Re: inline-asm/4823: [3.2/3.3/3.4 regression] gcc reports internal compiler error on legal code

[Jan Hubicka <jh@suse.cz>]

The following reply was made to PR inline-asm/4823; it has been noted by GNATS.

From: Jan Hubicka <jh@suse.cz>
To: Steven Bosscher <s.bosscher@student.tudelft.nl>
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	rudd@cyberoptics.com, gcc-prs@gcc.gnu.org, rodrigc@gcc.gnu.org,
	jh@suse.cz
Subject: Re: inline-asm/4823: [3.2/3.3/3.4 regression] gcc reports internal compiler error on legal code
Date: Mon, 24 Mar 2003 23:38:02 +0100

 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4823
 > 
 > For Wolfgang's smaller testcase:
 > 
 > ---------------------------------
 > void
 > f (void)
 > {
 >  double result;
 >  asm volatile (
 >  " faddp %0, %1 \n\t"
 >  : "=&t" (result)
 >  : "u" (result),
 >    "0" (result)
 >  : "%st", "%st(1)", "%st(2)", "%st(3)",
 >    "%st(4)", "%st(5)", "%st(6)", "%st(7)"
 >  );
 > }
 > ------------------------
 > 
 > we now don't crash.  Instead we bail out with an error.
 > 
 > # gcc-3.3 -c 4823.c
 > 4823.c: In function `f':
 > 4823.c:5: error: output constraint 0 cannot be specified together with 
 > "st" clobber
 > 4823.c:8: confused by earlier errors, bailing out
 > # gcc-3.3 -c 4823.c -O
 > 4823.c: In function `f':
 > 4823.c:5: error: output constraint 0 cannot be specified together with 
 > "st" clobber
 > 4823.c:8: confused by earlier errors, bailing out
 > # gcc-3.3 -c 4823.c -O2
 > 4823.c: In function `f':
 > 4823.c:5: error: output constraint 0 cannot be specified together with 
 > "st" clobber
 > 4823.c:8: confused by earlier errors, bailing out
 > 
 > Honza, is this the correct behavior?
 Hmm, not really "confused by earlier errors, bailing out" means that
 compiler segfaulted.  It is different failure - the reg-stack is not
 really good at dealing with missformed asm constrains.  I believe I've
 sent a patch some time ago for similar problem, will try to dig it out,
 but probably next week - this week is bit too hectic for me.
 
 Honza
 > 
 > Greetz
 > Steven
 >