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overlay/checksum: test each arch implementation directly

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The correctness sweeps only exercised the public Checksum dispatcher, so
wherever it resolved to the gvisor fallback (non-AVX2 amd64, fallback
architectures) the suite compared gvisor against itself and the AVX2
assembly went untested -- silently green. Per-arch export_test.go files
now enumerate the hand-written implementations and every sweep runs
against the dispatcher plus each of them, skipping with an explicit
message when the running CPU can't execute one.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
JackDoan
2026-07-27 15:55:28 -05:00
parent 8cebecc087
commit 865dc9725c
4 changed files with 132 additions and 64 deletions
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overlay/checksum/export_fallback_test.go
+7
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//go:build !amd64 && !arm64
package checksum
// No hand-written implementations on this architecture; the dispatcher is
// pure gvisor and there is nothing separate to test.
var archImpls []archImpl