From: "Jessica Han" <jessica@cup.hp.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] Re: optimization/3783
Date: Tue, 04 Sep 2001 20:33:04 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590698805119@msgid-missing> (raw)
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%26pr783%26database=gcc
It seems this problem occurs only when we have POST_INC addressing mode.
With POST_INC, for rtl "set reg351, reg328 PLUS 1", attempt_auto_inc
(flow.c) will change reg328 into reg351 as an operand of POST_INC, but leave
the "PLUS" as is. Thus the RTL becomes "set reg 351, reg351 PLUS 1" and
causes the infinite recursion in canon_rtx. If I substitute "reg328 PLUS 1"
with POST_INC reg351, the testcase attached in GNAT will pass at compile
time.
The fix I did is in attempt_auto_inc:
< validate_change (incr, &XEXP (y, opnum), q, 1);
---
> validate_change (incr, &y, inc, 1);
Is this the right thing to do? Thanks.
next reply other threads:[~2001-09-04 20:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-04 20:33 Jessica Han [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-08-01 22:02 [Linux-ia64] Re: optimization/3783 Steve Ellcey
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