Am 17.08.23 um 23:27 schrieb Alan Cox:
How do you check over/underflow in C without wasting memory?
If your compiler is smart enough then for unsigned maths
r = a + b;
if (r < a)
will be optimized nicely. I've not checked if sdcc knows that and will
turn it into a carry check
> How do you check over/underflow in C without wasting memory?
If your compiler is smart enough then for unsigned maths
r = a + b;
if (r < a)
will be optimized nicely. I've not checked if sdcc knows that and will
turn it into a carry check at least for uint8 and uint16.
For sign
Hi!
Am 17.08.23 um 22:13 schrieb Michael A Hawkins:
Hello SDCC users,
I am sure this has been discussed before. So I apologize in advance for
repeating it.
With assembler, you can test for a reg/mem operation over/under flow by
checking the carry flag.
So for C, when overflows are involved, I
Hello SDCC users,
I am sure this has been discussed before. So I apologize in advance for
repeating it.
With assembler, you can test for a reg/mem operation over/under flow by
checking the carry flag.
So for C, when overflows are involved, I have always used larger
variables. For 8 bit, use 16 b
