[sdcc-devel] [ sdcc-Patches-1700823 ] Z80 peephole and code generation patch

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Patches item #1700823, was opened at 2007-04-15 01:21
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Philipp Krause (spth)
Assigned to: Nobody/Anonymous (nobody)
Summary: Z80 peephole and code generation patch

Initial Comment:
This patch contains a complete rewrite of the Z80 peephole rules and a minor modification of Z80 code generation.

This patch significantly improves size and speed of generated Z80 asm code. The regression tests pass without failures. In my test program I got this size reduction:

sdcc 2.6.5 #4749: 23354 bytes.
sdcc 2.6.5 #4749 with this patch: 23081 bytes.
sdcc 2.6.5 #4749 with this patch and the one in bugreport 1677178: 22940 bytes.

This test program contains ~15KB data and hand-coded asm, so we see a significant improvement in the sdcc-generated code.

Philipp


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