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Couldn't join subrange unreachable for RegisterCoalescer remat #32871

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dstutt opened this issue Jun 20, 2017 · 3 comments
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Couldn't join subrange unreachable for RegisterCoalescer remat #32871

dstutt opened this issue Jun 20, 2017 · 3 comments
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bugzilla Issues migrated from bugzilla llvm:regalloc

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@dstutt
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dstutt commented Jun 20, 2017

Bugzilla Link 33524
Resolution FIXED
Resolved on Jul 06, 2017 10:10
Version trunk
OS All
Attachments Test case
CC @arsenm

Extended Description

I'm seeing an issue for the AMDGCN backend (llc -march=amdgcn .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 from here)

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
@dstutt
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dstutt commented Jun 20, 2017

See https://reviews.llvm.org/D34391 for a potential fix

@arsenm
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arsenm commented Jun 20, 2017

Possibly the same as bug 33152

@dstutt
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dstutt commented Jul 6, 2017

https://reviews.llvm.org/D34391 now submitted

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
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bugzilla Issues migrated from bugzilla llvm:regalloc
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@arsenm @dstutt