TEXT polyHashADInternal<>(SB), NOSPLIT, $0
	// adp points to beginning of additional data
	// itr2 holds ad length
	XORQ acc0, acc0
	XORQ acc1, acc1
	XORQ acc2, acc2
	CMPQ itr2, $13
	JNE  hashADLoop

openFastTLSAD:
	// Special treatment for the TLS case of 13 bytes
	MOVQ (adp), acc0
	MOVQ 5(adp), acc1
	SHRQ $24, acc1
	MOVQ $1, acc2
	polyMul
	RET

hashADLoop:

		// TODO: have these return flags instead of bool.  The current system generates:
		//    CMPXCHGQ ...
		//    SETEQ AX
		//    CMPB  AX, $0
		//    JNE ...
		// instead of just
		//    CMPXCHGQ ...
		//    JEQ ...
		// but we can't do that because memory-using ops can't generate flags yet
		// (flagalloc wants to move flag-generating instructions around).