[Bug c/63678] New: __mm256_blend_epi16 only accepts 8-bit masks (should accept 16-bit)

[peter.bumbulis at ianywhere dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63678

            Bug ID: 63678
           Summary: __mm256_blend_epi16 only accepts 8-bit masks (should
                    accept 16-bit)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: peter.bumbulis at ianywhere dot com

Created attachment 33844
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33844&action=edit
.i file for repro.

__mm256_blend_epi16 only accepts 8-bit masks as the 3rd parameter, not 16.  The
Intel and Microsoft compilers handle this properly.

$ gcc -c -mavx2 -save-temps foo.c 
foo.c: In function ‘blend’:
foo.c:4:46: error: the last argument must be an 8-bit immediate
  return _mm256_blend_epi16(a, b, 0xabcd);
                                              ^
where foo.c is

#include <immintrin.h>

__m256i blend(__m256i a, __m256i b) {
        return _mm256_blend_epi16(a, b, 0xabcd);
}

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)