[llvm-bugs] [Bug 33524] New: Couldn't join subrange unreachable for RegisterCoalescer remat
llvm-bugs at lists.llvm.org
Tue Jun 20 02:20:12 PDT 2017
Bug ID: 33524
Summary: Couldn't join subrange unreachable for
Component: Register Allocator
Assignee: unassignedbugs at nondot.org
Reporter: david.stuttard at amd.com
CC: llvm-bugs at lists.llvm.org
Created attachment 18668
I'm seeing an issue for the AMDGCN backend (llc -march=amdgcn <testcase>.ll)
where the RegisterCoalescer hits unreachable for a SubRange join
I think I've narrowed this down to an issue in a remat (hence the name)
I've got a potential fix for this that I'll post to reviews.llvm.org (and link
I've already verified that the fix doesn't make any difference to bug 33152
which superficially seems similar.
bug 32773 may also be related
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