cselib_invalidate_regno
From: |
Denis Chertykov |
Subject: |
[avr-gcc-list] Re: bugfix for cselib_invalidate_regno |
Date: |
22 May 2003 18:52:43 +0400 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
Denis Chertykov <address@hidden> writes:
> I have founded a bug in cselib.c:cselib_invalidate_regno.
> The avr port triggers this bug.
> Current version of cselib_invalidate_regno didn't invalidate lower
> register numbers if they contain values that overlap REGNO in case
> that (regno < FIRST_PSEUDO_REGISTER && mode == VOIDmode). This happens
> if cselib_invalidate_regno called from cselib_process_insn which
> handle CALL_INSN.
> IE
>
> /* If this is a call instruction, forget anything stored in a
> call clobbered register, or, if this is not a const call, in
> memory. */
> if (GET_CODE (insn) == CALL_INSN)
> {
> for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
> if (call_used_regs[i])
> cselib_invalidate_regno (i, VOIDmode);
>
>
> Can I apply the following patch to mainline and 3.3 branches ?
>
> Denis.
>
>
> Index: cselib.c
> ===================================================================
> RCS file: /cvsroot/gcc/egcs/gcc/cselib.c,v
> retrieving revision 1.27
> diff -c -3 -p -r1.27 cselib.c
> *** cselib.c 17 Apr 2003 01:07:12 -0000 1.27
> --- cselib.c 19 May 2003 11:09:38 -0000
> *************** cselib_invalidate_regno (regno, mode)
> *** 1019,1032 ****
> pseudos, only REGNO is affected. For hard regs, we must take MODE
> into account, and we must also invalidate lower register numbers
> if they contain values that overlap REGNO. */
> ! if (regno < FIRST_PSEUDO_REGISTER && mode != VOIDmode)
> {
> if (regno < max_value_regs)
> i = 0;
> else
> i = regno - max_value_regs;
>
> ! endregno = regno + HARD_REGNO_NREGS (regno, mode);
> }
> else
> {
> --- 1019,1033 ----
> pseudos, only REGNO is affected. For hard regs, we must take MODE
> into account, and we must also invalidate lower register numbers
> if they contain values that overlap REGNO. */
> ! if (regno < FIRST_PSEUDO_REGISTER)
> {
> if (regno < max_value_regs)
> i = 0;
> else
> i = regno - max_value_regs;
>
> ! endregno = regno
> ! + (mode != VOIDmode ? HARD_REGNO_NREGS (regno, mode) : 1);
> }
> else
> {
Anybody, please, review my tiny patch.
Denis.