BSF - (386+ only)

BSF - Bit Scan Forward (386+ only)

Scans source operand for first bit set. Sets ZF if a bit is found set and loads the destination with an index to first set bit. Clears ZF is no bits are found set. BSF scans forward across bit pattern (0-n) while BSR scans in reverse (n-0).

Usage:

	BSF	dest,src

Modifies flags:

ZF

	Clocks				Size
Operands	808x	286	386	486	Bytes
reg,reg	-	-	10+3n	6-42	3
reg,mem	-	-	10+3n	7-43	3-7
reg32,reg32	-	-	10+3n	6-42	3-7
reg32,mem32	-	-	10+3n	7-43	3-7

see Instructions list, Instruction Timing, 8086 Architecture, CPU

2023/01/05 22:53 · frater

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BSF - (386+ only)

BSF - Bit Scan Forward (386+ only)

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