[llvm] r289372 - [X86][InstCombine] Teach InstCombineCalls to simplify demanded elements for scalar FMA intrinsics.

[Chandler Carruth via llvm-commits]

No test case?

On Sat, Dec 10, 2016 at 11:52 PM Craig Topper via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: ctopper
> Date: Sun Dec 11 01:42:06 2016
> New Revision: 289372
>
> URL: http://llvm.org/viewvc/llvm-project?rev=289372&view=rev
> Log:
> [X86][InstCombine] Teach InstCombineCalls to simplify demanded elements
> for scalar FMA intrinsics.
>
> These intrinsics don't read the upper bits of their second and third
> inputs so we can try to simplify them.
>
> Modified:
>     llvm/trunk/lib/Transforms/InstCombine/InstCombineCalls.cpp
>
> Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineCalls.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineCalls.cpp?rev=289372&r1=289371&r2=289372&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Transforms/InstCombine/InstCombineCalls.cpp (original)
> +++ llvm/trunk/lib/Transforms/InstCombine/InstCombineCalls.cpp Sun Dec 11
> 01:42:06 2016
> @@ -1777,6 +1777,14 @@ Instruction *InstCombiner::visitCallInst
>      break;
>    }
>
> +  case Intrinsic::x86_fma_vfmadd_ss:
> +  case Intrinsic::x86_fma_vfmsub_ss:
> +  case Intrinsic::x86_fma_vfnmadd_ss:
> +  case Intrinsic::x86_fma_vfnmsub_ss:
> +  case Intrinsic::x86_fma_vfmadd_sd:
> +  case Intrinsic::x86_fma_vfmsub_sd:
> +  case Intrinsic::x86_fma_vfnmadd_sd:
> +  case Intrinsic::x86_fma_vfnmsub_sd:
>    case Intrinsic::x86_avx512_mask_add_ss_round:
>    case Intrinsic::x86_avx512_mask_div_ss_round:
>    case Intrinsic::x86_avx512_mask_mul_ss_round:
>
>
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