commit a587557962e93552e1a8b9270b435b021891e9cd
author Heejin Ahn <aheejin@gmail.com> Tue Jun 19 20:30:42 2018 +0000
committer Heejin Ahn <aheejin@gmail.com> Tue Jun 19 20:30:42 2018 +0000
tree 3197aa78c58a3e6806ed25dcb2fcf8d69cc7b2ab
parent c57aba1e3b6f9106a894f60e41a70794aed62891

[WebAssembly] Fix liveness tracking info after drop insertion

Summary:
This fixes liveness tracking information after `drop` instruction
insertion in ExplicitLocals pass.

When a drop instruction is inserted to drop a dead register operand, the
original operand should be marked not dead anymore because it is now
used by the new drop instruction. And the operand to the new drop
instruction should be marked killed instead. This bug caused some
programs to fail when `llc` is run with `-verify-machineinstrs` option.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D48253

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335074 91177308-0d34-0410-b5e6-96231b3b80d8