[Bug preprocessor/19821] New: Preprocessor oom with nested vector operations

[Bug preprocessor/19821] New: Preprocessor oom with nested vector operations

[pochini at shiny dot it]

With 4 nested vec_add()'s gcc goes out of memory on my 512MB+1GBswap ppc box. 
With 3 adds it consumes about 150MB of memory and eventually succeeds. The 
preprocessor expands the y=... line into an exagerately huge expression. fftw3 
fails to compile because of this.
Tested on gcc 3.4.1 and 3.4.3, stable versions. They were configured with the 
following options:

./configure --prefix=/usr/ --enable-shared --enable-threads=posix --with-system-
zlib --enable-__cxa_atexit --disable-checking --enable-altivec --with-cpu=7450 -
-enable-languages=c,c++,objc



#include <altivec.h>

main() {
	vector float y, a, b;

	y = vec_add(a, vec_add(a, vec_add(a, vec_add(a, b))));
}

# gcc -maltivec c.c

-- 
           Summary: Preprocessor oom with nested vector operations
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pochini at shiny dot it
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-unknown-linux-gnu
  GCC host triplet: powerpc-unknown-linux-gnu
GCC target triplet: powerpc-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19821

[Bug preprocessor/19821] Preprocessor oom with nested vector operations

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-08 13:27 -------


*** This bug has been marked as a duplicate of 19411 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19821

[Bug preprocessor/19821] Preprocessor oom with nested vector operations

[neil at daikokuya dot co dot uk]

------- Additional Comments From neil at daikokuya dot co dot uk  2005-02-08 14:02 -------
Subject: Re:  New: Preprocessor oom with nested vector operations

pochini at shiny dot it wrote:-

> With 4 nested vec_add()'s gcc goes out of memory on my 512MB+1GBswap ppc box. 
> With 3 adds it consumes about 150MB of memory and eventually succeeds. The 
> preprocessor expands the y=... line into an exagerately huge expression. fftw3 
> fails to compile because of this.

But it is ridiculously big.  If you think it's expanding it wrong then
please elaborate.  Otherwise don't use brain-dead macros 8-)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19821

[Bug preprocessor/19821] Preprocessor oom with nested vector operations

[pochini at shiny dot it]

------- Additional Comments From pochini at shiny dot it  2005-02-08 18:48 -------
Sorry for the noise, I didn't find #19411 while browsing the database.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19821