• sdcc
• sccz80
• Making code faster without rewriting it
• Sample results
• Making code smaller
• Tips
• Use unsigned where possible (sccz80, zsdcc)
• Prefer unsigned char (sccz80, zsdcc)
• Switch on a char (sccz80)
• Operate with a constant value (sccz80)
• Constant ordering (sccz80)
• Prefer pre- to post-increment/decrement (sccz80)
• When possible use static variables (sccz80/zsdcc)
• Avoid long lists of function parameters (sccz80/zsdcc)
• Use types of appropriate size (sccz80/zsdcc)
• Demote larger types to smaller types as soon as possible (sccz80/zsdcc)
• Declare most frequently used variables last (sccz80)
• Use (in)equality operators by preference (sccz80)
• Avoid inserting debugging code (sccz80)
• Use the __z88dk_fastcall calling convention (sccz80, zsdcc)
• Use __z88dk_callee calling convention (sccz80, sdcc)
• Compute things once and store the result (sccz80/zsdcc)
• Assign data to appropriate sections (sccz80/zsdcc)
• Do not reinvent the wheel
• Split your libraries in modules
• Classic Library
• Disable std*
• Switch to an alternate console driver
• Disable unused graphics modes
• Link to the dummy fcntl library
• Switch maths library implementations
• Don't initialise BSS memory
• Disable/reduce the atexit stack
• Newlib
• Ensure that the minimal crt required is selected
• Modify the crt to change font
• Configure the library and crt