[PATCH] D109295: [X86] Handle inverted inputs when matching VPTERNLOG from 2 binary ops.

[LuoYuanke via Phabricator via llvm-commits]

LuoYuanke added a comment.

> I meant simplified from current generation:
>
>   vpcmpeqd        %ymm3, %ymm3, %ymm3
>   vpternlogq      $222, %ymm2, %ymm1, %ymm3
>   vpternlogq      $200, %ymm1, %ymm3, %ymm0
>   retq
>
> We can save one vpternlogq.

I think we may have another algorithm which iterate 8 possible composition of 3 bits and calculate the result with multi-operates and get the immediate operand of VPTERNLOGD.

VPTERNLOGD reg1, reg2, src3
Bit(reg1)	Bit(reg2)	Bit(src3)
0	0	0
0	0	1
0	1	0
0	1	1
1	0	0
1	0	1
1	1	0
1	1	1


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D109295/new/

https://reviews.llvm.org/D109295