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LoopVectorizer Fails to Vectorize Loops with slt but Works with sgt Despite Logical Equivalence #122100

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RonDahan101 opened this issue Jan 8, 2025 · 0 comments
Open

LoopVectorizer Fails to Vectorize Loops with slt but Works with sgt Despite Logical Equivalence #122100

RonDahan101 opened this issue Jan 8, 2025 · 0 comments
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vectorizers

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@RonDahan101
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As the title states. I have a loop that vectorize with the condition

icmp slt i32 %inc, %dec

but doesn't with

icmp sgt i32 %dec, %inc

although they are logically the same.

Reproducer vectorization succeed:

https://compiler-explorer.com/z/MzaGzWeWa

Reproducer vectorization fails:

https://compiler-explorer.com/z/hPofjKK3G
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@EugeneZelenko @llvmbot @RonDahan101