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Add example for vec_bperm

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vec_bperm is a challenge for showing an example using just tables,
but I've made an attempt.

Three tables are used:
- The values of the input vectors *a* and *b*.
- A zoomed in view of the last two bytes of *a* and the bit
  manipulations therein that leads to the intermediate result.
- The result vector *r*.

Only one example has been provided, but it's getting big.

Fixes #14.

Signed-off-by: Paul A. Clarke <pc@us.ibm.com>
pull/69/head
Paul Clarke 5 years ago committed by Paul Clarke
parent 4a1a0f6613
commit 8ca90e8fd6
1 changed files with 547 additions and 0 deletions
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547
Intrinsics_Reference/ch_vec_reference.xml
Unescape Escape View File

@ -7941,6 +7941,553 @@ xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="VIPR.vec-ref">
</listitem>
</itemizedlist>
</para>
<para>An example for input <emphasis role="bold">a</emphasis>
of type vector unsigned char follows:
<informaltable frame="all">
<tgroup cols="17">
<colspec colname="c0" colwidth="10*" />
<colspec colname="c1" colwidth="10*" />
<colspec colname="c2" colwidth="10*" />
<colspec colname="c3" colwidth="10*" />
<colspec colname="c4" colwidth="10*" />
<colspec colname="c5" colwidth="10*" />
<colspec colname="c6" colwidth="10*" />
<colspec colname="c7" colwidth="10*" />
<colspec colname="c8" colwidth="10*" />
<colspec colname="c9" colwidth="10*" />
<colspec colname="c10" colwidth="10*" />
<colspec colname="c11" colwidth="10*" />
<colspec colname="c12" colwidth="10*" />
<colspec colname="c13" colwidth="10*" />
<colspec colname="c14" colwidth="10*" />
<colspec colname="c15" colwidth="10*" />
<colspec colname="c16" colwidth="10*" />
<thead>
<row>
<entry align="center" valign="middle">
<para> <emphasis>byte index</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>0</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>1</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>2</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>3</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>4</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>5</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>6</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>8</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>9</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>10</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>11</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>12</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>13</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>14</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>15</emphasis> </para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry align="center" valign="middle">
<para> <emphasis role="bold">a</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>A9</para>
</entry>
</row>
<row>
<entry align="center" valign="middle">
<para> <emphasis role="bold">b</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para>7F</para>
</entry>
<entry align="center" valign="middle">
<para>7E</para>
</entry>
<entry align="center" valign="middle">
<para>7D</para>
</entry>
<entry align="center" valign="middle">
<para>7C</para>
</entry>
<entry align="center" valign="middle">
<para>7B</para>
</entry>
<entry align="center" valign="middle">
<para>7A</para>
</entry>
<entry align="center" valign="middle">
<para>79</para>
</entry>
<entry align="center" valign="middle">
<para>78</para>
</entry>
<entry align="center" valign="middle">
<para>77</para>
</entry>
<entry align="center" valign="middle">
<para>76</para>
</entry>
<entry align="center" valign="middle">
<para>75</para>
</entry>
<entry align="center" valign="middle">
<para>74</para>
</entry>
<entry align="center" valign="middle">
<para>73</para>
</entry>
<entry align="center" valign="middle">
<para>72</para>
</entry>
<entry align="center" valign="middle">
<para>71</para>
</entry>
<entry align="center" valign="middle">
<para>70</para>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
Zoom in to view just the two bytes in <emphasis role="bold">a</emphasis>
([14..15]) containing the bits referenced by the bit indices
<emphasis role="bold">b</emphasis>[i]
<inlineequation>
<mathphrase>
(0 &#x2264; <emphasis>i</emphasis> &lt; 16),
</mathphrase>
</inlineequation>
([7F..70]):
<informaltable frame="all">
<tgroup cols="17">
<colspec colname="c0" colwidth="10*" />
<colspec colname="c1" colwidth="10*" />
<colspec colname="c2" colwidth="10*" />
<colspec colname="c3" colwidth="10*" />
<colspec colname="c4" colwidth="10*" />
<colspec colname="c5" colwidth="10*" />
<colspec colname="c6" colwidth="10*" />
<colspec colname="c7" colwidth="10*" />
<colspec colname="c8" colwidth="10*" />
<colspec colname="c9" colwidth="10*" />
<colspec colname="c10" colwidth="10*" />
<colspec colname="c11" colwidth="10*" />
<colspec colname="c12" colwidth="10*" />
<colspec colname="c13" colwidth="10*" />
<colspec colname="c14" colwidth="10*" />
<colspec colname="c15" colwidth="10*" />
<colspec colname="c16" colwidth="10*" />
<spanspec spanname="b1" namest="c1" nameend="c8"/>
<spanspec spanname="b2" namest="c9" nameend="c16"/>
<thead>
<row>
<entry align="center" valign="middle">
<para> <emphasis>byte index</emphasis> </para>
</entry>
<entry align="center" spanname="b1" valign="middle">
<para>14</para>
</entry>
<entry align="center" spanname="b2" valign="middle">
<para>15</para>
</entry>
</row>
<row>
<entry align="center" valign="middle">
<para> <emphasis>bit index</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>70</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>71</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>72</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>73</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>74</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>75</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>76</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>77</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>78</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>79</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7A</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7B</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7C</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7D</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7E</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7F</emphasis> </para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry align="center" valign="middle">
<para> <emphasis role="bold">a</emphasis> </para>
</entry>
<entry align="center" spanname="b1" valign="middle">
<para>FF</para>
</entry>
<entry align="center" spanname="b2" valign="middle">
<para>A9</para>
</entry>
</row>
<row>
<entry align="center" valign="middle">
<para> <emphasis>bit</emphasis> <emphasis role="bold">a</emphasis><subscript>bit index</subscript> </para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
</row>
<row>
<entry align="center" valign="middle">
<para> <emphasis>bit</emphasis> <emphasis role="bold">a</emphasis><emphasis role="bold"><subscript>b</subscript></emphasis><subscript>[i]</subscript> </para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>0</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
<entry align="center" valign="middle">
<para>1</para>
</entry>
</row>
<row>
<entry align="center" valign="middle">
<para> <emphasis>intermediate result</emphasis> </para>
</entry>
<entry align="center" spanname="b1" valign="middle">
<para>95</para>
</entry>
<entry align="center" spanname="b2" valign="middle">
<para>FF</para>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<informaltable frame="all">
<tgroup cols="17">
<colspec colname="c0" colwidth="10*" />
<colspec colname="c1" colwidth="10*" />
<colspec colname="c2" colwidth="10*" />
<colspec colname="c3" colwidth="10*" />
<colspec colname="c4" colwidth="10*" />
<colspec colname="c5" colwidth="10*" />
<colspec colname="c6" colwidth="10*" />
<colspec colname="c7" colwidth="10*" />
<colspec colname="c8" colwidth="10*" />
<colspec colname="c9" colwidth="10*" />
<colspec colname="c10" colwidth="10*" />
<colspec colname="c11" colwidth="10*" />
<colspec colname="c12" colwidth="10*" />
<colspec colname="c13" colwidth="10*" />
<colspec colname="c14" colwidth="10*" />
<colspec colname="c15" colwidth="10*" />
<colspec colname="c16" colwidth="10*" />
<thead>
<row>
<entry align="center" valign="middle">
<para> <emphasis>byte index</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>0</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>1</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>2</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>3</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>4</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>5</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>6</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>7</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>8</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>9</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>10</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>11</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>12</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>13</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>14</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para> <emphasis>15</emphasis> </para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry align="center" valign="middle">
<para> <emphasis role="bold">r</emphasis> </para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>95</para>
</entry>
<entry align="center" valign="middle">
<para>FF</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
<entry align="center" valign="middle">
<para>00</para>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>

<para><emphasis role="bold">Endian considerations:</emphasis>
All bit and byte numberings within each element in the above
description denote big-endian (i.e., left-to-right) order,

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