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r312791 causes SLP vectorizer to miscompile signed int min reductions #33983

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chandlerc opened this issue Sep 15, 2017 · 2 comments
Closed

r312791 causes SLP vectorizer to miscompile signed int min reductions #33983

chandlerc opened this issue Sep 15, 2017 · 2 comments
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@chandlerc
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Bugzilla Link 34635
Resolution FIXED
Resolved on Dec 15, 2018 05:59
Version trunk
OS All
Attachments test case
CC @alexey-bataev,@RKSimon
Fixed by commit(s) rL347759

Extended Description

Test case attached. To reproduce:

% llc < slp_test.ll | clang -x assembler - -o slp_test.good && ./slp_test.good
minidx = 5

% opt < slp_test.ll -passes=slp-vectorizer | llc | clang -x assembler - -o slp_test.bad && ./slp_test.bad
minidx = 6

I'm going to revert for now.
@chandlerc
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Reverted in r313409 while the miscompile is investigated. I did look somewhat carefully and for the life of me I can't see why this is miscompiling. =/

@RKSimon
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RKSimon commented Dec 15, 2018

I'm guessing but this might have been fixed by rL347759

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
This issue was closed.
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@chandlerc @RKSimon