Hi
I am using c5504 with DSP-BIOS 5.42.1.09 and compiler version 4.4.1
I have ap piece of code that looks like:
xxx.h
#define INVALID_SLOT (0xFFFF)
xxx.c
void Task (void)
{
uint16 slot;
while (1)
{
MBX_pend(MBX_HND(TSK_A), &mbx_a, SYS_FOREVER);
...
slot = get_slot();
if (slot == INVALID_SLOT)
{
......
}
else
{
......
}
}
}
In disassembly I see:
At the beginning of the function:
MOV #-1,T2
and later:
//if (slot == INVALID_SLOT)
01f246: 2249 MOV T0,AR1
01f248: 129c64 CMPU AR1 != T2, TC1
BUT T2 IS NOT 0xFFFF !!!!! (T2 value changed during program run)
my function result is compared to the wrong value, causing program malfunction.
Am I doing something wrong?
P.S.
I can overcome this issue if I write:
uint16 tmp = INVALID_SLOT;
if (slot == tmp).....
but it's ugly and ineffective
