[PATCH][AVX512][PR96246] Merge two define_insn: <avx512>_blendm<mode>, <avx512>_load<mode>_mask.

[Hongtao Liu]

  Those two define_insns have same pattern, and
<avx512>_load<mode>_mask would always be matched since it show up
earlier in the md file, and it may lose some opportunity in
pass_reload since <avx512>_load<mode>_mask only have constraint "0C"
for operand2, and "v" constraint in <avx512>_vblendm<mode> would never
be matched.

2020-07-21  Hongtao Liu  <hongtao.liu@intel.com>

gcc/
       PR target/96246
        * config/i386/sse.md (<avx512>_load<mode>_mask,
        <avx512>_load<mode>_mask): Extend to generate blendm
        instructions.
        (<avx512>_blendm<mode>, <avx512>_blendm<mode>): Change
        define_insn to define_expand.

gcc/testsuite/
        * gcc.target/i386/avx512bw-pr96246-1.c: New test.
        * gcc.target/i386/avx512bw-pr96246-2.c: New test.
        * gcc.target/i386/avx512vl-pr96246-1.c: New test.
        * gcc.target/i386/avx512vl-pr96246-2.c: New test.
        * gcc.target/i386/avx512bw-vmovdqu16-1.c: New test.
        * gcc.target/i386/avx512bw-vmovdqu8-1.c: New test.
        * gcc.target/i386/avx512f-vmovapd-1.c: New test.
        * gcc.target/i386/avx512f-vmovaps-1.c: New test.
        * gcc.target/i386/avx512f-vmovdqa32-1.c: New test.
        * gcc.target/i386/avx512f-vmovdqa64-1.c: New test.
        * gcc.target/i386/avx512vl-pr92686-movcc-1.c: New test.
        * gcc.target/i386/avx512vl-pr96246-1.c: New test.
        * gcc.target/i386/avx512vl-pr96246-2.c: New test.
        * gcc.target/i386/avx512vl-vmovapd-1.c: New test.
        * gcc.target/i386/avx512vl-vmovaps-1.c: New test.
        * gcc.target/i386/avx512vl-vmovdqa32-1.c: New test.
        * gcc.target/i386/avx512vl-vmovdqa64-1.c: New test.


-- 
BR,
Hongtao
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