[dev.simd] simd, cmd/compile: move "simd" to "simd/archsimd"

Also removes a few leftover TODOs and scraps of commented-out code
from simd development.

Updated etetest.sh to make it behave whether amd64 implies the
experiment, or not.

Fixes #76473.

Change-Id: I6d9792214d7f514cb90c21b101dbf7d07c1d0e55
Reviewed-on: https://go-review.googlesource.com/c/go/+/728220
TryBot-Bypass: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

1 files changed, 0 insertions, 154 deletions

diff --git a/src/simd/testdata/sample.go b/src/simd/testdata/sample.go
deleted file mode 100644
index b8e3697b6b..0000000000
--- a/src/simd/testdata/sample.go
+++ /dev/null
@@ -1,154 +0,0 @@
-// Copyright 2025 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"fmt"
-	"os"
-	"simd"
-	"unsafe"
-)
-
-func load(s []float64) simd.Float64x4 {
-	return simd.LoadFloat64x4((*[4]float64)(s[:4]))
-}
-
-type S1 = simd.Float64x4
-
-type S2 simd.Float64x4
-
-func (s S2) Len() int {
-	return simd.Float64x4(s).Len()
-}
-
-func (s S2) Load(a []float64) S2 {
-	return S2(load(a))
-}
-
-func (s S2) Store(a *[4]float64) {
-	simd.Float64x4(s).Store(a)
-}
-
-func (s S2) Add(a S2) S2 {
-	return S2(simd.Float64x4(s).Add(simd.Float64x4(a)))
-}
-
-func (s S2) Mul(a S2) S2 {
-	return S2(simd.Float64x4(s).Mul(simd.Float64x4(a)))
-}
-
-type S3 struct {
-	simd.Float64x4
-}
-
-func ip64_0(a, b []float64) float64 {
-	s := 0.0
-	for i := range a {
-		s += a[i] * b[i]
-	}
-	return s
-}
-
-func ip64_1(a, b []float64) float64 {
-	var z S1
-	sum := z
-	var i int
-	stride := z.Len()
-	for ; i <= len(a)-stride; i += stride {
-		va := load(a[i:])
-		vb := load(b[i:])
-		sum = sum.Add(va.Mul(vb))
-	}
-	var tmp [4]float64
-	sum.Store(&tmp)
-	return tmp[0] + tmp[1] + tmp[2] + tmp[3]
-}
-
-func ip64_1a(a, b []float64) float64 {
-	var z S1
-	sum := z
-	var i int
-	stride := z.Len()
-	for ; i <= len(a)-stride; i += stride {
-		va := load(a[i:])
-		vb := load(b[i:])
-		sum = FMA(sum, va, vb)
-	}
-	var tmp [4]float64
-	sum.Store(&tmp)
-	return tmp[0] + tmp[1] + tmp[2] + tmp[3]
-}
-
-//go:noinline
-func FMA(a, b, c simd.Float64x4) simd.Float64x4 {
-	return a.Add(b.Mul(c))
-}
-
-func ip64_2(a, b []float64) float64 {
-	var z S2
-	sum := z
-	var i int
-	stride := z.Len()
-	for ; i <= len(a)-stride; i += stride {
-		va := z.Load(a[i:])
-		vb := z.Load(b[i:])
-		sum = sum.Add(va.Mul(vb))
-	}
-	var tmp [4]float64
-	sum.Store(&tmp)
-	return tmp[0] + tmp[1] + tmp[2] + tmp[3]
-}
-
-func ip64_3(a, b []float64) float64 {
-	var z S3
-	sum := z
-	var i int
-	stride := z.Len()
-	for ; i <= len(a)-stride; i += stride {
-		va := load(a[i:])
-		vb := load(b[i:])
-		sum = S3{sum.Add(va.Mul(vb))}
-	}
-	var tmp [4]float64
-	sum.Store(&tmp)
-	return tmp[0] + tmp[1] + tmp[2] + tmp[3]
-}
-
-func main() {
-	a := []float64{1, 2, 3, 4, 5, 6, 7, 8}
-	ip0 := ip64_0(a, a)
-	ip1 := ip64_1(a, a)
-	ip1a := ip64_1a(a, a)
-	ip2 := ip64_2(a, a)
-	ip3 := ip64_3(a, a)
-	fmt.Printf("Test IP    = %f\n", ip0)
-	fmt.Printf("SIMD IP 1  = %f\n", ip1)
-	fmt.Printf("SIMD IP 1a = %f\n", ip1a)
-	fmt.Printf("SIMD IP 2  = %f\n", ip2)
-	fmt.Printf("SIMD IP 3 = %f\n", ip3)
-	var z1 S1
-	var z2 S2
-	var z3 S2
-
-	s1, s2, s3 := unsafe.Sizeof(z1), unsafe.Sizeof(z2), unsafe.Sizeof(z3)
-
-	fmt.Printf("unsafe.Sizeof(z1, z2, z3)=%d, %d, %d\n", s1, s2, s3)
-
-	fail := false
-
-	if s1 != 32 || s2 != 32 || s3 != 32 {
-		fmt.Println("Failed a sizeof check, should all be 32")
-		fail = true
-	}
-
-	if ip1 != ip0 || ip1a != ip0 || ip2 != ip0 || ip3 != ip0 {
-		fmt.Println("Failed an inner product check, should all be", ip0)
-		fail = true
-	}
-
-	if fail {
-		os.Exit(1)
-	}
-}