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[X86] Handle shifts + and in LowerSELECTWithCmpZero #107910

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[X86] Handle shifts + and in LowerSELECTWithCmpZero #107910

wants to merge 2 commits into from

Commits on Sep 9, 2024

  1. [X86] Add tests support shifts + and in LowerSELECTWithCmpZero; NFC

    @goldsteinn
    goldsteinn committed Sep 9, 2024
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  2. [X86] Handle shifts + and in LowerSELECTWithCmpZero 

    shifts are the same as sub where rhs == 0 is identity.
and is the inverted case where:
    `SELECT (AND(X,1) == 0), (AND Y, Z), Y`
        -> `(AND Y, (OR NEG(AND(X, 1)), Z))`
With -1 as the identity.
    @goldsteinn
    goldsteinn committed Sep 9, 2024
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