diff --git a/src/cmd/7g/prog.go b/src/cmd/7g/prog.go
index 4afb29b89ab..f503f78ef12 100644
--- a/src/cmd/7g/prog.go
+++ b/src/cmd/7g/prog.go
@@ -57,7 +57,7 @@ var progtable = [arm64.ALAST]obj.ProgInfo{
 	arm64.ALSL:   {gc.SizeQ | gc.LeftRead | gc.RegRead | gc.RightWrite, 0, 0, 0},
 	arm64.ALSR:   {gc.SizeQ | gc.LeftRead | gc.RegRead | gc.RightWrite, 0, 0, 0},
 	arm64.AASR:   {gc.SizeQ | gc.LeftRead | gc.RegRead | gc.RightWrite, 0, 0, 0},
-	arm64.ACMP:   {gc.SizeQ | gc.LeftRead | gc.RightRead, 0, 0, 0},
+	arm64.ACMP:   {gc.SizeQ | gc.LeftRead | gc.RegRead, 0, 0, 0},
 
 	// Floating point.
 	arm64.AFADDD: {gc.SizeD | gc.LeftRead | gc.RegRead | gc.RightWrite, 0, 0, 0},
diff --git a/test/fixedbugs/issue10253.go b/test/fixedbugs/issue10253.go
new file mode 100644
index 00000000000..fafca6c733e
--- /dev/null
+++ b/test/fixedbugs/issue10253.go
@@ -0,0 +1,26 @@
+// run
+
+// Copyright 2015 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.
+
+// issue 10253: cmd/7g: bad codegen, probably regopt related
+
+package main
+
+func main() {
+	if !eq() {
+		panic("wrong value")
+	}
+}
+
+var text = "abc"
+var s = &str{text}
+
+func eq() bool {
+	return text[0] == s.text[0]
+}
+
+type str struct {
+	text string
+}