[Bug tree-optimization/21466] New: sqrt() function not vectorised

["micis at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

The following function is not vectorised while there is a sqrt vector function 
available.


#include <math.h>

void Tst1(float* __restrict__ SrcP, float* __restrict__ DstP, int Len)
{
    for (int x=0; x<Len; x++)
        DstP[x] = sqrt(SrcP[x]);
}


Compiled with
    g++41 -O -ffast-math -S TstSqrt.cpp -ftree-vectorizer-verbose=5
    -ftree-vectorize -march=opteron
gives following output:

TstSqrt.cpp:5: note: Vectorizing an unaligned access.
TstSqrt.cpp:5: note: Alignment of access forced using peeling.
TstSqrt.cpp:5: note: not vectorized: stmt not supported: D.3171_15 = 
__builtin_sqrtf (D.3170_14)
TstSqrt.cpp:3: note: vectorized 0 loops in function.


Michael Cieslinski

-- 
           Summary: sqrt() function not vectorised
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: micis at gmx dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21466