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Attributor may attempt to truncate a smaller value to a larger one #50799

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jdoerfert opened this issue Aug 12, 2021 · 3 comments
Closed

Attributor may attempt to truncate a smaller value to a larger one #50799

jdoerfert opened this issue Aug 12, 2021 · 3 comments
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bugzilla Issues migrated from bugzilla ipo Interprocedural optimizations

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@jdoerfert
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Bugzilla Link 51457
Resolution FIXED
Resolved on Oct 11, 2021 20:29
Version trunk
OS Linux
Blocks #51489
Fixed by commit(s) 5f54391 24d8b65

Extended Description

While casting constants we did not explicitly check if the types were larger before calling CreateTrunc, this crashed:

store i32 42, i32* @​bytes2
%bc = bitcast i32* @​bytes2 to i64*
%l = load i64, i64* %bc
@jdoerfert
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@​Tom can we backport this, please.
Small change but can actually happen for OpenMP codes by default (O1 and higher)

@tstellar
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Merged: 24d8b65

@tstellar
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mentioned in issue #51489

@tstellar tstellar mentioned this issue Oct 12, 2021
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@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 11, 2021
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@tstellar @jdoerfert