gcc/testsuite/gcc.dg/vect/pr88497-2.c

/* { dg-do compile } */
/* { dg-require-effective-target vect_float } */
/* { dg-require-effective-target powerpc_altivec_ok { target { powerpc*-*-* } } } */
/* { dg-require-effective-target sse2 { target { i?86-*-* x86_64-*-* } } } */
/* { dg-options "-O2 -ffast-math -fdump-tree-reassoc1" } */
/* { dg-additional-options "-maltivec" { target { powerpc*-*-* } } } */
/* { dg-additional-options "-msse2" { target { i?86-*-* x86_64-*-* } } } */

/* To test reassoc can undistribute vector bit_field_ref on multiplication.

   v1, v2, v3, v4 of type vector float.

   reassoc transforms

     accumulator *= v1[0] * v1[1] * v1[2] * v1[3] *
                    v2[0] * v2[1] * v2[2] * v2[3] *
                    v3[0] * v3[1] * v3[2] * v3[3] *
                    v4[0] * v4[1] * v4[2] * v4[3] ;

   into:

     T = v1 * v2 * v3 * v4;
     accumulator *= T[0] * T[1] * T[2] * T[3];

   Fewer bit_field_refs, only four for 128 or more bits vector.  */

typedef float v4sf __attribute__ ((vector_size (16)));
float
test (float accumulator, v4sf v1, v4sf v2, v4sf v3, v4sf v4)
{
  accumulator *= v1[0] * v1[1] * v1[2] * v1[3];
  accumulator *= v2[0] * v2[1] * v2[2] * v2[3];
  accumulator *= v3[0] * v3[1] * v3[2] * v3[3];
  accumulator *= v4[0] * v4[1] * v4[2] * v4[3];
  return accumulator;
}
/* { dg-final { scan-tree-dump-times "BIT_FIELD_REF" 4 "reassoc1" { target { powerpc*-*-* i?86-*-* x86_64-*-* } } } } */