20 lines
499 B
Go
20 lines
499 B
Go
package x64
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// ScaleFactor encodes the scale factor.
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type ScaleFactor = byte
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const (
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Scale1 = ScaleFactor(0b00)
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Scale2 = ScaleFactor(0b01)
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Scale4 = ScaleFactor(0b10)
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Scale8 = ScaleFactor(0b11)
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)
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// SIB is used to generate an SIB byte.
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// - scale: 2 bits. Multiplies the value of the index.
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// - index: 3 bits. Specifies the index register.
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// - base: 3 bits. Specifies the base register.
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func SIB(scale ScaleFactor, index byte, base byte) byte {
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return (scale << 6) | (index << 3) | base
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}
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