169 lines
5.3 KiB
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169 lines
5.3 KiB
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<TITLE>1.1 About SDCC</TITLE>
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HREF="node4.html">1.2 Open Source</A>
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HREF="node2.html">1. Introduction</A>
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HREF="node2.html">1. Introduction</A>
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<H2><A NAME="SECTION00021000000000000000">
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1.1 About SDCC</A>
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</H2>
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<P>
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<B>SDCC</B> is a Freeware, retargettable, optimizing ANSI-C compiler
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by <B>Sandeep Dutta</B> designed for 8 bit Microprocessors. The
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current version targets Intel MCS51 based Microprocessors(8051,8052,
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etc), Zilog Z80 based MCUs, and the Dallas DS80C390 variant. It can
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be retargetted for other microprocessors, support for PIC, AVR and
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186 is under development. The entire source code for the compiler
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is distributed under GPL. SDCC uses ASXXXX & ASLINK, a Freeware,
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retargettable assembler & linker. SDCC has extensive language extensions
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suitable for utilizing various microcontrollers and underlying hardware
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effectively.
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<BR>
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<BR>
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In addition to the MCU specific optimizations SDCC also does a host
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of standard optimizations like:
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<P>
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<UL>
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<LI>global sub expression elimination, </LI>
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<LI>loop optimizations (loop invariant, strength reduction of induction
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variables and loop reversing), </LI>
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<LI>constant folding & propagation, </LI>
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<LI>copy propagation, </LI>
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<LI>dead code elimination </LI>
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<LI>jumptables for <I>switch</I> statements.</LI>
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</UL>
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For the back-end SDCC uses a global register allocation scheme which
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should be well suited for other 8 bit MCUs.
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<BR>
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<BR>
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The peep hole optimizer uses a rule based substitution mechanism which
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is MCU independent.
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<BR>
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<BR>
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Supported data-types are:
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<P>
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<UL>
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<LI>char (8 bits, 1 byte), </LI>
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<LI>short and int (16 bits, 2 bytes), </LI>
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<LI>long (32 bit, 4 bytes)</LI>
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<LI>float (4 byte IEEE). </LI>
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</UL>
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The compiler also allows <I>inline assembler code</I> to be embedded
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anywhere in a function. In addition, routines developed in assembly
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can also be called.
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<BR>
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<BR>
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SDCC also provides an option (-cyclomatic) to report the relative
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complexity of a function. These functions can then be further optimized,
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or hand coded in assembly if needed.
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<BR>
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<BR>
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SDCC also comes with a companion source level debugger SDCDB, the
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debugger currently uses ucSim a freeware simulator for 8051 and other
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micro-controllers.
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<BR>
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<BR>
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The latest version can be downloaded from http://sdcc.sourceforge.net/<B>.</B>
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<P>
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HREF="node2.html">1. Introduction</A>
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<B> Previous:</B> <A NAME="tex2html225"
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HREF="node2.html">1. Introduction</A>
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  <B> <A NAME="tex2html233"
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HREF="node1.html">Contents</A></B>
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HREF="node61.html">Index</A></B>
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<ADDRESS>
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<I>Johan Knol</I>
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<BR><I>2001-07-13</I>
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</ADDRESS>
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