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Date: Fri, 12 Nov 2004 22:27:23 +0100
From: Bill Allombert <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: gcc-snapshot generate incorrect code with -O1 and up.
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--OgqxwSJOaUobr8KG
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Package: gcc-snapshot
Version: 20041030-1
Severity: normal
Hello Matthias,
gcc-snapshot generate incorrect code for the attached file with
-O1 and above. It is correctly compiled with -O0.
%gcc div.c -O0
%./a.out
1 2 4 8 5 10 20 40 25 50 100 200 125 250 500 1000
%gcc div.c -O1
%./a.out
1 2 5 10 1073835008 -1021043573 1073789904 -1073742211 134518760 15757829=
08 0 0
1073789904 0 1814429448 0
gcc 3.3 and 3.4 compile it correctly at -O3.
Cheers,
Bill.
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.26-acpi
Locale: LANG=3Dfran=E7ais, LC_CTYPE=3Dfran=E7ais (charmap=3DISO-8859-1)
Versions of packages gcc-snapshot depends on:
ii binutils 2.15-4 The GNU assembler, linker an=
d bina
ii libart-2.0-2 2.3.16-6 Library of functions for 2D =
graphi
ii libatk1.0-0 1.6.1-5 The ATK accessibility toolki=
t
ii libc6 2.3.2.ds1-18 GNU C Library: Shared librar=
ies an
ii libglib2.0-0 2.4.7-1 The GLib library of C routin=
es
ii libgtk2.0-0 2.4.13-1 The GTK+ graphical user inte=
rface=20
ii libpango1.0-0 1.4.1-4 Layout and rendering of inte=
rnatio
ii zlib1g 1:1.2.2-3 compression library - runtim=
e
-- no debconf information
--OgqxwSJOaUobr8KG
Content-Type: text/x-csrc; charset=us-ascii
Content-Disposition: attachment; filename="div.c"
#include <stdlib.h>
#include <stdio.h>
typedef long *GEN;
GEN stoi(long n)
{
GEN z=(GEN)calloc(3,sizeof(GEN));
z[2]=n;
return z;
}
GEN mulii(GEN x, GEN y) { return stoi(x[2]*y[2]); }
void
divisors_bug(long l, GEN *t, GEN e, GEN P)
{
long i, j;
GEN *d, *t1, *t2, *t3;
d = t;
*++d = stoi(1);
for (i=1; i<l; i++)
for (t1=t,j=e[i]; j; j--)
{
for (t2=d, t3=t1; t3<t2; )
*++d = mulii(*++t3, (GEN)P[i]);
t1=t2;
}
}
int main(void)
{
long e[3]={0,3,3};
long P[3]={0,(long)stoi(2),(long)stoi(5)};
GEN t[17];
long i;
divisors_bug(3,t,e,P);
for(i=1;i<17;i++)
printf("%ld ",t[i][2]);
printf("\n");
return 0;
}
--OgqxwSJOaUobr8KG--
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Tue, 18 Jan 2005 10:45:44 +0100
To: [EMAIL PROTECTED]
Subject: fixed in gcc-4.0_4.0-0pre4
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fixed in gcc-4.0_4.0-0pre4
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