MOVD	x+0(FP), F0; 	\
	/* whether x is NaN */; \
	FEQD	F0, F0, X6;	\
	BNEZ	X6, 3(PC);	\
	/* return NaN if x is NaN */; \
	MOVD	F0, ret+8(FP); 	\
	RET;			\
	MOV	$PosInf, X6;	\
	FMVDX	X6, F1;		\
	FABSD	F0, F2;		\
	/* if abs(x) > +Inf, return Inf instead of round(x) */; \
	FLTD	F1, F2, X6;	\
	/* Inf should keep same signed with x then return */;	\
	BEQZ	X6, 3(PC); \
	FCVTLD.MODE	F0, X6;	\
	FCVTDL	X6, F1;		\

	"BEXT",
	"BEXTI",
	"BINV",
	"BINVI",
	"BSET",
	"BSETI",
	"WORD",
	"BEQZ",
	"BGEZ",
	"BGT",
	"BGTU",
	"BGTZ",
	"BLE",
	"BLEU",
	"BLEZ",
	"BLTZ",
	"BNEZ",
	"FABSD",
	"FABSS",
	"FNEGD",
	"FNEGS",
	"FNED",
	"FNES",
	"MOV",
	"MOVB",
	"MOVBU",
	"MOVF",
	"MOVD",
	"MOVH",
	"MOVHU",
	"MOVW",
	"MOVWU",
	"NEG",
	"NEGW",
	"NOT",

	return float32(math.Sqrt(float64(x)))
}

// Check that it's using integer registers
func abs(x, y float64) {
	// amd64:"BTRQ\t[$]63"
	// arm64:"FABSD\t"
	// s390x:"LPDFR\t",-"MOVD\t"     (no integer load/store)
	// ppc64x:"FABS\t"
	// riscv64:"FABSD\t"
	// wasm:"F64Abs"
	// arm/6:"ABSD\t"
	// mips64/hardfloat:"ABSD\t"
	// mips/hardfloat:"ABSD\t"
	sink64[0] = math.Abs(x)

	"CSNEG",
	"CSNEGW",
	"DC",
	"DCPS1",
	"DCPS2",
	"DCPS3",
	"DMB",
	"DRPS",
	"DSB",
	"DWORD",
	"EON",
	"EONW",
	"EOR",
	"EORW",
	"ERET",
	"EXTR",
	"EXTRW",
	"FABSD",
	"FABSS",
	"FADDD",
	"FADDS",
	"FCCMPD",
	"FCCMPED",
	"FCCMPES",
	"FCCMPS",
	"FCMPD",
	"FCMPED",
	"FCMPES",
	"FCMPS",
	"FCSELD",
	"FCSELS",
	"FCVTDH",
	"FCVTDS",

	FMOVD	$Overflow, F1
	FCMPD	F1, F0
	BGT	overflow	// x > Overflow, return PosInf
	FMOVD	$Underflow, F1
	FCMPD	F1, F0
	BLT	underflow	// x < Underflow, return 0
	MOVD	$NearZero, R0
	FMOVD	R0, F2
	FABSD	F0, F3
	FMOVD	$1.0, F1	// F1 = 1.0
	FCMPD	F2, F3
	BLT	nearzero	// fabs(x) < NearZero, return 1 + x
	// argument reduction, x = k*ln2 + r,  |r| <= 0.5*ln2
	// computed as r = hi - lo for extra precision.
	FMOVD	$Log2e, F2