[all-commits] [llvm/llvm-project] 597718: Re-land "Avoid emitting unreachable SP adjustments...

[Reid Kleckner via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 597718aae017a870e99cdb37b3bc10d8dfa58a25
      https://github.com/llvm/llvm-project/commit/597718aae017a870e99cdb37b3bc10d8dfa58a25
  Author: Reid Kleckner <rnk at google.com>
  Date:   2020-03-24 (Tue, 24 Mar 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86FrameLowering.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/noreturn-call-win64.ll

  Log Message:
  -----------
  Re-land "Avoid emitting unreachable SP adjustments after `throw`"

This reverts commit 4e0fe038f438ae1679eae9e156e1f248595b2373. Re-lands
65b21282c710afe9c275778820c6e3c1cf46734b.

After landing 5ff5ddd0adc89f8827b345577bbb3e7eb74fc644 to add int3 into
trailing unreachable blocks, we can now remove these extra stack
adjustments without confusing the Win64 unwinder. See
https://llvm.org/45064#c4 or X86AvoidTrailingCall.cpp for a full
explanation.

Fixes PR45064.