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Jul 4, 2008, 4:38 PM
Post #23 of 27
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[issue3168] cmath test fails on Solaris 10
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Jean Brouwers <MrJean1[at]Gmail.com> added the comment:
Below is the reply from SUN. It was indeed a bug which has been fixed already.
I have not yet applied the patches to my SUN compilers and tried again.
/Jean
Begin forwarded message:
From: Sun Microsystems <IncidentUpdateDaemon[at]sun.com>
Date: July 1, 2008 3:51:17 PM PDT
Subject: Re: (Incident Review ID: 1284413) Sun C 5.8 optimization bug for 64-bit Opteron
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Hi Jean Brouwers,
We appreciate your feedback. Using your sample I was able to get the correct results using Sun
Studio 12. This may indicate that the issue was also fixed in a backported patch to Studio 11 (Sun
C 5.8). Check to be sure that the latest patches have been applied to your installation. See:
<http://developers.sun.com/sunstudio/downloads/patches/ss11_patches.html>
Regards,
Brad Mayer
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--------------- Previous Messages ----------------
--------------------- Report ---------------------
category : c
subcategory : compiler
release : other
type : bug
synopsis : Sun C 5.8 optimization bug for 64-bit Opteron
customer name : Jean Brouwers
sdn id :
language : en
hardware : x86
os : sol2.5.1
bug id : 0
date created : Sun Jun 29 11:49:10 MST 2008
date evaluated : Tue Jul 01 15:41:10 MST 2008
description :
FULL PRODUCT VERSION :
which cc
/opt/SUNWspro/bin/cc
cc -V
cc: Sun C 5.8 2005/10/13
ADDITIONAL OS VERSION INFORMATION :
uname -a
SunOS unknown 5.10 Generic_118855-14 i86pc i386 i86pc
EXTRA RELEVANT SYSTEM CONFIGURATION :
Solaris 10 on an Ultra20 Opteron machine.
A DESCRIPTION OF THE PROBLEM :
At higher optimization levels, the Sun C compiler does not handle certain function call patterns
correctly. Specifically, the values of complex_t variables q and r in the code snippet below are
different.
typedef struct {
double real;
double imag;
} complex_t;
complex_t c_comp(double real);
complex_t c_quot(complex_t a, complex_t b);
...
complex_t_t x, y, q, r;
x = c_comp(4.6051701859880918);
y = c_comp(0.69314718055994529);
q = c_quot(x, y);
r = c_quot(x, c_comp(0.6931471805599452));
...
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See the attached test case. Instructions are included inside.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
rm a.out ; cc -xtarget=native64 -xO0 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
6.643856 + j 0.000000
ACTUAL -
rm a.out ; cc -xtarget=native64 -xO3 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
Inf + j 0.000000
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
/* Split this file in 3 separate file, c_main.c, c_quot.h and
c_quot.c. Compile with and without optimization using Sun
C 5.8 compiler on Solaris 10 (Opteron) and run as follows.
rm a.out ; cc -xtarget=native64 -xO0 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
6.643856 + j 0.000000
rm a.out ; cc -xtarget=native64 -xO1 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
6.643856 + j 0.000000
rm a.out ; cc -xtarget=native64 -xO2 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
6.643856 + j 0.000000
rm a.out ; cc -xtarget=native64 -xO3 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
Inf + j 0.000000
rm a.out ; cc -xtarget=native64 -xO4 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
Inf + j 0.000000
rm a.out ; cc -xtarget=native64 -xO5 c_main.c c_quot.c -lm ; ./a.out
c_main.c:
c_quot.c:
6.643856 + j 0.000000
Inf + j 0.000000
*/
------------------ save as c_main.c -----------------
#include <stdio.h>
#include "c_quot.h"
int main(int argc, char* argv[])
{
complex_t x, y, q, r;
x = c_comp(4.6051701859880918);
y = c_comp(0.69314718055994529);
q = c_quot(x, y);
/* expect: 6.643856 + j 0.000000 */
printf("%f + j %f\n", q.real, q.imag);
x = c_comp(4.6051701859880918);
y = c_comp(0.69314718055994529);
r = c_quot(x, c_comp(0.6931471805599452));
/* expect: 6.643856 + j 0.000000, but ... */
printf("%f + j %f\n", r.real, r.imag);
}
------------------ save as c_quot.h -----------------
typedef struct {
double real;
double imag;
} complex_t;
complex_t c_comp(double real);
complex_t c_quot(complex_t a, complex_t b);
------------------ save as c_quot.c -----------------
#include "c_quot.h"
complex_t
c_comp(double real)
{
complex_t c;
c.real = real;
c.imag = 0.0; /* ignore imag */
return c;
}
complex_t
c_quot(complex_t a, complex_t b)
{
complex_t r;
r.real = a.real / b.real;
r.imag = 0.0; /* ignore imag */
return r;
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Compiling with -xO... less than 3 avoids the problem.
_______________________________________
Python tracker <report[at]bugs.python.org>
<http://bugs.python.org/issue3168>
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