[sdcc-devel] [ sdcc-Bugs-2023121 ] compiler improperly reuses registers - pic14

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Bugs item #2023121, was opened at 2008-07-20 19:42
Message generated for change (Comment added) made by tkeithbossert
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Category: pic14 target
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Keith (tkeithbossert)
Assigned to: Nobody/Anonymous (nobody)
Summary: compiler improperly reuses registers - pic14

Initial Comment:
Using the command:
sdcc -mpic14 -p16f628a test.c
to compile the attached file test.c, with sdcc version 2.8.1, the compiler improperly reuses registers.

For example, look at the assembly file, and notice that the function sendStringSerial(unsigned char *) calls both the function delay(unsigned char) and the function sendByteSerial(unsigned char).

In my assembly file delay(unsigned char) and sendByteSerial(unsigned char) both use r0x102D and r0x102E.  This messes things up for sendStringSerial(unsigned char *) because sendStringSerial(unsigned char *) uses r0x102D and r0x102E to hold part of the pointer from its parameter.

Note that if I modify sendStringSerial(unsigned char *) so that it is completely self-contained, it sends strings as it should, but if sendStringSerial(unsigned char *) calls other functions to simplify its work, the compiler messes up.

If I can attach more files, I'll include my assembly file, and a version with a self-contained sendStringSerial(unsigned char *).

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>Comment By: Keith (tkeithbossert)
Date: 2008-07-20 19:44

Message:
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Originator: YES

File Added: test.asm

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