How does one link the optimized math library?
I have a simple C program calling pow() [see below], what is the proper way to compile in the optimized math library? The following do not work (can't find pow()):
% cc -fast -xarch=generic -o tmp tmp.c
nor
% cc -fast -xarch=generic -o tmp tmp.c -lmopt
(whereas if I compile with -lm, it does work, however I do not believe that is the optimized
library).
Thanks! Jordan
#include <stdio.h>
#include <math.h>
int
main()
{
fprintf(stderr, "Fubar=%d\n", pow(5.0, 3.2));
}
[567 byte] By [
jslott] at [2007-11-26 9:36:01]
# 1
I believe with both of the cases below, you are getting the optimized pow() routine
from libmopt.
Just one of the things that the -fast option expands to is -xlibmopt. So your 2 compilation
lines are really the same.
Also, libmopt in Studio 11 is available only as a static library, libmopt.a. So this would
not show up when doing an ldd on your executable. See the Numerical Computation
Guide at :
http://docs.sun.com/app/docs/doc/819-3693?a=load
Section 3.2.2
You can verify this by starting your test case in dbx and then do :
% stop in __pow
% run
% whereis __pow
And you will get back `tmp`__pow
This means it used the __pow routine from the static libmopt and put it into the tmp exe.
Also, depending on how you use pow(), you may also want to look at the vectorized
pow() routine in libmvec.
# 2
Thanks for the reply! I suspected both of those compile lines were equivalent -- however,
neither of them work, as we see below. I thought that with -fast including -xlibmopt, that
would take care of it (Note: when I link -lm, it then works).
% cc -fast -xarch=generic -o tmp tmp.c
Undefinedfirst referenced
symbolin file
pow tmp.o
ld: fatal: Symbol referencing errors. No output written to tmp
%
What am I missing?
Thanks, Jordan
# 3
Using Studio 11 on my SPARC system works :
% cc -V
cc: Sun C 5.8 2005/10/13
% cc -fast -xarch=generic -o tmp tmp.c
% ldd tmp
libc.so.1 =>/lib/libc.so.1
libm.so.2 =>/lib/libm.so.2
/platform/SUNW,Sun-Blade-2500/lib/libc_psr.so.1
Which version of Studio are you running? You can get this information by :
% version
Machine hardware:sun4u
OS version: 5.10
Processor type:sparc
Hardware:SUNW,Sun-Blade-2500
The following components are installed on your system:
Sun Studio 11
Sun Studio 11 C Compiler
Sun Studio 11 C++ Compiler
Sun Studio 11 Tools.h++ 7.1
Sun Studio 11 C++ Standard 64-bit Class Library
Sun Studio 11 Garbage Collector
Sun Studio 11 Fortran 95
Sun Studio 11 Debugging Tools (including dbx)
Sun Studio 11 IDE
Sun Studio 11 Debugger GUI
Sun Studio 11 Performance Analyzer (including collect, ...)
Sun Studio 11 X-Designer
Sun Studio 11 VIM editor
Sun Studio 11 XEmacs editor
Sun Studio 11 Native Connector Tool
Sun Studio 11 Performance Library
Sun Studio 11 LockLint
Sun Studio 11 Building Software (including dmake)
Sun Studio 11 Documentation Set
And are you on SPARC or Opteron platform?
# 4
Yeah, Opteron... huh, my installation seems to be the same as yours.
% cc -V
cc: Sun C 5.8 2005/10/13
% version
Machine hardware:i86pc
OS version: 5.10
Processor type:i386
Hardware:i86pc
The following components are installed on your system:
Sun Studio 11
Sun Studio 11 C Compiler
Sun Studio 11 C++ Compiler
Sun Studio 11 Tools.h++ 7.1
Sun Studio 11 C++ Standard 64-bit Class Library
Sun Studio 11 Garbage Collector
Sun Studio 11 Fortran 95
Sun Studio 11 Debugging Tools (including dbx)
Sun Studio 11 IDE
Sun Studio 11 Debugger GUI
Sun Studio 11 Performance Analyzer (including collect, ...)
Sun Studio 11 X-Designer
Sun Studio 11 VIM editor
Sun Studio 11 XEmacs editor
Sun Studio 11 Native Connector Tool
Sun Studio 11 Performance Library
Sun Studio 11 Building Software (including dmake)
Sun Studio 11 Documentation Set
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/cc": Sun C 5.8 2005/10/13
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/CC": Sun C++ 5.8 2005/10/13
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/f90": Sun Fortran 95 8.2 2005/10/13
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/dbx": Sun Dbx Debugger 7.5 2005/10/13
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/analyzer": Sun Performance Analyzer 7.5 2005/10/13
version of "/opt/SUNWspro/bin/../prod/bin/../../bin/dmake": Sun Distributed Make 7.7 2005/10/13
