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TEXT	sqrt(SB), $0
	FMOVD	a+0(FP), F0

	FTST
	WAIT
	FSTSW	AX
	SAHF
	JLO	bad

	FSQRT
	RET

bad:
	FMOVDP	F0, F0
	CALL	NaN(SB)
	RET