[sdcc-devel] [ sdcc-Bugs-3527285 ] Variable allocated to registers is damaged.

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Bugs item #3527285, was opened at 2012-05-16 05:15
Message generated for change (Tracker Item Submitted) made by speccy2007
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: syd (speccy2007)
Assigned to: Nobody/Anonymous (nobody)
Summary: Variable allocated to registers is damaged.

Initial Comment:
1. Code:
#include <stdio.h>

unsigned long GetX()
{
	return 0x12345678;
}

char GetY()
{
	return 1;
}

int main() __reentrant
{
	unsigned long x;
	char buff[20];

	x = GetX();
	if( GetY() != 0 )
	{
		sprintf( buff, "%.8lx", x );
	}

	return 0;
}

Variable "x" (allocated to registers r4-r7) is damaged.

;	test0003.c:21: sprintf( buff, "%.8lx", x );
	push	ar4
	push	ar5
	push	ar6
	push	ar7
	mov	r3,_bp
	inc	r3
	mov	ar2,r3
	mov	r3,#0x00
	mov	r7,#0x40 // here the "x" is damaged
	push	ar4
	push	ar5
	push	ar6
	push	ar7 //  here the "x" is pushed to stack as sprintf argument
	mov	a,#__str_0
	push	acc
	mov	a,#(__str_0 >> 8)
	push	acc
	mov	a,#0x80
	push	acc
	push	ar2
	push	ar3
	push	ar7
	lcall	_sprintf
	mov	a,sp
	add	a,#0xf6
	mov	sp,a

2. Cmd line "sdcc test0003.c"
3. SDCC : mcs51/gbz80/z80/z180/r2k/ds390/pic16/pic14/TININative/ds400/hc08 3.1.5 #7708 (May 16 2012) (MINGW32)

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