1 files changed, 37 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/testdata/fma.go b/src/cmd/compile/internal/ssa/testdata/fma.go
new file mode 100644
index 0000000..13a7ff1
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/testdata/fma.go
@@ -0,0 +1,37 @@
+// Copyright 2022 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"
+	"os"
+)
+
+//go:noinline
+func f(x float64) float64 {
+	return x
+}
+
+func inlineFma(x, y, z float64) float64 {
+	return x + y*z
+}
+
+func main() {
+	w, x, y := 1.0, 1.0, 1.0
+	x = f(x + x/(1<<52))
+	w = f(w / (1 << 27))
+	y = f(y + y/(1<<52))
+	w0 := f(2 * w * (1 - w))
+	w1 := f(w * (1 + w))
+	x = x + w0*w1
+	x = inlineFma(x, w0, w1)
+	y = y + f(w0*w1)
+	y = y + f(w0*w1)
+	fmt.Println(x, y, x-y)
+
+	if x != y {
+		os.Exit(1)
+	}
+}