[PATCH] D17942: [Aarch64] Optimize test and branch sequence when the test's constant operand is power of 2

[Balaram Makam via llvm-commits]

bmakam created this revision.
bmakam added reviewers: mcrosier, t.p.northover, MatzeB, jmolloy.
bmakam added a subscriber: llvm-commits.
Herald added subscribers: mcrosier, rengolin, aemerson.

Peephole optimization that generates a single TBZ/TBNZ instruction
for test and branch sequences like in the example below. This handles
the cases that miss folding of AND into TBZ/TBNZ during ISelLowering of BR_CC

Examples:
   and  w8, w8, #0x400
   cbnz w8, L1
 to
   tbnz w8, #10, L1

http://reviews.llvm.org/D17942

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/PeepholeOptimizer.cpp
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  test/CodeGen/AArch64/aarch64-tbz.ll
  test/CodeGen/AArch64/fast-isel-tbz.ll

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