This CL adds a new generator to internal/runtime/gc/scan that generates expander
kernels in Go SIMD. This CL also includes a Go SIMD scan kernel and a
Go SIMD filter kernel.
This CL also includes the plumbing, it will use the Go SIMD kernels if
goexperiment.simd is on.
Benchmark results:
...
ScanSpanPacked/cache=tiny/pages=1/sizeclass=26/pct=80-88 354.8n ± 1% 272.4n ± 0% -23.22% (p=0.002 n=6)
ScanSpanPacked/cache=tiny/pages=1/sizeclass=26/pct=90-88 375.7n ± 0% 287.1n ± 0% -23.58% (p=0.002 n=6)
ScanSpanPacked/cache=tiny/pages=1/sizeclass=26/pct=100-88 450.0n ± 1% 327.4n ± 0% -27.24% (p=0.002 n=6)
geomean 246.5n 199.4n -19.10%
Throughput +25%.
Change-Id: Ib85e01b7de18181db9e7b6026863209a993aa85f
Reviewed-on: https://go-review.googlesource.com/c/go/+/719520
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
2025-11-21 13:14:21 -08:00
Renamed from src/internal/runtime/gc/scan/expand_amd64.go (Browse further)
