To me, the time it takes to execute is more important than the size of the code.
And the fastest way will usually <strike>be the smallest too</strike> not be the smallest.
On a 16F @ 4Mhz with WORD variables ...
<table cellpadding=6 border=1><tr><td align=center>Formula</td><td align=center>Execution Time</td><td align=center>Words per<br>Instance</td><td align=center>Words added<br>to Library</td></tr><tr><td>x = x*25</td><td align=center>230 - 250uS<br>depends on X value</td><td align=center>12</td><td align=center>27</td></tr><tr><td>x = x<<4 + x<<3 + x</td><td align=center>110uS</td><td align=center>34</td><td align=center>13</td></tr><tr><td> T = X << 1
T = T << 1
T = T << 1
X = T << 1 + T + X </td><td align=center>31uS</td></td><td align=center>30</td><td align=center>13<br>adds SHIFTL to library<br>but doesn't use it.</td></tr></table>
I wonder if ASM will help
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