gcc 3.4.4 assembly problem

gcc 3.4.4 assembly problem

[Joerg Sonnenberger]

[-- Attachment #1: Type: text/plain, Size: 496 bytes --]

Hi all,
I'm running into a problem with GCC 3.4.4 when building mplayer.
Test case and assembly is attached. Can others confirm this behaviour?
Any other workaround than inlining the second constraint?

The difference with GCC 3.4.3 is that it doesn't put the memory operator
into a register, which is perfectly fine.

Joerg

Using built-in specs.
Configured with: ./configure --prefix=/usr --host=i386-just-dragonflybsd
Thread model: posix
gcc version 3.4.4 [DragonFly] (propolice, visibility)


[-- Attachment #2: tabinit_MMX.c --]
[-- Type: text/plain, Size: 167 bytes --]

extern float mp3lib_decwin[];

void make_decode_tables_MMX(long scaleval)
{
    __asm __volatile(
	"fsts  %0(,%%ecx,4)\n\t"
	::"m"(mp3lib_decwin[0]),"m"(scaleval));
}

[-- Attachment #3: tabinit_MMX.s --]
[-- Type: text/plain, Size: 333 bytes --]

	.file	"tabinit_MMX.c"
	.text
	.p2align 2,,3
.globl make_decode_tables_MMX
	.type	make_decode_tables_MMX, @function
make_decode_tables_MMX:
	movl	4(%esp), %edx
	movl	%edx, 4(%esp)
	movl	$mp3lib_decwin, %eax
#APP
	fsts  (%eax)(,%ecx,4)
	
#NO_APP
	ret
	.size	make_decode_tables_MMX, .-make_decode_tables_MMX
	.ident	"GCC: (GNU) 3.4.4"

cmath isnan function

[Wesley Smith]

Hi,

I'm trying to compile a test program to see about the isnan function
on my system (apple darwin w/ gcc version 3.3 20030304 (Apple
Computer, Inc. build 1671).  Here's the code:

#include <cmath>
int main()
{
 float x=sqrt(-1);
 return isnan(x);
}

Here's the output:

gcc -o main main.cpp
main.cpp: In function `int main()':
main.cpp:5: error: `isnan' undeclared (first use this function)
main.cpp:5: error: (Each undeclared identifier is reported only once for each 
   function it appears in.)

This is baffling since cmath is included and it redifines the macros
which it includes from math.h.  I completely stumped here and would
appreciate any help.

thanks,
wes

Re: cmath isnan function

[Brian Budge]

You need to be using the namespace std.

On 5/21/05, Wesley Smith <wesley.hoke@gmail.com> wrote:
> Hi,
> 
> I'm trying to compile a test program to see about the isnan function
> on my system (apple darwin w/ gcc version 3.3 20030304 (Apple
> Computer, Inc. build 1671).  Here's the code:
> 
> #include <cmath>
> int main()
> {
>  float x=sqrt(-1);
>  return isnan(x);
> }
> 
> Here's the output:
> 
> gcc -o main main.cpp
> main.cpp: In function `int main()':
> main.cpp:5: error: `isnan' undeclared (first use this function)
> main.cpp:5: error: (Each undeclared identifier is reported only once for each
>   function it appears in.)
> 
> This is baffling since cmath is included and it redifines the macros
> which it includes from math.h.  I completely stumped here and would
> appreciate any help.
> 
> thanks,
> wes
>

Re: cmath isnan function

[Wesley Smith]

I tried:

using namespace std;

before everything and it still failed to find isnan.

wes

On 5/22/05, Brian Budge <brian.budge@gmail.com> wrote:
> You need to be using the namespace std.
> 
> On 5/21/05, Wesley Smith <wesley.hoke@gmail.com> wrote:
> > Hi,
> >
> > I'm trying to compile a test program to see about the isnan function
> > on my system (apple darwin w/ gcc version 3.3 20030304 (Apple
> > Computer, Inc. build 1671).  Here's the code:
> >
> > #include <cmath>
> > int main()
> > {
> >  float x=sqrt(-1);
> >  return isnan(x);
> > }
> >
> > Here's the output:
> >
> > gcc -o main main.cpp
> > main.cpp: In function `int main()':
> > main.cpp:5: error: `isnan' undeclared (first use this function)
> > main.cpp:5: error: (Each undeclared identifier is reported only once for each
> >   function it appears in.)
> >
> > This is baffling since cmath is included and it redifines the macros
> > which it includes from math.h.  I completely stumped here and would
> > appreciate any help.
> >
> > thanks,
> > wes
> >
>

Re: cmath isnan function

[Wesley Smith]

Ok,

So the following works:

using namespace std;
 #include <math.h>
int main()
{
  float x=sqrt(-1);
  return isnan(x);
}

but when I include cmath, it doesn't.  It seems that cmath is
overidding the math.h isnan macro and not redifining it.  Has anyone
else had this problem?  Is there a way to fix this?

thanks,
wes

On 5/22/05, Wesley Smith <wesley.hoke@gmail.com> wrote:
> I tried:
> 
> using namespace std;
> 
> before everything and it still failed to find isnan.
> 
> wes
> 
> On 5/22/05, Brian Budge <brian.budge@gmail.com> wrote:
> > You need to be using the namespace std.
> >
> > On 5/21/05, Wesley Smith <wesley.hoke@gmail.com> wrote:
> > > Hi,
> > >
> > > I'm trying to compile a test program to see about the isnan function
> > > on my system (apple darwin w/ gcc version 3.3 20030304 (Apple
> > > Computer, Inc. build 1671).  Here's the code:
> > >
> > > #include <cmath>
> > > int main()
> > > {
> > >  float x=sqrt(-1);
> > >  return isnan(x);
> > > }
> > >
> > > Here's the output:
> > >
> > > gcc -o main main.cpp
> > > main.cpp: In function `int main()':
> > > main.cpp:5: error: `isnan' undeclared (first use this function)
> > > main.cpp:5: error: (Each undeclared identifier is reported only once for each
> > >   function it appears in.)
> > >
> > > This is baffling since cmath is included and it redifines the macros
> > > which it includes from math.h.  I completely stumped here and would
> > > appreciate any help.
> > >
> > > thanks,
> > > wes
> > >
> >
>