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| <h5 class="subsubsection">6.52.9.2 Paired-Single Built-in Functions</h5> |
| |
| <p>The following paired-single functions map directly to a particular |
| MIPS instruction. Please refer to the architecture specification |
| for details on what each instruction does. |
| |
| <dl> |
| <dt><code>v2sf __builtin_mips_pll_ps (v2sf, v2sf)</code><dd>Pair lower lower (<code>pll.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_pul_ps (v2sf, v2sf)</code><dd>Pair upper lower (<code>pul.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_plu_ps (v2sf, v2sf)</code><dd>Pair lower upper (<code>plu.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_puu_ps (v2sf, v2sf)</code><dd>Pair upper upper (<code>puu.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_cvt_ps_s (float, float)</code><dd>Convert pair to paired single (<code>cvt.ps.s</code>). |
| |
| <br><dt><code>float __builtin_mips_cvt_s_pl (v2sf)</code><dd>Convert pair lower to single (<code>cvt.s.pl</code>). |
| |
| <br><dt><code>float __builtin_mips_cvt_s_pu (v2sf)</code><dd>Convert pair upper to single (<code>cvt.s.pu</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_abs_ps (v2sf)</code><dd>Absolute value (<code>abs.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_alnv_ps (v2sf, v2sf, int)</code><dd>Align variable (<code>alnv.ps</code>). |
| |
| <p><em>Note:</em> The value of the third parameter must be 0 or 4 |
| modulo 8, otherwise the result will be unpredictable. Please read the |
| instruction description for details. |
| </dl> |
| |
| <p>The following multi-instruction functions are also available. |
| In each case, <var>cond</var> can be any of the 16 floating-point conditions: |
| <code>f</code>, <code>un</code>, <code>eq</code>, <code>ueq</code>, <code>olt</code>, <code>ult</code>, |
| <code>ole</code>, <code>ule</code>, <code>sf</code>, <code>ngle</code>, <code>seq</code>, <code>ngl</code>, |
| <code>lt</code>, <code>nge</code>, <code>le</code> or <code>ngt</code>. |
| |
| <dl> |
| <dt><code>v2sf __builtin_mips_movt_c_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>, v2sf </code><var>c</var><code>, v2sf </code><var>d</var><code>)</code><dt><code>v2sf __builtin_mips_movf_c_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>, v2sf </code><var>c</var><code>, v2sf </code><var>d</var><code>)</code><dd>Conditional move based on floating point comparison (<code>c.</code><var>cond</var><code>.ps</code>, |
| <code>movt.ps</code>/<code>movf.ps</code>). |
| |
| <p>The <code>movt</code> functions return the value <var>x</var> computed by: |
| |
| <pre class="smallexample"> c.<var>cond</var>.ps <var>cc</var>,<var>a</var>,<var>b</var> |
| mov.ps <var>x</var>,<var>c</var> |
| movt.ps <var>x</var>,<var>d</var>,<var>cc</var> |
| </pre> |
| <p>The <code>movf</code> functions are similar but use <code>movf.ps</code> instead |
| of <code>movt.ps</code>. |
| |
| <br><dt><code>int __builtin_mips_upper_c_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>)</code><dt><code>int __builtin_mips_lower_c_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>)</code><dd>Comparison of two paired-single values (<code>c.</code><var>cond</var><code>.ps</code>, |
| <code>bc1t</code>/<code>bc1f</code>). |
| |
| <p>These functions compare <var>a</var> and <var>b</var> using <code>c.</code><var>cond</var><code>.ps</code> |
| and return either the upper or lower half of the result. For example: |
| |
| <pre class="smallexample"> v2sf a, b; |
| if (__builtin_mips_upper_c_eq_ps (a, b)) |
| upper_halves_are_equal (); |
| else |
| upper_halves_are_unequal (); |
| |
| if (__builtin_mips_lower_c_eq_ps (a, b)) |
| lower_halves_are_equal (); |
| else |
| lower_halves_are_unequal (); |
| </pre> |
| </dl> |
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