Single-precision -mcustom-* option

Single-precision -mcustom-* option

The -mcustom-fpu-cfg=60-1 option is equivalent to setting

-mcustom-fmuls=252

-mcustom-fadds=253

-mcustom-fsubs=254

-fsingle-precision-constant

The -mcustom-fpu-cfg=60-2 option is equivalent to setting

-mcustom-fmuls=252

-mcustom-fadds=253

-mcustom-fsubs=254

-mcustom-fdivs=255

-fsingle-precision-constant

However, be aware that these two "60" options are applied late when scanning the command line. The consequence is that you cannot disable -fsingle-precision-constant if either of these options is present.

The "60" in the options' names refers to the first version of the Nios dev kit that supports them (6.0).

first operand	second operand	operation	result	nios2-elf-gcc option	GCC pattern name
float	float	+	float	-mcustom-fadds=N	addsf3
float	float	-	float	-mcustom-fsubs=N	subsf3
float	float	*	float	-mcustom-fmuls=N	mulsf3
float	float	/	float	-mcustom-fdivs=N	divsf3
float	float	min	float	-mcustom-fmins=N	minsf3
float	float	max	float	-mcustom-fmaxs=N	maxsf3
float	none	negation	float	-mcustom-fnegs=N	negsf2
float	none	abs	float	-mcustom-fabss=N	abssf2
float	none	sqrt	float	-mcustom-fsqrts=N	sqrtsf2
float	none	cos	float	-mcustom-fcoss=N	cossf2
float	none	sin	float	-mcustom-fsins=N	sinsf2
float	none	tan	float	-mcustom-ftans=N	tansf2
float	none	atan	float	-mcustom-fatans=N	atansf2
float	none	exp	float	-mcustom-fexps=N	expsf2
float	none	log	float	-mcustom-flogs=N	logsf2
float	float	<	int	-mcustom-fcmplts=N	nios2_sltsf
float	float	<=	int	-mcustom-fcmples=N	nios2_slesf
float	float	>	int	-mcustom-fcmpgts=N	nios2_sgtsf
float	float	>=	int	-mcustom-fcmpges=N	nios2_sgesf
float	float	==	int	-mcustom-fcmpeqs=N	nios2_seqsf
float	float	!=	int	-mcustom-fcmpnes=N	nios2_snesf

int	none	int to float	float	-mcustom-floatis=N	floatsisf2
unsigned	none	unsigned to float	float	-mcustom-floatus=N	floatunssisf2
float	none	float to int	int	-mcustom-fixsi=N	fixsfsi2
float	none	float to unsigned	unsigned	-mcustom-fixsu=N	fixunssfsi2