Added preliminary benchmark results

Signed-off-by: Andrea Zoppi <texzk@email.it>

README.md

@@ -112,9 +112,33 @@ meson compile benchmark-report
 ```
 
 
-### Benchmark Results
+### OPL3 Benchmark Results
 
-**TODO**
+Some preliminary benchmarks were run against some very different CPUs:
+
+| System | OS | CPU | SIMD | Notes
+|:-|:-|:-|:-|:-|
+| PC | Windows 10 | i7 6700k | x86 SSE4.1 + AVX2 | Home PC |
+| BeagleBone Black | Debian 11 | ARM Cortex-A8 | ARMv7 NEON | Headless |
+| Raspberry Pi 5 | Debian 12 | ARM Cortex-A76 | ARMv7 NEON | Headless + Heatsink Fan |
+
+All the systems were updated to their latest software and OS releases.
+The compiler was *GCC* for all these machines.
+All the scores were played via `aymo_ymf262_play --benchmark --loops 3`, except for the *BBB* which did not loop (too slow!).
+
+All the systems run `--cpu-ext dummy`, which mimics the overhead of the test harness itself (mostly the score decoder), to subtract it from the actual benchmarks.
+The reference implementation is *NukedOPL3*, run as `--cpu-ext none`.
+
+Here's a summary of the results:
+
+| CPU | SIMD | Ratio | DevSt | Speedup |
+|:-|:-|-:|-:|-:|
+| i7 6700k | x86 SSE4.1 | 0.590 | 0.026 | 1.695 |
+| i7 6700k | x86 AVX2 | 0.302 | 0.013 | 3.315 |
+| ARM Cortex-A8 | ARMv7 NEON | 0.575 | 0.035 | 1.740 |
+| ARM Cortex-A76 | ARMv7 NEON | 0.374 | 0.010 | 2.671 |
+
+![Benchmark Results](./doc/benchmarks/benchmark-results.png)
 
 
 ## Integration

doc/benchmarks/BBB_ARM-A8.csv

@@ -0,0 +1,11 @@
+SCORE,dummy,none,arm_neon
+"BeyondSN.vgm",0.235000,23.964000,12.382000
+"bmf1_1.ref",0.448000,40.540000,23.893000
+"bmf1_2.ref",0.439000,39.252000,23.368000
+"crusader.raw",0.352000,30.499000,18.735000
+"doofus.dro",0.625000,59.484000,37.468000
+"dro_v2.dro",0.820000,79.142000,45.182000
+"dystopia.ref",1.190000,111.587000,60.619000
+"GALWAY.ref",0.300000,29.206000,15.615000
+"inc.raw",0.120000,10.472000,6.296000
+"loudness.ref",0.023000,1.978000,1.179000

doc/benchmarks/PC_i7-6700k.csv

@@ -0,0 +1,11 @@
+SCORE,dummy,none,x86_avx2,x86_sse41
+"BeyondSN.vgm",0.046000,5.109000,1.453000,2.859000
+"bmf1_1.ref",0.093000,8.922000,2.812000,5.343000
+"bmf1_2.ref",0.078000,8.563000,2.688000,5.265000
+"crusader.raw",0.078000,6.859000,2.203000,4.218000
+"doofus.dro",0.125000,13.797000,4.375000,8.078000
+"dro_v2.dro",0.172000,18.312000,5.438000,10.453000
+"dystopia.ref",0.234000,24.437000,7.125000,13.656000
+"GALWAY.ref",0.047000,6.031000,1.860000,3.640000
+"inc.raw",0.031000,2.390000,0.734000,1.406000
+"loudness.ref",0.000000,0.437000,0.141000,0.281000

doc/benchmarks/RPi5_ARM-A76.csv

@@ -0,0 +1,11 @@
+SCORE,dummy,none,arm_neon
+"BeyondSN.vgm",0.076017,7.737659,2.811513
+"bmf1_1.ref",0.146062,14.089469,5.268482
+"bmf1_2.ref",0.142800,13.359588,5.147929
+"crusader.raw",0.114323,10.722416,4.119310
+"doofus.dro",0.210133,21.032906,8.351923
+"dro_v2.dro",0.282348,27.369149,10.219190
+"dystopia.ref",0.396055,36.095204,13.373861
+"GALWAY.ref",0.096829,9.003890,3.521635
+"inc.raw",0.038078,3.576043,1.386682
+"loudness.ref",0.007435,0.682634,0.261767