1 files changed, 119 insertions, 0 deletions
diff --git a/test/fixedbugs/issue43619.go b/test/fixedbugs/issue43619.go
new file mode 100644
index 0000000000..3e667851a4
--- /dev/null
+++ b/test/fixedbugs/issue43619.go
@@ -0,0 +1,119 @@
+// run
+
+// Copyright 2021 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"
+	"math"
+)
+
+//go:noinline
+func fcmplt(a, b float64, x uint64) uint64 {
+	if a < b {
+		x = 0
+	}
+	return x
+}
+
+//go:noinline
+func fcmple(a, b float64, x uint64) uint64 {
+	if a <= b {
+		x = 0
+	}
+	return x
+}
+
+//go:noinline
+func fcmpgt(a, b float64, x uint64) uint64 {
+	if a > b {
+		x = 0
+	}
+	return x
+}
+
+//go:noinline
+func fcmpge(a, b float64, x uint64) uint64 {
+	if a >= b {
+		x = 0
+	}
+	return x
+}
+
+//go:noinline
+func fcmpeq(a, b float64, x uint64) uint64 {
+	if a == b {
+		x = 0
+	}
+	return x
+}
+
+//go:noinline
+func fcmpne(a, b float64, x uint64) uint64 {
+	if a != b {
+		x = 0
+	}
+	return x
+}
+
+func main() {
+	type fn func(a, b float64, x uint64) uint64
+
+	type testCase struct {
+		f       fn
+		a, b    float64
+		x, want uint64
+	}
+	NaN := math.NaN()
+	for _, t := range []testCase{
+		{fcmplt, 1.0, 1.0, 123, 123},
+		{fcmple, 1.0, 1.0, 123, 0},
+		{fcmpgt, 1.0, 1.0, 123, 123},
+		{fcmpge, 1.0, 1.0, 123, 0},
+		{fcmpeq, 1.0, 1.0, 123, 0},
+		{fcmpne, 1.0, 1.0, 123, 123},
+
+		{fcmplt, 1.0, 2.0, 123, 0},
+		{fcmple, 1.0, 2.0, 123, 0},
+		{fcmpgt, 1.0, 2.0, 123, 123},
+		{fcmpge, 1.0, 2.0, 123, 123},
+		{fcmpeq, 1.0, 2.0, 123, 123},
+		{fcmpne, 1.0, 2.0, 123, 0},
+
+		{fcmplt, 2.0, 1.0, 123, 123},
+		{fcmple, 2.0, 1.0, 123, 123},
+		{fcmpgt, 2.0, 1.0, 123, 0},
+		{fcmpge, 2.0, 1.0, 123, 0},
+		{fcmpeq, 2.0, 1.0, 123, 123},
+		{fcmpne, 2.0, 1.0, 123, 0},
+
+		{fcmplt, 1.0, NaN, 123, 123},
+		{fcmple, 1.0, NaN, 123, 123},
+		{fcmpgt, 1.0, NaN, 123, 123},
+		{fcmpge, 1.0, NaN, 123, 123},
+		{fcmpeq, 1.0, NaN, 123, 123},
+		{fcmpne, 1.0, NaN, 123, 0},
+
+		{fcmplt, NaN, 1.0, 123, 123},
+		{fcmple, NaN, 1.0, 123, 123},
+		{fcmpgt, NaN, 1.0, 123, 123},
+		{fcmpge, NaN, 1.0, 123, 123},
+		{fcmpeq, NaN, 1.0, 123, 123},
+		{fcmpne, NaN, 1.0, 123, 0},
+
+		{fcmplt, NaN, NaN, 123, 123},
+		{fcmple, NaN, NaN, 123, 123},
+		{fcmpgt, NaN, NaN, 123, 123},
+		{fcmpge, NaN, NaN, 123, 123},
+		{fcmpeq, NaN, NaN, 123, 123},
+		{fcmpne, NaN, NaN, 123, 0},
+	} {
+		got := t.f(t.a, t.b, t.x)
+		if got != t.want {
+			panic(fmt.Sprintf("want %v, got %v", t.want, got))
+		}
+	}
+}