[PATCH] D18572: [AArch64] Relax branches by fusing compare with conditional branch when we can infer that source register is zero/non-zero.

[Balaram Makam via llvm-commits]

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

    eg..:
            tbnz    x8, #63, .LBB0_5
            cmp             x8, #1
            b.lt    .LBB0_2
    ->to:
            tbnz    x8, #63, .LBB0_5
            cbz     .LBB0_2


http://reviews.llvm.org/D18572

Files:
  lib/Target/AArch64/AArch64BranchRelaxation.cpp
  test/CodeGen/AArch64/branch-relax-fuse-cbz.ll

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