diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index a8cc313b76..397f549ab1 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -3049,20 +3049,18 @@ func walkcompare(n *Node, init *Nodes) *Node {
 	n.Left = walkexpr(n.Left, init)
 	n.Right = walkexpr(n.Right, init)
 
-	// Given interface value l and concrete value r, rewrite
-	//   l == r
-	// into types-equal && data-equal.
+	// Given mixed interface/concrete comparison,
+	// rewrite into types-equal && data-equal.
 	// This is efficient, avoids allocations, and avoids runtime calls.
-	var l, r *Node
-	if n.Left.Type.IsInterface() && !n.Right.Type.IsInterface() {
-		l = n.Left
-		r = n.Right
-	} else if !n.Left.Type.IsInterface() && n.Right.Type.IsInterface() {
-		l = n.Right
-		r = n.Left
-	}
+	if n.Left.Type.IsInterface() != n.Right.Type.IsInterface() {
+		// Preserve side-effects in case of short-circuiting; see #32187.
+		l := cheapexpr(n.Left, init)
+		r := cheapexpr(n.Right, init)
+		// Swap so that l is the interface value and r is the concrete value.
+		if n.Right.Type.IsInterface() {
+			l, r = r, l
+		}
 
-	if l != nil {
 		// Handle both == and !=.
 		eq := n.Op
 		andor := OOROR
diff --git a/test/fixedbugs/issue32187.go b/test/fixedbugs/issue32187.go
new file mode 100644
index 0000000000..9c8c9c26d7
--- /dev/null
+++ b/test/fixedbugs/issue32187.go
@@ -0,0 +1,60 @@
+// run
+
+// Copyright 2019 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.
+
+// short-circuiting interface-to-concrete comparisons
+// will not miss panics
+
+package main
+
+import (
+	"log"
+	"strings"
+)
+
+func main() {
+	var (
+		x interface{}
+		p *int
+		s []int
+		l *interface{}
+		r []*int
+	)
+	tests := []struct {
+		name   string
+		errStr string
+		f      func()
+	}{
+		{"switch case", "", func() {
+			switch x {
+			case x.(*int):
+			}
+		}},
+		{"interface conversion", "", func() { _ = x == x.(error) }},
+		{"type assertion", "", func() { _ = x == x.(*int) }},
+		{"out of bounds", "", func() { _ = x == s[1] }},
+		{"nil pointer dereference #1", "", func() { _ = x == *p }},
+		{"nil pointer dereference #2", "nil pointer dereference", func() { _ = *l == r[0] }},
+	}
+
+	for _, tc := range tests {
+		testFuncShouldPanic(tc.name, tc.errStr, tc.f)
+	}
+}
+
+func testFuncShouldPanic(name, errStr string, f func()) {
+	defer func() {
+		e := recover()
+		if e == nil {
+			log.Fatalf("%s: comparison did not panic\n", name)
+		}
+		if errStr != "" {
+			if !strings.Contains(e.(error).Error(), errStr) {
+				log.Fatalf("%s: wrong panic message\n", name)
+			}
+		}
+	}()
+	f()
+}