7 lines
197 B
Go
7 lines
197 B
Go
package x64
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// REX is used to generate a REX prefix.
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// w, r, x and b can only be set to either 0 or 1.
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func REX(w, r, x, b byte) byte {
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return 0b0100_0000 | (w << 3) | (r << 2) | (x << 1) | b
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}
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