Hi all,
I have a question regarding inline assembly in sdcc:
I have some assembly code which I would like to put in a macro that is to be
called many times throughout my C-code. For efficiency reasons this short piece
of assembly must be inlined hence I can't use a function. Also this macro must
take an argument and herein lies the problem. My assembly code must know which
register contains this input value, i.e. I need a way to "connect" my C
variables to my assembly registers.
I need something like:
// placeholder == '%r', to be substituted by whatever register the compiler
allocates for 'val'
#define MY_MACRO (val) __asm__("mov a,%r", val)
Is something like this possible?
Even better would be if the compiler could also substitute a placeholder by a
free register that is unused by the surrounding function for more complicated
computations:
// placeholder == '%ur', register to be reserved and substituted
#define MY_MACRO (val) __asm__(
"mov %ur,a\n",
"dec %ur\n",
"mov a,%ur\n"
)
Thanks,
Stijn
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
Sdcc-user mailing list
Sdcc-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sdcc-user
