1 files changed, 28 insertions, 0 deletions
diff --git a/libgo/go/math/sqrt.go b/libgo/go/math/sqrt.go
new file mode 100644
index 000000000..bf6ef64a0
--- /dev/null
+++ b/libgo/go/math/sqrt.go
@@ -0,0 +1,28 @@
+// Copyright 2009 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 math
+
+func libc_sqrt(float64) float64 __asm__("sqrt")
+
+// Sqrt returns the square root of x.
+//
+// Special cases are:
+//	Sqrt(+Inf) = +Inf
+//	Sqrt(±0) = ±0
+//	Sqrt(x < 0) = NaN
+//	Sqrt(NaN) = NaN
+func Sqrt(x float64) float64 {
+	// special cases
+	// TODO(rsc): Remove manual inlining of IsNaN, IsInf
+	// when compiler does it for us
+	switch {
+	case x == 0 || x != x || x > MaxFloat64: // x == 0 || IsNaN(x) || IsInf(x, 1):
+		return x
+	case x < 0:
+		return NaN()
+	}
+
+	return libc_sqrt(x)
+}