Vectorizing my loops. Some problems.

[Øystein Johansen <oystein at gnubg dot org>]

Hi,

I just started to work on some loop vectorizing for my project. Some 
weeks ago I got a snapshot of GCC-4.1-20050313. It compiled my code but 
I was not able to get the auto-vectorization working. (Yes, I understand 
why)

I decided to try sse intrinsics (X86 Built-in Functions as the manual 
says) instead of auto-vectorization.

I wrote some lines:

typedef int v4sf __attribute__ ((mode(V4SF)));

typedef union _vec4f {
  v4sf v;
  float f[4];
} vec4f;

Blah bla

       for( j = 32; j ; j--, prW += 4, pr += 4 ){
         vec0 = __builtin_ia32_loadups(pr);
         vec1 = __builtin_ia32_loadups(prW);
         vec3 = __builtin_ia32_mulps(vec0, vec1);
         sum.v = __builtin_ia32_addps(sum.v, vec3);
       }

and this works fine when I compile with GCC 3.4.2

However... If I try to compile this with the GCC 4.1 snapshot I get 
errors and warnings:

/msys/1.0/local/bin/gcc.exe -O3 -msse -Wall -DHAVE_CONFIG_H  -I. -I.. 
-c -o neuralnet.o neuralnet.c
neuralnet.c:447: warning: specifying vector types with __attribute__ 
((mode)) is deprecated
neuralnet.c:447: warning: use __attribute__ ((vector_size)) instead
neuralnet.c:447: error: mode 'V4SF' applied to inappropriate type
neuralnet.c: In function 'Evaluate':
neuralnet.c:510: error: incompatible type for argument 1 of 
'__builtin_ia32_xorps'
neuralnet.c:510: error: incompatible type for argument 2 of 
'__builtin_ia32_xorps'
neuralnet.c:510: error: incompatible types in assignment
neuralnet.c:512: error: incompatible types in assignment
neuralnet.c:513: error: incompatible types in assignment
neuralnet.c:514: error: incompatible type for argument 1 of 
'__builtin_ia32_mulps'
neuralnet.c:514: error: incompatible type for argument 2 of 
'__builtin_ia32_mulps'
neuralnet.c:514: error: incompatible types in assignment
neuralnet.c:515: error: incompatible type for argument 1 of 
'__builtin_ia32_addps'
neuralnet.c:515: error: incompatible type for argument 2 of 
'__builtin_ia32_addps'
neuralnet.c:515: error: incompatible types in assignment
make: *** [neuralnet.o] Error 1

So... from when was __attribute__ ((mode)) deprecated? How do I declear 
the v4sf vector type?

Will the right declaration of v4sf type fix the incompatible type in 
assignment and argument problems?

Thanks for any help!
-Øystein