[PATCH] D109953: [X86] Combine the FADD(A, FMA(B, C, 0)) to FMA(B, C, A)

[LiuChen via Phabricator via llvm-commits]

LiuChen3 added inline comments.


================
Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:47514-47517
+        DAG.getNode(Opcode == X86ISD::VFMADDC ? X86ISD::VFMULC
+                                              : X86ISD::VFCMULC,
+                    SDLoc(Op0), Op0.getSimpleValueType(), Op0->getOperand(1),
+                    Op0->getOperand(2));
----------------
pengfei wrote:
> Why we still need this?
We need transfer FMA(A, B 0) to MUL(A, B) firstly.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D109953/new/

https://reviews.llvm.org/D109953