cmd/compile: add shift optimization test

For #69635

Change-Id: Id5696dc9724c3b3afcd7b60a6994f98c5309eb0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/621755
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Pratt <mpratt@google.com>

diff --git a/test/codegen/issue69635.go b/test/codegen/issue69635.go
new file mode 100644 (file)
index 0000000..de68bf1
--- /dev/null
+++ b/test/codegen/issue69635.go
@@ -0,0 +1,13 @@
+// asmcheck
+
+// Copyright 2024 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 codegen
+
+func calc(a uint64) uint64 {
+       v := a >> 20 & 0x7f
+       // amd64: `SHRQ\s\$17, AX$`, `ANDL\s\$1016, AX$`
+       return v << 3
+}