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| <h4 class="subsection">6.57.21 PowerPC Built-in Functions</h4> |
| |
| <p>These built-in functions are available for the PowerPC family of |
| processors: |
| </p><div class="smallexample"> |
| <pre class="smallexample">float __builtin_recipdivf (float, float); |
| float __builtin_rsqrtf (float); |
| double __builtin_recipdiv (double, double); |
| double __builtin_rsqrt (double); |
| uint64_t __builtin_ppc_get_timebase (); |
| unsigned long __builtin_ppc_mftb (); |
| double __builtin_unpack_longdouble (long double, int); |
| long double __builtin_pack_longdouble (double, double); |
| </pre></div> |
| |
| <p>The <code>vec_rsqrt</code>, <code>__builtin_rsqrt</code>, and |
| <code>__builtin_rsqrtf</code> functions generate multiple instructions to |
| implement the reciprocal sqrt functionality using reciprocal sqrt |
| estimate instructions. |
| </p> |
| <p>The <code>__builtin_recipdiv</code>, and <code>__builtin_recipdivf</code> |
| functions generate multiple instructions to implement division using |
| the reciprocal estimate instructions. |
| </p> |
| <p>The <code>__builtin_ppc_get_timebase</code> and <code>__builtin_ppc_mftb</code> |
| functions generate instructions to read the Time Base Register. The |
| <code>__builtin_ppc_get_timebase</code> function may generate multiple |
| instructions and always returns the 64 bits of the Time Base Register. |
| The <code>__builtin_ppc_mftb</code> function always generates one instruction and |
| returns the Time Base Register value as an unsigned long, throwing away |
| the most significant word on 32-bit environments. |
| </p> |
| <p>The following built-in functions are available for the PowerPC family |
| of processors, starting with ISA 2.06 or later (<samp>-mcpu=power7</samp> |
| or <samp>-mpopcntd</samp>): |
| </p><div class="smallexample"> |
| <pre class="smallexample">long __builtin_bpermd (long, long); |
| int __builtin_divwe (int, int); |
| int __builtin_divweo (int, int); |
| unsigned int __builtin_divweu (unsigned int, unsigned int); |
| unsigned int __builtin_divweuo (unsigned int, unsigned int); |
| long __builtin_divde (long, long); |
| long __builtin_divdeo (long, long); |
| unsigned long __builtin_divdeu (unsigned long, unsigned long); |
| unsigned long __builtin_divdeuo (unsigned long, unsigned long); |
| unsigned int cdtbcd (unsigned int); |
| unsigned int cbcdtd (unsigned int); |
| unsigned int addg6s (unsigned int, unsigned int); |
| </pre></div> |
| |
| <p>The <code>__builtin_divde</code>, <code>__builtin_divdeo</code>, |
| <code>__builitin_divdeu</code>, <code>__builtin_divdeou</code> functions require a |
| 64-bit environment support ISA 2.06 or later. |
| </p> |
| <p>The following built-in functions are available for the PowerPC family |
| of processors when hardware decimal floating point |
| (<samp>-mhard-dfp</samp>) is available: |
| </p><div class="smallexample"> |
| <pre class="smallexample">_Decimal64 __builtin_dxex (_Decimal64); |
| _Decimal128 __builtin_dxexq (_Decimal128); |
| _Decimal64 __builtin_ddedpd (int, _Decimal64); |
| _Decimal128 __builtin_ddedpdq (int, _Decimal128); |
| _Decimal64 __builtin_denbcd (int, _Decimal64); |
| _Decimal128 __builtin_denbcdq (int, _Decimal128); |
| _Decimal64 __builtin_diex (_Decimal64, _Decimal64); |
| _Decimal128 _builtin_diexq (_Decimal128, _Decimal128); |
| _Decimal64 __builtin_dscli (_Decimal64, int); |
| _Decimal128 __builitn_dscliq (_Decimal128, int); |
| _Decimal64 __builtin_dscri (_Decimal64, int); |
| _Decimal128 __builitn_dscriq (_Decimal128, int); |
| unsigned long long __builtin_unpack_dec128 (_Decimal128, int); |
| _Decimal128 __builtin_pack_dec128 (unsigned long long, unsigned long long); |
| </pre></div> |
| |
| <p>The following built-in functions are available for the PowerPC family |
| of processors when the Vector Scalar (vsx) instruction set is |
| available: |
| </p><div class="smallexample"> |
| <pre class="smallexample">unsigned long long __builtin_unpack_vector_int128 (vector __int128_t, int); |
| vector __int128_t __builtin_pack_vector_int128 (unsigned long long, |
| unsigned long long); |
| </pre></div> |
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