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126 lines
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126 lines
6.5 KiB
HTML
4 years ago
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<title>Paired-Single Built-in Functions - Using the GNU Compiler Collection (GCC)</title>
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<link rel="up" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" title="MIPS Loongson Built-in Functions">
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<link rel="prev" href="Paired_002dSingle-Arithmetic.html#Paired_002dSingle-Arithmetic" title="Paired-Single Arithmetic">
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<link rel="next" href="MIPS_002d3D-Built_002din-Functions.html#MIPS_002d3D-Built_002din-Functions" title="MIPS-3D Built-in Functions">
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<div class="node">
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<a name="Paired-Single-Built-in-Functions"></a>
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<a name="Paired_002dSingle-Built_002din-Functions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="MIPS_002d3D-Built_002din-Functions.html#MIPS_002d3D-Built_002din-Functions">MIPS-3D Built-in Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="Paired_002dSingle-Arithmetic.html#Paired_002dSingle-Arithmetic">Paired-Single Arithmetic</a>,
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Up: <a rel="up" accesskey="u" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions">MIPS Loongson Built-in Functions</a>
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<hr>
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</div>
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<h5 class="subsubsection">6.58.14.2 Paired-Single Built-in Functions</h5>
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<p>The following paired-single functions map directly to a particular
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MIPS instruction. Please refer to the architecture specification
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for details on what each instruction does.
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<dl>
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<dt><code>v2sf __builtin_mips_pll_ps (v2sf, v2sf)</code><dd>Pair lower lower (<code>pll.ps</code>).
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<br><dt><code>v2sf __builtin_mips_pul_ps (v2sf, v2sf)</code><dd>Pair upper lower (<code>pul.ps</code>).
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<br><dt><code>v2sf __builtin_mips_plu_ps (v2sf, v2sf)</code><dd>Pair lower upper (<code>plu.ps</code>).
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<br><dt><code>v2sf __builtin_mips_puu_ps (v2sf, v2sf)</code><dd>Pair upper upper (<code>puu.ps</code>).
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<br><dt><code>v2sf __builtin_mips_cvt_ps_s (float, float)</code><dd>Convert pair to paired single (<code>cvt.ps.s</code>).
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<br><dt><code>float __builtin_mips_cvt_s_pl (v2sf)</code><dd>Convert pair lower to single (<code>cvt.s.pl</code>).
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<br><dt><code>float __builtin_mips_cvt_s_pu (v2sf)</code><dd>Convert pair upper to single (<code>cvt.s.pu</code>).
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<br><dt><code>v2sf __builtin_mips_abs_ps (v2sf)</code><dd>Absolute value (<code>abs.ps</code>).
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<br><dt><code>v2sf __builtin_mips_alnv_ps (v2sf, v2sf, int)</code><dd>Align variable (<code>alnv.ps</code>).
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<p><em>Note:</em> The value of the third parameter must be 0 or 4
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modulo 8, otherwise the result is unpredictable. Please read the
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instruction description for details.
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</dl>
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<p>The following multi-instruction functions are also available.
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In each case, <var>cond</var> can be any of the 16 floating-point conditions:
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<code>f</code>, <code>un</code>, <code>eq</code>, <code>ueq</code>, <code>olt</code>, <code>ult</code>,
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<code>ole</code>, <code>ule</code>, <code>sf</code>, <code>ngle</code>, <code>seq</code>, <code>ngl</code>,
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<code>lt</code>, <code>nge</code>, <code>le</code> or <code>ngt</code>.
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<dl>
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<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>,
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<code>movt.ps</code>/<code>movf.ps</code>).
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<p>The <code>movt</code> functions return the value <var>x</var> computed by:
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<pre class="smallexample"> c.<var>cond</var>.ps <var>cc</var>,<var>a</var>,<var>b</var>
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mov.ps <var>x</var>,<var>c</var>
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movt.ps <var>x</var>,<var>d</var>,<var>cc</var>
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</pre>
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<p>The <code>movf</code> functions are similar but use <code>movf.ps</code> instead
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of <code>movt.ps</code>.
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<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>,
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<code>bc1t</code>/<code>bc1f</code>).
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<p>These functions compare <var>a</var> and <var>b</var> using <code>c.</code><var>cond</var><code>.ps</code>
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and return either the upper or lower half of the result. For example:
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<pre class="smallexample"> v2sf a, b;
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if (__builtin_mips_upper_c_eq_ps (a, b))
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upper_halves_are_equal ();
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else
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upper_halves_are_unequal ();
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if (__builtin_mips_lower_c_eq_ps (a, b))
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lower_halves_are_equal ();
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else
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lower_halves_are_unequal ();
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</pre>
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</dl>
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</body></html>
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