encode_amd64.s [206:213]:
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	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
	// the index of the first byte that differs. The BSF instruction finds the
	// least significant 1 bit, the amd64 architecture is little-endian, and
	// the shift by 3 converts a bit index to a byte index.
	XORQ AX, BX
	BSFQ BX, BX
	SHRQ $3, BX
	ADDQ BX, SI
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encode_amd64.s [530:537]:
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	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
	// the index of the first byte that differs. The BSF instruction finds the
	// least significant 1 bit, the amd64 architecture is little-endian, and
	// the shift by 3 converts a bit index to a byte index.
	XORQ AX, BX
	BSFQ BX, BX
	SHRQ $3, BX
	ADDQ BX, SI
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