sys/src/libc/386/387/log.s


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TEXT	log(SB), $0
	FMOVD	$0.69314718055994530941, F0
	FMOVD	a+0(FP), F0

	FTST
	WAIT
	FSTSW	AX
	SAHF
	JLO	bad

	FYL2X
	RET

TEXT	log10(SB), $0
	FMOVD	$0.30102999566398119521, F0
	FMOVD	a+0(FP), F0

	FTST
	WAIT
	FSTSW	AX
	SAHF
	JLO	bad

	FYL2X
	RET

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