[Bug c/52932] New: AVX2 intrinsic _mm256_permutevar8x32_ps has wrong parameter type

[agner at agner dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52932

             Bug #: 52932
           Summary: AVX2 intrinsic _mm256_permutevar8x32_ps has wrong
                    parameter type
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: agner@agner.org


The intrinsic _mm256_permutevar8x32_ps in avx2intrin.h has the second parameter
of type __m256, the correct type is __m256i.

The Intel programming reference has the type __m256, which is wrong. This error
may have propagated into gnu avx2intrin.h.

The correct type is specified by Intel at
http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/2011Update/cpp/lin/intref_cls/common/intref_avx2_permutevar8x32_ps.htm

Both Intel and Microsoft immintrin.h files have the type __m256i, which appears
to be the only logically correct choice.

Excerpt from Intel version of immintrin.h:
extern __m256  __cdecl _mm256_permutevar8x32_ps(__m256, __m256i);

For the sake of compatibility with other compilers, and for logical reasons, I
would prefer __m26i.

The function works after type-casting the parameter.