1 files changed, 20 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/asinf.c b/winsup/mingw/mingwex/math/asinf.c
new file mode 100644
index 000000000..e79429ec8
--- /dev/null
+++ b/winsup/mingw/mingwex/math/asinf.c
@@ -0,0 +1,20 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Public domain.
+ */
+
+/* asin = atan (x / sqrt(1 - x^2)) */
+
+float asinf (float x)
+{
+  float res;
+
+  asm (	"fld	%%st\n\t"
+	"fmul	%%st(0)\n\t"			/* x^2 */
+	"fld1\n\t"
+	"fsubp\n\t"				/* 1 - x^2 */
+	"fsqrt\n\t"				/* sqrt (1 - x^2) */
+	"fpatan"
+	: "=t" (res) : "0" (x) : "st(1)");
+  return res;
+}