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diff --git a/zpu/roadshow/roadshow/codesize/index.html b/zpu/roadshow/roadshow/codesize/index.html deleted file mode 100644 index 3f61b4e..0000000 --- a/zpu/roadshow/roadshow/codesize/index.html +++ /dev/null @@ -1,58 +0,0 @@ -<html> -<body> -<h1>Compiling hello world program with the ZPU GCC toolchain</h1> -The ZPU comes with a standard GCC toolchain and an instruction set simulator. This allows compiling, running & debugging simple test programs. The Simulator has -some very basic peripherals defined: counter, timer interrupt and a debug output port. -<h1>Installation</h1> -<ol> -<li>Install Cygwin. http://www.cygwin.com -<li>Start Cygwin bash -<li>unzip zputoolchain.zip -<li>Add install/bin from zputoolchain.zip to PATH.<br> -export PATH=$PATH:<unzipdir>/install/bin -</ol> -<h1>Hello world example</h1> -The ZPU toolchain comes with newlib & libstdc++ support which means that many C/C++ programs can be compiled without modification. -<p> -<code> -zpu-elf-gcc -Os -zeta hello.c -o hello.elf -Wl,--relax -Wl,--gc-sections<br> -zpu-elf-size hello.elf<br> -</code> -<h1>Optimizing for size</h1> -The ZPU toolchain produces highly compact code. -<ol> -<li>Since the ZPU GCC toolchain supports standard ANSI C, it is easy to stumble across -functionality that takes up a lot of space. E.g. the standard printf() function is a beast. Some compilers drop e.g. floating point support -from the printf() function and thus boast a "smaller" printf() when in fact they have a non-standard printf(). newlib has a standard printf() function -and an alternative iprintf() function that works only on integers. -<li>The ZPU ships with default startup code that works across various configurations of the ZPU, so be warned that there is some overhead that will -not occurr in the final application(anywhere between 1-4kBytes). -<li>Compilation and linker options matter. The ZPU benefits greatly from the "-Wl,--relax -Wl,--gc-sections" options which is not used by -all architectures(e.g. GCC ARM does not implement/need -Wl,--relax). -</ol> -<h2>Small code example</h2> -<code> -zpu-elf-gcc -Os -abel smallstd.c -o smallstd.elf -Wl,--relax -Wl,--gc-sections<br> -zpu-elf-size small.elf<br> -<br> -$ zpu-elf-size small.elf<br> - text data bss dec hex filename<br> - 2845 952 36 3833 ef9 small.elf<br> -<br> -</code> - -<h2>Even smaller code example</h2> -If the ZPU implements the optional instructions, the RAM overhead can be reduced significantly. -<p> -<code> -zpu-elf-gcc -Os -abel crt0_phi.S small.c -o small.elf -Wl,--relax -Wl,--gc-sections -nostdlib <br> -zpu-elf-size small.elf<br> -<br> -$ zpu-elf-size small.elf<br> - text data bss dec hex filename<br> - 56 8 0 64 40 small.elf<br> - <br> -</code> - -</body> -</html> |
