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<dt>page <a class="el" href="index.html">POWER Vector Library (pveclib)</a> </dt>
<dd><a class="anchor" id="_todo000001"></a>Is there a way for automake to compile vec_int512_runtime.c with -mcpu=power9 and -o vec_runtime_PWR9.o? And similarly for PWR7/PWR8. </dd>
<dt>File <a class="el" href="vec__bcd__ppc_8h.html">vec_bcd_ppc.h</a> </dt>
<dd><a class="anchor" id="_todo000004"></a>The BCD add/subtract extend/carry story is not complete. The carry extend operations based only on the <b>OV</b> condition codes only works as expected for bcdadd operands with the same sign and bcdsub with different signs. See <a class="el" href="vec__bcd__ppc_8h.html#a76d5034289bea5c7d9159db1d443f6b7" title="Decimal Add & write Carry Signed Quadword.">vec_bcdaddcsq()</a> and <a class="el" href="vec__bcd__ppc_8h.html#a6bf159e0abdccaa6fca21c6567b2067b" title="Decimal Add Extended & write Carry Signed Quadword.">vec_bcdaddecsq()</a>. Extended BCD difference (or subtract the same sign or add with different signs) is more complicated. See <a class="el" href="vec__bcd__ppc_8h.html#abd666963d18930e07be06aeb563eeb71" title="Decimal Sudtract & write Carry Signed Quadword.">vec_bcdsubcsq()</a> and <a class="el" href="vec__bcd__ppc_8h.html#a7eeb50993901b8bef76fa72cea668a15" title="Decimal Add Extended & write Carry Signed Quadword.">vec_bcdsubecsq()</a>. Generating a true borrow seems to require looking one (31-digit) column ahead or behind. The first attempt at generating correct borrowing is implemented in <a class="el" href="vec__bcd__ppc_8h.html#a486605817b8ca4850f7cf5584c751f45" title="Combined Decimal Add & Write Carry Signed Quadword.">vec_cbcdaddcsq()</a> and <a class="el" href="vec__bcd__ppc_8h.html#af9718d91a7e14c4a21e14a53f2f65041" title="Combined Decimal Add Extended & write Carry Signed Quadword.">vec_cbcdaddecsq()</a>. There are still cases where these operation will generate a borrow and invert (10s complement) incorrectly. The net seems to be that for BCD multiple precision difference to work correctly, the larger magnitude must be the first operand. </dd>
<dt>File <a class="el" href="vec__int128__ppc_8h.html">vec_int128_ppc.h</a> </dt>
<dd><a class="anchor" id="_todo000003"></a> The implementation above gives correct results for all the cases tested for divide by constants 10<sup>31</sup> and 10<sup>32</sup>). This is not a mathematical proof of correctness, just an observation. Anyone who finds a counter example or offers a mathematical proof should submit a bug report. </dd>
<dt>File <a class="el" href="vec__int512__ppc_8h.html">vec_int512_ppc.h</a> </dt>
<dd><a class="anchor" id="_todo000002"></a>Currently the dynamic resolvers and <em>IFUNC</em> symbols for vec_int512_runtime.c are contained within vec_runtime_DYN.c. As the list of runtime operations expands to other element sizes/types, vec_runtime_DYN.c should be refactored into multiple files.</dd>
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