17 lines
695 B
Plaintext
17 lines
695 B
Plaintext
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$FG,5$These take a pointer to a bit field.$FG$
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$WW,1$$FG,2$Bt$FG$: Bit Test
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$FG,2$Bts$FG$: Bit Test and Set to one
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$FG,2$Btr$FG$: Bit Test and Rst to zero
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$FG,2$Btc$FG$: Bit Test and Compliment (toggle)
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$FG,2$BEqu$FG$: Set bit to value.
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$FG$$FG,5$Bit operations are "atomic" meaning they won't be interrupted between the testing of the bit and the alteration. This is important when multitasking. With multiprocessing, you should "Lock" these operations.$FG$
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$FG,5$These don't take a pointer, but the actual field.$FG$
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$FG,2$Bsf$FG$: Bit Scan Fwd (Pos of first low one bit or -1)
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$FG,2$Bsr$FG$: Bit Scan Reverse (Pos of first high one bit or -1)
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$FG,2$BCnt$FG$: Bit Cnt (Cnt of set bits)
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