[PATCH] D28307: Add Instruction number to LSR cost model (PR23384) part 1 of 3

[Evgeny Stupachenko via Phabricator via llvm-commits]

evstupac created this revision.
evstupac added a reviewer: qcolombet.
evstupac added subscribers: llvm-commits, wmi.
evstupac set the repository for this revision to rL LLVM.
Herald added subscribers: mehdi_amini, mzolotukhin.

Fix PR23384.
The patch adds instructions number generated by a solution to LSR cost under "-lsr-insns-cost" option.
Performance improvement on x86:
spec2000

177.mesa on -O2 +3%
256.bzip2 on -Ofast -flto +1.5%


Repository:
  rL LLVM

https://reviews.llvm.org/D28307

Files:
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Transforms/LoopStrengthReduce/X86/lsr-insns-1.ll
  test/Transforms/LoopStrengthReduce/X86/lsr-insns-2.ll

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