[PATCH] D46637: [TTI] Add uniform/non-uniform constant Pow2 detection to TargetTransformInfo::getInstructionThroughput

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: ABataev, fhahn, mkuper, craig.topper, spatel.

This enables us to detect more fast path sdiv cases under cost analysis (only LV currently use pow2 and only for uniform constants).

This patch also enables us to handle non-uniform-constant pow2 cases for X86 SDIV costs.

Found while working on https://reviews.llvm.org/D46276


Repository:
  rL LLVM

https://reviews.llvm.org/D46637

Files:
  lib/Analysis/TargetTransformInfo.cpp
  lib/Target/X86/X86TargetTransformInfo.cpp
  test/Analysis/CostModel/X86/div.ll

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