[all-commits] [llvm/llvm-project] 9de124: [PowerPC][Future] Branch Distance Estimation For P...

[stefanp-ibm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9de1241bb2dd1b0e39bb695c701f2d299776ff6b
      https://github.com/llvm/llvm-project/commit/9de1241bb2dd1b0e39bb695c701f2d299776ff6b
  Author: Stefan Pintilie <stefanp at ca.ibm.com>
  Date:   2020-01-30 (Thu, 30 Jan 2020)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCBranchSelector.cpp
    A llvm/test/CodeGen/PowerPC/alignlongjumptest.mir

  Log Message:
  -----------
  [PowerPC][Future] Branch Distance Estimation For Prefixed Instructions

By adding the prefixed instructions the branch distances are no longer
computed correctly. Since prefixed instructions cannot cross a 64 byte
boundary we have to assume that a prefixed instruction may have a nop
prepended to it. This patch tries to take that nop into consideration
when computing the size of basic blocks.

Differential Revision: https://reviews.llvm.org/D72572