David Edelsohn wrote: > On Mon, Nov 18, 2013 at 3:07 PM, Ulrich Weigand <uweig...@de.ibm.com> wrote: > > Also note that this patch does not change how TDmode values are loaded > > into GPRs: on little-endian, this means we do get the usual LE subreg > > order there (least significant word in lowest-numbered register). This > > does still seem the right thing to do, because there are no instructions > > that operate on DFP values in GPRs, and because this allows us to keep > > using subregs on GPRs in that case, and it allows moving TDmode between > > memory and GPRs (e.g. for vararg arguments) in the usual way. > > Does this require special support in GDB so that it understands how to > interpret this type in different classes of registers? However, the > interpretation always will be consistent for a particular class of > register.
Ah, good point. Yes, GDB will need to be changed, but this looks to be straightforward. GDB already uses "pseudo" registers to represent _Decimal128 in FPR pairs, they simply need to be glued together the right way on little-endian. I'll fix this. Bye, Ulrich -- Dr. Ulrich Weigand GNU/Linux compilers and toolchain ulrich.weig...@de.ibm.com
