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<p>This one for Marģers specifically,</p>
<p>You'll be pleased to know that your insight has been partially
implemented!</p>
<p><a class="moz-txt-link-freetext" href="https://gitlab.com/freepascal.org/fpc/source/-/merge_requests/51">https://gitlab.com/freepascal.org/fpc/source/-/merge_requests/51</a></p>
<p>This only expands 32-bit divisions to 64-bit, since the smaller
sizes requires more work at the node level, but is certainly
possible and will happily continue to experiment with seeing if it
can be implemented. This was fun to do!</p>
<p>The test "bench/bdiv.pp" (also "tests/test/cg/tmoddiv6.pp" which
just includes the given file) is my benchmark test for division
and modulus operations if anyone wants to see if they can make the
fundamental routine faster on any platform.</p>
<p>Gareth aka. Kit<br>
</p>
<div class="moz-cite-prefix">On 24/08/2021 20:14, Marģers . via
fpc-devel wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1629832449.6125450124779@mail.inbox.lv">
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I came up with even shorter variant of div<br>
example <br>
function teDWordDivBy7_v4( divided : dword):dword; assembler;
nostackframe;<br>
asm<br>
mov ecx,divided<br>
mov rax,2635249153693862181<br>
mul rcx<br>
mov eax,edx<br>
end;<br>
<br>
current version for comparison<br>
<br>
function teDWordDivBy7_v0( divided : dword):dword; assembler;
nostackframe;<br>
asm<br>
mov ecx,divided<br>
mov eax,613566757<br>
mul ecx<br>
add edx,ecx<br>
rcr edx,1<br>
shr edx,2<br>
mov eax,edx<br>
end;<br>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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