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| <h4 class="subsection">6.56.14 PowerPC Built-in Functions</h4> |
| |
| <p>These built-in functions are available for the PowerPC family of |
| processors: |
| <pre class="smallexample"> float __builtin_recipdivf (float, float); |
| float __builtin_rsqrtf (float); |
| double __builtin_recipdiv (double, double); |
| double __builtin_rsqrt (double); |
| long __builtin_bpermd (long, long); |
| uint64_t __builtin_ppc_get_timebase (); |
| unsigned long __builtin_ppc_mftb (); |
| </pre> |
| <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>The <code>__builtin_recipdiv</code>, and <code>__builtin_recipdivf</code> |
| functions generate multiple instructions to implement division using |
| the reciprocal estimate instructions. |
| |
| <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. |
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