Re: [sdcc-devel] found a magic number 0x102----sdcc PIC14 PORT

[Gál Z. <tra...@fr...>]

I can confirm this problem with my experince. I found that the problem
takes place when the "magic" number is an even number between 0x102
and 0x1FE. I didn't find problem with 0x100 and less or with 0x200 and
more. I didn't make test with all of the number from 0 - 0xFFFF, only
just few around 0x100,0x200,0x300,0x700.

; File Created by SDCC : free open source ANSI-C Compiler
; Version 3.2.1 #8235 (Dec 15 2012) (Linux)
; This file was generated Mon Dec 31 09:19:13 2012

I used this command for compiling:

sdcc -mpic14 -p16f887 -V --debug
-I/home/zsolti/Fejlesztes/PIC_Programok/PIC16F/sdcc_teszt/c_teszt/ -c
disappear.c --use-non-free --verbose --nogcse --no-pcode-opt
--noinvariant --no-peep --noinduction --nooverlay --nolabelopt
--nojtbound --noloopreverse

It looks like that command line options according optimizations
doesn't solved the problem.

I made a little modification also on the source, but it didn't help,
so the problem still exists:

#include"pic16f887.h"

void main()
{
	int i, temp = 0;
	for (i=0 ;i<10; i++)
	{
		temp += ( int )0x1FE; //  this will be disappear magically.
                                                 //  I mean the number
0x102 will NOT be added to the temp.
                                                 //  if the number is
other besides 0x102, everything is all right
		PORTA = temp;  // I konwn only the low 8 bit will be used.
		
	}
}