I understood what you suggested. But how to define a register class (possibly in <MACHINE>.c file). Paulo J. Matos-3 wrote: > > On 18/10/11 08:06, vikramsp wrote: >> >> In my .md file there is an insn >> (define_insn abssf2 >> .... >> .... >> (clobber (match_scratch 2 "")) >> >> the %2 register is allocated as r0 in the real code. >> My problem is that i want other than r0 to be allocated >> for operand 2. >> Please help how to do that. > > In the "" after the 2 comes the constraint list. Constrain the register > to be somewhere that doesn't include r0. > > So, for example, define a constraint x that corresponds to a register > class that doesn't contain r0 and then do: > (define_insn abssf2 > .... > .... > (clobber (match_scratch 2 "x")) > > -- > PMatos > > > -- View this message in context: http://old.nabble.com/register-allocation-in-gcc-tp32672662p32676581.html Sent from the gcc - Help mailing list archive at Nabble.com.
