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Invalid CSE for arrays in constants #2021

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athas opened this issue Sep 18, 2023 · 0 comments
Closed

Invalid CSE for arrays in constants #2021

athas opened this issue Sep 18, 2023 · 0 comments
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bug compiler

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@athas
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athas commented Sep 18, 2023 

def arr = replicate 10 true
entry main = zip arr arr

Causes compiler crash. Probably we should just not CSE arrays in constants - it's unlikely to be useful very often, and the aliasing implications are subtle.
@athas athas closed this as completed in af76f4a Sep 18, 2023
CKuke pushed a commit to CKuke/futhark-seq that referenced this issue Nov 8, 2023
@athas @CKuke
Fix diku-dk#2021.
faa0a86 
This bug turned out to manifest itself in many locations, but all
related to copy-removal in top level statements.

It is somewhat annoying that we have to be so careful about aliasing,
since I expect few real programs actually use in-place updates all
that much.
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