optimization/5968: flow.c ICE compiling 254.gap on ia64 with -O2 -funroll-loops

[Janis Johnson]

The following reply was made to PR optimization/5968; it has been noted by GNATS.

From: Janis Johnson <janis187@us.ibm.com>
To: law@redhat.com
Cc: janis187@us.ibm.com, gcc-gnats@gcc.gnu.org
Subject: Re: optimization/5968: flow.c ICE compiling 254.gap on ia64 with -O2 -funroll-loops
Date: Thu, 14 Mar 2002 15:00:52 -0800

 On Thu, Mar 14, 2002 at 03:44:08PM -0700, law@redhat.com wrote:
 > In message <20020314222241.8465.qmail@sources.redhat.com>, janis187@us.ibm.com 
 > writes:
 >  > 
 >  > >Number:         5968
 >  > >Category:       optimization
 >  > >Synopsis:       flow.c ICE compiling 254.gap on ia64 with -O2 -funroll-loop
 >  > s
 >  > >Class:          ice-on-legal-code
 >  > >Submitter-Id:   net
 >  > >Arrival-Date:   Thu Mar 14 14:26:01 PST 2002
 >  > >Release:        gcc version 3.1 20020314 (prerelease)
 >  > >Environment:
 >  > Itanium, Red Hat Linux release 7.1.94 (Roswell)
 >  > >Description:
 >  > GCC 3.1 prerelease gets an ICE compiling 254.gap from SPEC
 >  > CPU2000 with "-O2 -funroll-loops" on ia64-unknown-linux-gnu.
 >  > Compiler output is:
 >  > 
 >  > bug.c: In function `f':
 >  > bug.c:49: Attempt to delete prologue/epilogue insn:
 >  > (insn 553 551 555 (set (reg:DI 333 ar.lc)
 >  >         (reg:DI 34 r35)) -1 (nil)
 >  >     (nil))
 >  > bug.c:49: Internal compiler error in propagate_one_insn, at flow.c:1573
 > There's a reasonable chance this patch from Jakub will fix your problem.
 > It was approved by Richard this afternoon.
 > 
 > > 	PR optimization/5891
 > > 	* unroll.c (copy_loop_body) [CALL_INSN]: Copy SIBLING_CALL_P flag.
 
 I should have mentioned in the PR that although this appears to be the
 same as the bug described in PR 5891, it occurs even with Jakub's fix
 for 5891.
 
 Janis