benwtrent opened a new issue, #12621:
URL: https://github.com/apache/lucene/issues/12621
### Description
While testing and digging around, I noticed that our float comparisons are
way faster than byte on my Macbook (M1) and pretty much the same as our byte
comparisons on a GCP Intel Sapphire Rapids CPU.
This seems counter-intuitive to me. I would expect Panama to be able to do
more `byte` operations per cycle than `float`. My guess is the intrinsics are
weird? Panama Vector just doesn't support or detect the required operations?
Here are two benchmark results using @rmuir's helpful vectorbench project:
MacBook (Apple Silicon [128bits], JDK21):
```
FloatDotProductBenchmark.dotProductNew 768 thrpt 5 21.781 ± 0.254
ops/us
FloatDotProductBenchmark.dotProductNew 1024 thrpt 5 15.091 ± 0.217
ops/us
BinaryDotProductBenchmark.dotProductNew 768 thrpt 5 8.041 ± 0.108
ops/us
BinaryDotProductBenchmark.dotProductNew 1024 thrpt 5 6.085 ± 0.133
ops/us
```
GCP (Intel Sapphire Rapids [avx512], JDK21):
```
FloatDotProductBenchmark.dotProductNew 768 thrpt 5 20.169 ± 0.385
ops/us
FloatDotProductBenchmark.dotProductNew 1024 thrpt 5 18.334 ± 0.180
ops/us
BinaryDotProductBenchmark.dotProductNew 768 thrpt 5 19.686 ± 0.050
ops/us
BinaryDotProductBenchmark.dotProductNew 1024 thrpt 5 14.934 ± 0.014
ops/us
```
<details>
<summary>cpu-flags</summary>
```
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov pat pse36 clflus
h mmx fxsr sse sse2 ss ht syscall nx
pdpe1gb rdtscp lm constant_tsc rep_good n
opl xtopology nonstop_tsc cpuid
tsc_known_freq pni pclmulqdq ssse3 fma cx16 pc
id sse4_1 sse4_2 x2apic movbe popcnt aes
xsave avx f16c rdrand hypervisor lahf
_lm abm 3dnowprefetch invpcid_single ssbd
ibrs ibpb stibp ibrs_enhanced fsgsba
se tsc_adjust bmi1 avx2 smep bmi2 erms
invpcid rtm avx512f avx512dq rdseed adx
smap avx512ifma clflushopt clwb avx512cd
sha_ni avx512bw avx512vl xsaveopt xs
avec xgetbv1 xsaves avx512_bf16 arat
avx512vbmi umip avx512_vbmi2 gfni vaes vp
clmulqdq avx512_vnni avx512_bitalg
avx512_vpopcntdq rdpid cldemote movdiri mov
dir64b fsrm md_clear serialize
arch_capabilities
```
</details>
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