Hi All,
Was porting gcc 4.8.1 to the private target which has 8 bit regs and
can be used as pair for 16bit like AB ,CD but not BC or AD.
I was stuck in the type promotion like
int i;
unsigned char c;
int test ()
{
i =c;
}
defined the zero_extendqihi2 pattern for the above c construct like
(define_expand zero_extendqihi2
[(set (operand:hi 0 "" """)
(zero_extend:hi (operand:qi 1)))]
""
if(!reload_completed)
{
if(operands[1] != REG)
operands[1]= force_reg(QI,operands[1]);
/* Here i need to enforce gcc to use the next consective paired reg
like B if operands[1] is in A reg or D if operands[1] is in C */
}
)
How do i module the above reguirement in the backend ?
Thank you
~Umesh
