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[NFC][InstCombine] Negator: add a comment about negating exact arithmentic shift

Authored by lebedev.ri on Aug 6 2020, 11:07 AM.

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[NFC][InstCombine] Negator: add a comment about negating exact arithmentic shift

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lebedev.riAug 6 2020, 1:37 PM
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rG442cb88f5344: [InstCombine] Generalize sdiv exact X, 1<<C --> ashr exact X, C fold to…
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