Array Sizes on 68K

["david williams"<davidwilliams at ozemail dot com dot au>]

Hi All,

I have been having some difficulty with large arrays. I am using GCC 2.91.60
(ECGS 1.1.1 release) on Win95 cross compiling for 68K. (A binary distribution
from object software).

Problem 1:
When a define a character array and intialise it with 48,980 values as follows;


const unsigned char testSample[] = {
	0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
	<snip>
	0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80};

When Iook at the generated assembler the initialisers are there and correct
but there is a skip directive after the data as follows

testSample:
        .byte 128
        .byte 128
	<snip>
        .byte 128
        .byte 128
        .skip 16556
        .even

This causes the array to be padded out to 64K.
Why is this done?

Also if I place the size of the array in the square brackets [] then GCC says
that the array is too big (as per second problem below!)

Problem 2:

I also have an array of structures as follows;

typedef	int32	TIMTime;
typedef  int32 	TIMDay;


typedef	struct
	{
	TIMTime	time;
	TIMDay	days;
	} TIM_TimeDays,
	  *TIM_TimeDays_Ptr;

/*
	Data Buffer
*/
typedef struct
	{
	word		data;
	TIM_TimeDays	timeStamp;
	} CHTrawDataPts,
		*CHTrawDataPtsPtr;

#define USR_BUFFER_ONE_SIZE		818
CHTrawDataPts USRbufferOnePts[USR_BUFFER_ONE_SIZE];

	
If I set USR_BUFFER_ONE_SIZE to 820 then compiler complains as follows

./src/usrtsk.c:300: size of array `USRbufferOnePts' is too large

Why is limit of 8196 (8K) imposed on this array of structures?

TIA 
David Williams.
davidwilliams@ozemail.com.au

	

http://www.jeack.com.au

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