go source for verification 2026-05-22

test/simd/bug2.go

@@ -0,0 +1,69 @@
+// compile
+
+//go:build amd64 && goexperiment.simd
+
+// 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.
+
+// Test case for rematerialization ignoring the register constraint
+// during regalloc's shuffle phase.
+
+package p
+
+import (
+	"simd/archsimd"
+)
+
+func PackComplex(b bool) {
+	for {
+		if b {
+			var indices [4]uint32
+			archsimd.Uint32x4{}.ShiftAllRight(20).Store(&indices)
+			_ = indices[indices[0]]
+		}
+	}
+}
+
+func PackComplex2(x0 uint16, src [][4]float32, b, b2 bool) {
+	var out [][4]byte
+	if b2 {
+		for y := range x0 {
+			row := out[:x0]
+			for x := range row {
+				px := &src[y]
+				if b {
+					var indices [4]uint32
+					fu := archsimd.LoadFloat32x4(px).AsUint32x4()
+					fu.ShiftAllRight(0).Store(nil)
+					entry := archsimd.LoadUint32x4(&[4]uint32{
+						toSrgbTable[indices[0]],
+					})
+					var res [4]uint32
+					entry.ShiftAllRight(19).Store(nil)
+					row[x] = [4]uint8{
+						uint8(res[0]),
+						uint8(res[1]),
+						uint8(res[2]),
+					}
+				} else {
+					row[x] = [4]uint8{
+						float32ToSrgb8(0),
+						float32ToSrgb8(1),
+						float32ToSrgb8(2),
+					}
+				}
+			}
+			out = out[len(out):]
+		}
+	}
+}
+
+var toSrgbTable = [4]uint32{}
+
+func float32ToSrgb8(f float32) uint8 {
+	f = min(0, f)
+	fu := uint32(f)
+	entry := toSrgbTable[fu]
+	return uint8(entry * fu)
+}