15 lines
698 B
Plaintext
15 lines
698 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$Bit operations are "atomic" meaning they won't be interrupted between the testing of the bit and the alteration. This is important when multitasking. With multicore processing, you should "Lock" these operations.$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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