On Fri, Apr 26, 2013 at 07:00:37PM -0400, Vladimir Makarov wrote: > 2013-04-26 Vladimir Makarov <vmaka...@redhat.com> > > * lra.c (setup_operand_alternative): Ignore '?'. > * lra-constraints.c (process_alt_operands): Print cost dump for > alternatives. Check only moves for cycling. > (curr_insn_transform): Print insn name.
I'm not sure I'm comfortable with ignoring the '?' altogether. For example, if you do something in the GPR unit, instructions run at one cycle, while if you do it in the vector unit, it runs in two cycles. In the past, I've seen cases where it wanted to spill floating point values from the floating point registers to the CTR. And if you spill to the LR, it can interfere with the call cache. Admitily, when to use '!', '?', and '*' is unclear, and unfortunately it has changed over time. -- Michael Meissner, IBM IBM, M/S 2506R, 550 King Street, Littleton, MA 01460, USA email: meiss...@linux.vnet.ibm.com, phone: +1 (978) 899-4797
