[PATCH] D25722: Improved cost model for FDIV and FSQRT
Michael Kuperstein via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 25 10:27:01 PDT 2016
mkuper added a comment.
In https://reviews.llvm.org/D25722#578473, @RKSimon wrote:
> I'm swaying toward using Agner's numbers for SandyBridge FDIV / FSQRT costs - would anyone have any objections?
I'd really like to understand the discrepancy between Agner's numbers and the IACA numbers - especially since IACA does give the expected number for the latency.
Andrew, any chance you could ping the IACA people at Intel and ask them about this?
Meanwhile, I think I'd also prefer this to go in with Agner's numbers - and change it to the IACA numbers later if it turns out it's accounting for something real.
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