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From: Jeffrey A Law <law@cygnus.com>
To: Weiwen Liu <liu@hepvms.physics.yale.edu>
Cc: egcs-bugs@cygnus.com
Subject: Re: optimization bug
Date: Sun, 21 Sep 1997 21:28:00 -0000	[thread overview]
Message-ID: <19773.874899819@hurl.cygnus.com> (raw)
In-Reply-To: <Pine.OSF.3.96.970921210021.4151A-100000@hepunix1.physics.yale.edu>

  In message < Pine.OSF.3.96.970921210021.4151A-100000@hepunix1.physics.yale.edu >you write:
  > Hi, 
  > I found that the bug is due to replace a register in a USE RTL with
  > its value.
Can you explain exactly why the compiler core dumped and why
you patch fixes the problem?

Using your testcase, compiling with -O2 I don't get an abort.

There are 3 instances where we have USE insns which have a
REG_DEAD note attached to them:

(insn 96 52 53 (use (reg:DI 92)) -1 (nil)
    (expr_list:REG_DEAD (reg:DI 92)
        (nil)))


(insn 95 88 64 (use (reg:DI 90)) -1 (nil)
    (expr_list:REG_DEAD (reg:DI 90)
        (nil)))


(insn 72 73 97 (use (reg/i:DI 0 $0)) -1 (nil)
    (expr_list:REG_DEAD (reg/i:DI 0 $0)
        (nil)))


In each and every case reg_equiv_replace is zero for the register
in question -- which would prevent the replacement code from
doing anything.

So, what exactly is the problem?
 
 Jeff


  reply	other threads:[~1997-09-21 21:28 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1997-09-21 18:07 Weiwen Liu
1997-09-21 21:28 ` Jeffrey A Law [this message]
1997-09-21 21:28   ` Weiwen Liu
1997-09-22 11:08     ` Jeffrey A Law
1997-09-22 22:55       ` Jim Wilson
1997-09-23 13:08         ` Jim Wilson
1997-09-24  7:51           ` Weiwen Liu
1997-11-02 22:26 ` Jeffrey A Law
  -- strict thread matches above, loose matches on Subject: below --
2003-03-10 14:24 surjan
2003-03-10 15:31 ` Tim Prince
2002-01-04  6:20 Calin Cascaval
     [not found] <20000812004418.A4935@a2000.nl>
2000-08-12  9:30 ` Optimization bug Richard Henderson
2000-03-24 12:07 Gerald Gutierrez
2000-03-22  1:41 optimization bug Andrea Latina
1999-12-31 20:54 Optimization bug Peter R. Torpman
1999-12-31 20:54 ` Nathan Sidwell
1999-03-31 23:54 Hyman Rosen
1999-03-31 23:54 ` Jeffrey A Law
1999-03-31 23:54   ` Hyman Rosen
1998-10-27 11:04 optimization bug Valentin Bonnard
1998-10-25 21:47 Kaoru Fukui
1998-10-22 10:56 Dima Volodin
1998-10-25 12:17 ` Valentin Bonnard
1998-10-25 17:41   ` Dima Volodin
1998-10-26 18:00     ` Alexandre Oliva
1998-10-27  8:56       ` Dima Volodin
1998-10-27 11:04         ` Alexandre Oliva
1998-10-27  9:54           ` Dima Volodin
1998-10-12 11:18 Optimization bug Phillip Ezolt
1999-01-13  5:41 ` Jeffrey A Law
1997-09-19 21:03 optimization bug Weiwen Liu

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