56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package verify
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import (
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"os"
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"os/exec"
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"testing"
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)
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// goobjVectorMainSrc is the Go side of the vector regression. The kernel
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// computes a signed byte checksum through the RVV load/store and arithmetic
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// families; main derives the same value in Go and panics on any divergence
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// before printing the deterministic line the baseline and the gasm-linked
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// binaries must agree on.
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const goobjVectorMainSrc = `package main
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func checksum(buf []byte, seed int64) int64
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func main() {
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buf := []byte("gasm link parity vector kernel!")
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total := int64(0)
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for _, b := range buf {
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total += int64(int8(b))
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}
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want := total*0x0101010101010101 ^ 0x5eed
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if got := checksum(buf, 0x5eed); got != want {
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panic("checksum")
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}
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println("ok", checksum(buf, 0x5eed))
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}
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`
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// TestGOOBJLinkRVVKernel proves the riscv64 vector families merged into the
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// encoder corpus are proven end to end: the kernel assembles by gasm into a
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// GOOBJ object, substitutes byte-wise into a real go build archive, relinks
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// with cmd/link and the linked binary computes the same checksum as the
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// toolchain-built one under qemu-user. The reduction reads the live vl, so
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// the checksum holds for any hardware VLEN.
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func TestGOOBJLinkRVVKernel(t *testing.T) {
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if testing.Short() {
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t.Skip("builds the gasm binary and links Go programs")
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}
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if os.Getenv("GASM_LINK_PARITY") == "" {
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t.Skip("deliberate verification: set GASM_LINK_PARITY=1 (just link-parity)")
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}
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goBin, err := exec.LookPath("go")
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if err != nil {
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t.Skip("no Go toolchain available")
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}
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gasmBin := buildLinkParityGasm(t, goBin)
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t.Run("riscv64", func(t *testing.T) {
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goobjLinkKernel(t, goBin, gasmBin, "riscv64", "linkvec_riscv64.s", goobjVectorMainSrc)
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})
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}
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