<html> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1 dir=RTL> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>This is probably a dumb question but I'll ask it anyway.</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I was just taking a brief look in mzscheme's src, and I noticed in scheme_bitwise_shift (in /plt/src/mzschme/src/number.c) that you shift using bignum calculations if shift is more than MAX_SHIFT_TRY or less than –MAX_SHIFT_EVER. Under 32 bits, MAX_SHIFT_EVER is defined as 32, which makes sense. But why is MAX_SHIT_TRY 29? You could shift 30 bits, and ever 31 without bignum calculations, couldn't you?</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>By the way, this is not critique about the code, this is just me trying to learn :)</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Also, in /plt/src/mzscheme/src/schpriv.h, how do the following two lines help the compiler?</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>/* Compiler helper: */</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size: 10.0pt;font-family:Arial'><span dir=LTR></span>#define ESCAPED_BEFORE_HERE  return NULL</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>And last but not least, are the basics of the compiler put in a specific file? I'm trying to learn how to make a simple scheme->asm compiler for only basic data types, etc…</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,</span></font></p> <p class=MsoPlainText dir=LTR style='margin:0cm;margin-bottom:.0001pt'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> <p class=MsoPlainText dir=LTR style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Yours truly,</span></font></p> <p class=MsoPlainText dir=LTR style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>ifconfig</span></font></p> <p class=MsoPlainText dir=LTR style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>BAGOS</span></font></p> <p class=MsoPlainText dir=LTR style='margin:0cm;margin-bottom:.0001pt'><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>http://bagos.sourceforge.net</span></font></p> <p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi: embed'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p> </div> </body> </html>