Sławomir Kawa schreef op 2020-06-13 21:08:
Hi,
I have a question/advice request.
Lately I have builded easy-pdk programmer and started playing with
padauk
uc and SDCC. I'm using PFS154 as it's MTP . When i wan't to check some
register bit for example PIN state or interrupt flag for PA i'm using:
if( INTRQ & INTRQ_PA0 ) { __nop(); }
which would produce asm like that:
mov a, __intrq
and a, #0x01
cneqsn a, #0x00
goto 00188$
nop
00188$:
but pdk has instruction t0sn / t1sn (Check IO bit and skip next
instruction
if it’s low/high) and code like below works much faster (two
instruction
less):
__asm__ ( "t1sn __intrq, #1;\n" "goto 00099$;\n" );
{
__nop();
}
__asm__("00099$:\n");
Is there a way to make the SDCC use tXsn in bitwise operations like
that ?
Or write it more elegantly/better ?
This sounds like an excellent job for the peephole optimizer.
Are there restrictions on the operand that should be checked?
Maarten
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