[all-commits] [llvm/llvm-project] c2dccf: [CodeGenPrepare] Reset the debug location when pro...

[Davide Italiano via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: c2dccf9d5e34278cb2ed0a018405848850508b99
      https://github.com/llvm/llvm-project/commit/c2dccf9d5e34278cb2ed0a018405848850508b99
  Author: Davide Italiano <ditaliano at apple.com>
  Date:   2020-06-15 (Mon, 15 Jun 2020)

  Changed paths:
    M llvm/lib/CodeGen/CodeGenPrepare.cpp
    A llvm/test/Transforms/CodeGenPrepare/X86/promoted-trunc-loc.ll

  Log Message:
  -----------
  [CodeGenPrepare] Reset the debug location when promoting trunc(s)

The promotion machinery in CGP moves instructions retaining
debug locations. When the transformation is local, this is mostly
correct, but when instructions are moved cross-BBs, this is not
always true and causes jumpiness in line tables. This is the first
of a series of commits. sext(s) and zext(s) need to be treated
similarly.

Differential Revision:  https://reviews.llvm.org/D81879