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Date: Tue, 27 Aug 2002 01:47:00 -0000
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Cc: gcc-prs@gcc.gnu.org,
From: Tim Prince <tprince@computer.org>
Subject: Re: c/7723: Internal compiler error - Pentium3 sse - gcc 3.2
Reply-To: Tim Prince <tprince@computer.org>
X-SW-Source: 2002-08/txt/msg00564.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR middle-end/7723; it has been noted by GNATS.

From: Tim Prince <tprince@computer.org>
To: Marco Morandini <morandini@aero.polimi.it>
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c/7723: Internal compiler error - Pentium3 sse - gcc 3.2
Date: Mon, 26 Aug 2002 22:26:38 -0700

 On Monday 26 August 2002 07:19, Marco Morandini wrote:
 > Tim Prince wrote:
 > > On Monday 26 August 2002 03:01, morandini@aero.polimi.it wrote:
 > >>>Number:         7723
 > >>>Category:       c
 > >>>Synopsis:       Internal compiler error - Pentium3 sse - gcc 3.2
 > >>>Confidential:   no
 > >>>Severity:       serious
 > >>>Priority:       medium
 > >>>Responsible:    unassigned
 > >>>State:          open
 > >>>Class:          ice-on-legal-code
 > >>>
 > >>>Description:
 > >>
 > >>1)
 > >>with this code:
 > >>/*-------------------*/
 > >>typedef int v4sf __attribute__ ((mode(V4SF)));
 > >>int main(void) {
 > >>	v4sf a={0.,0.,0.,0.};
 > >>	return 0;
 > >>};
 > >>/*------------------*/
 > >>
 > >>marco@pc-31c:~> gcc -msse -march=pentium3 -mfpmath=sse main1.c: In
 > >> function `main': main1.c:5: Internal compiler error in
 > >> instantiate_virtual_regs_1, at function.c:3972
 > >>
 > >>2)this code is compiled, but the program gives a SIGSEGV. What's wrong?
 > >>(binutils  2.13.90.0.4 20020814)
 > >>/*------------------*/
 > >>typedef int v4sf __attribute__ ((mode(V4SF)));
 > >>int main(void) {
 > >>	v4sf a={1.,1.,1.,1.};
 > >>	v4sf b={2.,2.,2.,2.};
 > >>	v4sf c;
 > >>	c=__builtin_ia32_addss (a, b);
 > >>	return 0;
 > >>};
 > >
 > > Some might argue about characterizing this as "legal code."  Perhaps it
 > > should be flagged as an error.  gcc doesn't support alignment in main(),
 > > so it seems that any code which is not standard C and depends on
 > > alignment might not be "legal."
 >
 > Opsss.....
 > Yes, I do not get the SIGSEGV after moving everything to a function
 > (If I understand correctly your answer, but I'm definitely not a
 > good programmer)
 >
 > However, I'm still getting the ICE with this:
 > /*-------------------*/
 > typedef int v4sf __attribute__ ((mode(V4SF)));
 > void dummy(void) {
 > 	v4sf c={0.,0.,0.,0.};
 > 	return;
 > };
 > /*-----------------*/
 >
 >
 > Perhaps I'm simply not smart enough to use SIMD gcc support :(
 
 -- 
 Tim Prince