[PATCH] D99980: [SLP]Improve cost model for the vectorized extractelements.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added inline comments.


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Comment at: llvm/test/Transforms/SLPVectorizer/X86/extractelement.ll:53
+; THRESH1-NEXT:    [[TMP4:%.*]] = extractelement <2 x float> [[TMP2]], i32 1
+; THRESH1-NEXT:    [[ADD:%.*]] = fadd float [[TMP3]], [[TMP4]]
 ; THRESH1-NEXT:    store float [[ADD]], float* @a, align 4
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RKSimon wrote:
> Missed fadd reduction opportunity
We even do not try to detect reductions if we have less than 4 elements, here we're going to have shuffle + vector fadd + extractelement.


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  https://reviews.llvm.org/D99980/new/

https://reviews.llvm.org/D99980