Re: c/6893: gcc generates invalid code for x86 subarches.

["Zephaniah E. Hull" <warp@babylon.d2dc.net>]

The following reply was made to PR c/6893; it has been noted by GNATS.

From: "Zephaniah E\. Hull" <warp@babylon.d2dc.net>
To: Glen Nakamura <glen@imodulo.com>
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Subject: Re: c/6893: gcc generates invalid code for x86 subarches.
Date: Sat, 1 Jun 2002 14:30:28 -0400

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 On Sat, Jun 01, 2002 at 05:48:44AM -1000, Glen Nakamura wrote:
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=3Dview%20audit-trail&database=
 =3Dgcc&pr=3D6893
 >=20
 > Aloha,
 >=20
 > Looks like the testcase you provided has an aliasing problem:
 > icolor =3D (int *) tmp;
 >=20
 > Strict aliasing does not allow casting from (float *) to (int *)...
 > You will need to fix your code or compile w/ -fno-strict-aliasing.
 > See the GCC documentation on -fstrict-aliasing for more information.
 
 Ah, thank you.
 
 Caught by changes in what is activated by -O2.
 
 Now if I can isolate what is getting killed by -fregmove I'll have this
 actually working properly with gcc 3.1.
 >=20
 > Please check if your problem persists with the attached testcase.
 
 Seems to be gone.
 >=20
 > - Glen Nakamura
 
 Zephaniah E. Hull.
 
 --=20
 	1024D/E65A7801 Zephaniah E. Hull <warp@babylon.d2dc.net>
 	   92ED 94E4 B1E6 3624 226D  5727 4453 008B E65A 7801
 	    CCs of replies from mailing lists are requested.
 
 Well, of course.  That's what Unix sysadmins do.  We make things
 work.  Even if they're things which are outside our job description
 or supposed area of expertise.
 
 As to the other proposal of breaking them for 6 months first, I
 will offer a quote from an MCSE I once met:
 
 "You're a Unix sysadmin?  You're the bad guys.  You keep things
 working."
 
 Pretty obvious who gets paid when things break, and who gets paid
 when they don't.
   -- Dan Birchall in the Scary Devil Monastery.
 
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