The basic built-in functions described in this section are
available on the PowerPC family of processors starting with ISA 3.0
or later. Unless specific options are explicitly disabled on the
command line, specifying option `-mcpu=power9` has the effect of
enabling all the same options as for `-mcpu=power8` in
addition to the `-misel` option.

The following built-in functions are available on Linux 64-bit systems
that use the ISA 3.0 instruction set (`-mcpu=power9`):

`__float128 __builtin_addf128_round_to_odd (__float128, __float128)`

Perform a 128-bit IEEE floating point add using round to odd as the rounding mode.

`__float128 __builtin_subf128_round_to_odd (__float128, __float128)`

Perform a 128-bit IEEE floating point subtract using round to odd as the rounding mode.

`__float128 __builtin_mulf128_round_to_odd (__float128, __float128)`

Perform a 128-bit IEEE floating point multiply using round to odd as the rounding mode.

`__float128 __builtin_divf128_round_to_odd (__float128, __float128)`

Perform a 128-bit IEEE floating point divide using round to odd as the rounding mode.

`__float128 __builtin_sqrtf128_round_to_odd (__float128)`

Perform a 128-bit IEEE floating point square root using round to odd as the rounding mode.

`__float128 __builtin_fmaf128_round_to_odd (__float128, __float128, __float128)`

Perform a 128-bit IEEE floating point fused multiply and add operation using round to odd as the rounding mode.

`double __builtin_truncf128_round_to_odd (__float128)`

Convert a 128-bit IEEE floating point value to

`double`

using round to odd as the rounding mode.

The following additional built-in functions are also available for the PowerPC family of processors, starting with ISA 3.0 or later:

long long __builtin_darn (void); long long __builtin_darn_raw (void); int __builtin_darn_32 (void);

The `__builtin_darn`

and `__builtin_darn_raw`

functions require a
64-bit environment supporting ISA 3.0 or later.
The `__builtin_darn`

function provides a 64-bit conditioned
random number. The `__builtin_darn_raw`

function provides a
64-bit raw random number. The `__builtin_darn_32`

function
provides a 32-bit conditioned random number.

The following additional built-in functions are also available for the PowerPC family of processors, starting with ISA 3.0 or later:

int __builtin_byte_in_set (unsigned char u, unsigned long long set); int __builtin_byte_in_range (unsigned char u, unsigned int range); int __builtin_byte_in_either_range (unsigned char u, unsigned int ranges); int __builtin_dfp_dtstsfi_lt (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_lt (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_lt_dd (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_lt_td (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_gt (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_gt (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_gt_dd (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_gt_td (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_eq (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_eq (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_eq_dd (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_eq_td (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_ov (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_ov (unsigned int comparison, _Decimal128 value); int __builtin_dfp_dtstsfi_ov_dd (unsigned int comparison, _Decimal64 value); int __builtin_dfp_dtstsfi_ov_td (unsigned int comparison, _Decimal128 value); double __builtin_mffsl(void);

The `__builtin_byte_in_set`

function requires a
64-bit environment supporting ISA 3.0 or later. This function returns
a non-zero value if and only if its `u`

argument exactly equals one of
the eight bytes contained within its 64-bit `set`

argument.

The `__builtin_byte_in_range`

and
`__builtin_byte_in_either_range`

require an environment
supporting ISA 3.0 or later. For these two functions, the
`range`

argument is encoded as 4 bytes, organized as
`hi_1:lo_1:hi_2:lo_2`

.
The `__builtin_byte_in_range`

function returns a
non-zero value if and only if its `u`

argument is within the
range bounded between `lo_2`

and `hi_2`

inclusive.
The `__builtin_byte_in_either_range`

function returns non-zero if
and only if its `u`

argument is within either the range bounded
between `lo_1`

and `hi_1`

inclusive or the range bounded
between `lo_2`

and `hi_2`

inclusive.

The `__builtin_dfp_dtstsfi_lt`

function returns a non-zero value
if and only if the number of signficant digits of its `value`

argument
is less than its `comparison`

argument. The
`__builtin_dfp_dtstsfi_lt_dd`

and
`__builtin_dfp_dtstsfi_lt_td`

functions behave similarly, but
require that the type of the `value`

argument be
`__Decimal64`

and `__Decimal128`

respectively.

The `__builtin_dfp_dtstsfi_gt`

function returns a non-zero value
if and only if the number of signficant digits of its `value`

argument
is greater than its `comparison`

argument. The
`__builtin_dfp_dtstsfi_gt_dd`

and
`__builtin_dfp_dtstsfi_gt_td`

functions behave similarly, but
require that the type of the `value`

argument be
`__Decimal64`

and `__Decimal128`

respectively.

The `__builtin_dfp_dtstsfi_eq`

function returns a non-zero value
if and only if the number of signficant digits of its `value`

argument
equals its `comparison`

argument. The
`__builtin_dfp_dtstsfi_eq_dd`

and
`__builtin_dfp_dtstsfi_eq_td`

functions behave similarly, but
require that the type of the `value`

argument be
`__Decimal64`

and `__Decimal128`

respectively.

The `__builtin_dfp_dtstsfi_ov`

function returns a non-zero value
if and only if its `value`

argument has an undefined number of
significant digits, such as when `value`

is an encoding of `NaN`

.
The `__builtin_dfp_dtstsfi_ov_dd`

and
`__builtin_dfp_dtstsfi_ov_td`

functions behave similarly, but
require that the type of the `value`

argument be
`__Decimal64`

and `__Decimal128`

respectively.

The `__builtin_mffsl`

uses the ISA 3.0 `mffsl`

instruction to read
the FPSCR. The instruction is a lower latency version of the `mffs`

instruction. If the `mffsl`

instruction is not available, then the
builtin uses the older `mffs`

instruction to read the FPSCR.