mpi: optimize mpi_rshift and mpi_lshift to avoid extra MPI copying

* mpi/mpi-bit.c (_gcry_mpi_rshift): Refactor so that _gcry_mpih_rshift
is used to do the copying along with shifting when copying is needed
and refactor so that same code-path is used for both in-place and
copying operation.
(_gcry_mpi_lshift): Refactor so that _gcry_mpih_lshift is used to do
the copying along with shifting when copying is needed and refactor
so that same code-path is used for both in-place and copying operation.
--

Benchmark on AMD Ryzen 9 7900X:

 Before:
                    |  nanosecs/byte   mebibytes/sec   cycles/byte  auto Mhz
 rshift3            |     0.039 ns/B     24662 MiB/s     0.182 c/B      4700
 lshift3            |     0.108 ns/B      8832 MiB/s     0.508 c/B      4700
 rshift65           |     0.137 ns/B      6968 MiB/s     0.643 c/B      4700
 lshift65           |     0.109 ns/B      8776 MiB/s     0.511 c/B      4700

 After:
                    |  nanosecs/byte   mebibytes/sec   cycles/byte  auto Mhz
 rshift3            |     0.038 ns/B     25049 MiB/s     0.179 c/B      4700
 lshift3            |     0.039 ns/B     24709 MiB/s     0.181 c/B      4700
 rshift65           |     0.038 ns/B     24942 MiB/s     0.180 c/B      4700
 lshift65           |     0.040 ns/B     23671 MiB/s     0.189 c/B      4700

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

0 files changed, 0 insertions, 0 deletions