On Fri, Apr 22, 2016 at 01:22:51PM +0000, Wilco Dijkstra wrote: > Improve modes_tieable by returning true in more cases: allow scalar access > within vectors without requiring an extra move. Removing these moves helps > the register allocator in deciding whether to use integer or FP registers on > operations that can be done on both. This saves about 100 instructions in the > gcc.target/aarch64 tests. > > A typical example: > > orr v1.8b, v0.8b, v1.8b > fmov x0, d0 > fmov x1, d1 > add x0, x1, x0 > ins v0.d[0], x0 > orr v0.8b, v1.8b, v0.8b > > after: > > orr v1.8b, v0.8b, v1.8b > add d0, d1, d0 > orr v0.8b, v1.8b, v0.8b > > OK for trunk?
OK. Thanks, James > > ChangeLog: > 2016-04-22 Wilco Dijkstra <wdijk...@arm.com> > > * gcc/config/aarch64/aarch64.c (aarch64_modes_tieable_p): > Allow scalar/single vector modes to be tieable. >
