JonChesterfield added a comment.

Please change the commit message to say why this change is necessary / an 
improvement on what we have now.

My recollection is that the amdgpu backend crashes on some IR and this 
decreases the probability of that IR pattern occuring, which still sounds like 
fixing the wrong place to me. Was this the one where hoisting static size 
alloca into the entry block near the backend would the problem?

I think this patch is missing a documentation update adding the new constraint 
that allocas must be contiguous in IR. That would help to answer questions 
about which alloca must be contiguous and which can occur separated by 
instructions, as currently none of them need to be adjacent. Also, is this only 
intended to constrain the entry basic block?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110257/new/

https://reviews.llvm.org/D110257

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