Double-precision -mcustom-* options

[#1]

Double-precision -mcustom-* options

first operand	second operand	operation	result	nios2-elf-gcc option	GCC pattern name
double	none	write X	none	-mcustom-fwrx=N	nios2_fwrx
float	none	write Y	none	-mcustom-fwry=N	nios2_fwry
none	none	read low half of X	float	-mcustom-frdxlo=N	nios2_frdxlo
none	none	read high half of X	float	-mcustom-frdxhi=N	nios2_frdxhi
none	none	read Y	float	-mcustom-frdy=N	nios2_frdy
double	double	+	double	-mcustom-faddd=N	adddf3
double	double	-	double	-mcustom-fsubd=N	subdf3
double	double	*	double	-mcustom-fmuld=N	muldf3
double	double	/	double	-mcustom-fdivd=N	divdf3
double	double	min	double	-mcustom-fmind=N	mindf3
double	double	max	double	-mcustom-fmaxd=N	maxdf3
double	none	negation	double	-mcustom-fnegd=N	negdf2
double	none	abs	double	-mcustom-fabsd=N	absdf2
double	none	sqrt	double	-mcustom-fsqrtd=N	sqrtdf2
double	none	cos	double	-mcustom-fcosd=N	cosdf2
double	none	sin	double	-mcustom-fsind=N	sindf2
double	none	tan	double	-mcustom-ftand=N	tandf2
double	none	atan	double	-mcustom-fatand=N	atandf2
double	none	exp	double	-mcustom-fexpd=N	expdf2
double	none	log	double	-mcustom-flogd=N	logdf2
double	double	<	int	-mcustom-fcmpltd=N	nios2_sltdf
double	double	<=	int	-mcustom-fcmpled=N	nios2_sledf
double	double	>	int	-mcustom-fcmpgtd=N	nios2_sgtdf
double	double	>=	int	-mcustom-fcmpged=N	nios2_sgedf
double	double	==	int	-mcustom-fcmpeqd=N	nios2_seqdf
double	double	!=	int	-mcustom-fcmpned=N	nios2_snedf
int	none	int to double	double	-mcustom-floatid=N	floatsidf2
unsigned	none	unsigned to double	double	-mcustom-floatud=N	floatunssidf2
double	none	double to int	int	-mcustom-fixdi=N	fixdfsi2
double	none	double to unsigned	unsigned	-mcustom-fixdu=N	fixunsdfsi2
float	none	float to double	double	-mcustom-fextsd=N	extendsfdf2
double	none	double to float	float	-mcustom-ftruncds=N	truncdfsf2