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[X86] Prefer rotate by 1 over rotate by imm
authorZvi Rackover <zvi.rackover@intel.com>
Mon, 10 Oct 2016 14:43:55 +0000 (14:43 +0000)
committerZvi Rackover <zvi.rackover@intel.com>
Mon, 10 Oct 2016 14:43:55 +0000 (14:43 +0000)
commitbca70faf12936bae4a856c635d665f7051d2ba5a
tree2fa7404ac7a750932011dd28275fe583f9d238b5tree | snapshot
parent5ba17d7d92da9e89c5047aacf993ba8ebc3508a0commit | diff
[X86] Prefer rotate by 1 over rotate by imm

Summary:
Rotate by 1 is translated to 1 micro-op, while rotate with imm8 is translated to 2 micro-ops.

Fixes pr30644.

Reviewers: delena, igorb, craig.topper, spatel, RKSimon

Differential Revision: https://reviews.llvm.org/D25399

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283758 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/X86/X86InstrShiftRotate.td diff | blob | history
test/CodeGen/X86/rotate.ll diff | blob | history
external/llvm
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