[all-commits] [llvm/llvm-project] 9e5019: [WebAssembly] Undef invalid DBG_VALUEs after RegCo...

[Heejin Ahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9e501945ca4ec3f8dbe6992f155426f7390caa3c
      https://github.com/llvm/llvm-project/commit/9e501945ca4ec3f8dbe6992f155426f7390caa3c
  Author: Heejin Ahn <aheejin at gmail.com>
  Date:   2023-06-08 (Thu, 08 Jun 2023)

  Changed paths:
    M llvm/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp
    A llvm/test/DebugInfo/WebAssembly/dbg-value-reg-coloring.mir

  Log Message:
  -----------
  [WebAssembly] Undef invalid DBG_VALUEs after RegColoring

After register coalescing, some `DBG_VALUE`s can have incorrect info.
For example, if a `DBG_VALUE` has a register operand `%0`, but it
resides in a live range of `%1`, it has incorrect info after `%0` and
`%1` are coalesced. See the comments for more details.

This does not have meaningful changes on our variable debug info
coverage or compilation time, which is good news.

Reviewed By: dschuff

Differential Revision: https://reviews.llvm.org/D151125