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| <h5 class="subsubsection">6.52.9.3 MIPS-3D Built-in Functions</h5> |
| |
| <p>The MIPS-3D Application-Specific Extension (ASE) includes additional |
| paired-single instructions that are designed to improve the performance |
| of 3D graphics operations. Support for these instructions is controlled |
| by the <samp><span class="option">-mips3d</span></samp> command-line option. |
| |
| <p>The functions listed below map directly to a particular MIPS-3D |
| instruction. Please refer to the architecture specification for |
| more details on what each instruction does. |
| |
| <dl> |
| <dt><code>v2sf __builtin_mips_addr_ps (v2sf, v2sf)</code><dd>Reduction add (<code>addr.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_mulr_ps (v2sf, v2sf)</code><dd>Reduction multiply (<code>mulr.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_cvt_pw_ps (v2sf)</code><dd>Convert paired single to paired word (<code>cvt.pw.ps</code>). |
| |
| <br><dt><code>v2sf __builtin_mips_cvt_ps_pw (v2sf)</code><dd>Convert paired word to paired single (<code>cvt.ps.pw</code>). |
| |
| <br><dt><code>float __builtin_mips_recip1_s (float)</code><dt><code>double __builtin_mips_recip1_d (double)</code><dt><code>v2sf __builtin_mips_recip1_ps (v2sf)</code><dd>Reduced precision reciprocal (sequence step 1) (<code>recip1.</code><var>fmt</var>). |
| |
| <br><dt><code>float __builtin_mips_recip2_s (float, float)</code><dt><code>double __builtin_mips_recip2_d (double, double)</code><dt><code>v2sf __builtin_mips_recip2_ps (v2sf, v2sf)</code><dd>Reduced precision reciprocal (sequence step 2) (<code>recip2.</code><var>fmt</var>). |
| |
| <br><dt><code>float __builtin_mips_rsqrt1_s (float)</code><dt><code>double __builtin_mips_rsqrt1_d (double)</code><dt><code>v2sf __builtin_mips_rsqrt1_ps (v2sf)</code><dd>Reduced precision reciprocal square root (sequence step 1) |
| (<code>rsqrt1.</code><var>fmt</var>). |
| |
| <br><dt><code>float __builtin_mips_rsqrt2_s (float, float)</code><dt><code>double __builtin_mips_rsqrt2_d (double, double)</code><dt><code>v2sf __builtin_mips_rsqrt2_ps (v2sf, v2sf)</code><dd>Reduced precision reciprocal square root (sequence step 2) |
| (<code>rsqrt2.</code><var>fmt</var>). |
| </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>int __builtin_mips_cabs_</code><var>cond</var><code>_s (float </code><var>a</var><code>, float </code><var>b</var><code>)</code><dt><code>int __builtin_mips_cabs_</code><var>cond</var><code>_d (double </code><var>a</var><code>, double </code><var>b</var><code>)</code><dd>Absolute comparison of two scalar values (<code>cabs.</code><var>cond</var><code>.</code><var>fmt</var>, |
| <code>bc1t</code>/<code>bc1f</code>). |
| |
| <p>These functions compare <var>a</var> and <var>b</var> using <code>cabs.</code><var>cond</var><code>.s</code> |
| or <code>cabs.</code><var>cond</var><code>.d</code> and return the result as a boolean value. |
| For example: |
| |
| <pre class="smallexample"> float a, b; |
| if (__builtin_mips_cabs_eq_s (a, b)) |
| true (); |
| else |
| false (); |
| </pre> |
| <br><dt><code>int __builtin_mips_upper_cabs_</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_cabs_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>)</code><dd>Absolute comparison of two paired-single values (<code>cabs.</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>cabs.</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_cabs_eq_ps (a, b)) |
| upper_halves_are_equal (); |
| else |
| upper_halves_are_unequal (); |
| |
| if (__builtin_mips_lower_cabs_eq_ps (a, b)) |
| lower_halves_are_equal (); |
| else |
| lower_halves_are_unequal (); |
| </pre> |
| <br><dt><code>v2sf __builtin_mips_movt_cabs_</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_cabs_</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 absolute comparison (<code>cabs.</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"> cabs.<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_any_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_all_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_any_cabs_</code><var>cond</var><code>_ps (v2sf </code><var>a</var><code>, v2sf </code><var>b</var><code>)</code><dt><code>int __builtin_mips_all_cabs_</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>cabs.</code><var>cond</var><code>.ps</code>, |
| <code>bc1any2t</code>/<code>bc1any2f</code>). |
| |
| <p>These functions compare <var>a</var> and <var>b</var> using <code>c.</code><var>cond</var><code>.ps</code> |
| or <code>cabs.</code><var>cond</var><code>.ps</code>. The <code>any</code> forms return true if either |
| result is true and the <code>all</code> forms return true if both results are true. |
| For example: |
| |
| <pre class="smallexample"> v2sf a, b; |
| if (__builtin_mips_any_c_eq_ps (a, b)) |
| one_is_true (); |
| else |
| both_are_false (); |
| |
| if (__builtin_mips_all_c_eq_ps (a, b)) |
| both_are_true (); |
| else |
| one_is_false (); |
| </pre> |
| <br><dt><code>int __builtin_mips_any_c_</code><var>cond</var><code>_4s (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>int __builtin_mips_all_c_</code><var>cond</var><code>_4s (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>int __builtin_mips_any_cabs_</code><var>cond</var><code>_4s (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>int __builtin_mips_all_cabs_</code><var>cond</var><code>_4s (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>Comparison of four paired-single values |
| (<code>c.</code><var>cond</var><code>.ps</code>/<code>cabs.</code><var>cond</var><code>.ps</code>, |
| <code>bc1any4t</code>/<code>bc1any4f</code>). |
| |
| <p>These functions use <code>c.</code><var>cond</var><code>.ps</code> or <code>cabs.</code><var>cond</var><code>.ps</code> |
| to compare <var>a</var> with <var>b</var> and to compare <var>c</var> with <var>d</var>. |
| The <code>any</code> forms return true if any of the four results are true |
| and the <code>all</code> forms return true if all four results are true. |
| For example: |
| |
| <pre class="smallexample"> v2sf a, b, c, d; |
| if (__builtin_mips_any_c_eq_4s (a, b, c, d)) |
| some_are_true (); |
| else |
| all_are_false (); |
| |
| if (__builtin_mips_all_c_eq_4s (a, b, c, d)) |
| all_are_true (); |
| else |
| some_are_false (); |
| </pre> |
| </dl> |
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