tree e5b0666f8de39dea392e8cd6f3f2a97e9b94377e
parent 7d2c05fcf2c0b11be72f9dfff5944c7f0fef64f5
author Ryan Prichard <rprichard@google.com> 1577148347 -0800
committer rohan <purohit.rohan@gmail.com> 1593345175 -0400

Neon-optimized version of the GNU symbol calculation

On 64-bit walleye, improves the linker relocation benchmark from 71.9ms to
70.7ms (1.7% of the run-time).

On a 32-bit device, it improves the linker relocation benchmark from
205.5ms to 201.2ms (2.1% of the run-time).

$ adb shell taskset 10 /data/benchmarktest64/linker-benchmarks/linker-benchmarks --benchmark_repetitions=100 --benchmark_display_aggregates_only
--------------------------------------------------------------------
Benchmark                          Time             CPU   Iterations
--------------------------------------------------------------------
BM_gnu_hash_simple_mean        15232 ns        15212 ns          100
BM_gnu_hash_simple_median      15176 ns        15159 ns          100
BM_gnu_hash_simple_stddev        111 ns          110 ns          100
BM_gnu_hash_neon_mean          10265 ns        10252 ns          100
BM_gnu_hash_neon_median        10261 ns        10249 ns          100
BM_gnu_hash_neon_stddev         28.1 ns         23.9 ns          100

Bug: none
Test: linker-unit-tests
Test: linker-benchmarks
Change-Id: I3983bca1dddc9241bb70290ad3651d895f046660
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>