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Revert "GlobalISel: Use & operator on KnownBits"

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This reverts commit e53b799779b079a70f600e5cad2ab7267d66b1b7.

Confusingly, this does not simply and the two sets of known bits, but
implements known bits for the and operator.
This commit is contained in:
Matt Arsenault 2020-08-27 18:41:02 -04:00
parent 2df7657efb
commit bb532337e4
1 changed files with 2 additions and 1 deletions
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lib/CodeGen/GlobalISel/GISelKnownBits.cpp
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@ -110,7 +110,8 @@ void GISelKnownBits::computeKnownBitsMin(Register Src0, Register Src1,
computeKnownBitsImpl(Src0, Known2, DemandedElts, Depth);
// Only known if known in both the LHS and RHS.
Known &= Known2;
Known.Zero &= Known.Zero;
Known.One &= Known.One;
}
void GISelKnownBits::computeKnownBitsImpl(Register R, KnownBits &Known,