[mips] Fix atomic operations at O0, v3
Similar to PR/25526, fast-regalloc introduces spills at the end of basic
blocks. When this occurs in between an ll and sc, the stores can cause the
atomic sequence to fail.
This patch fixes the issue by introducing more pseudos to represent atomic
operations and moving their lowering to after the expansion of postRA
pseudos.
This version addresses issues with the initial implementation and covers
all atomic operations.
This resolves PR/32020.
Thanks to James Cowgill for reporting the issue!
Patch By: Simon Dardis
Differential Revision: https://reviews.llvm.org/D31287
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336328 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed