1 files changed, 63 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_fsp.c b/arch/mips/math-emu/dp_fsp.c
new file mode 100644
index 000000000..be8a929c4
--- /dev/null
+++ b/arch/mips/math-emu/dp_fsp.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* IEEE754 floating point arithmetic
+ * double precision: common utilities
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ */
+
+#include "ieee754sp.h"
+#include "ieee754dp.h"
+
+static inline union ieee754dp ieee754dp_nan_fsp(int xs, u64 xm)
+{
+	return builddp(xs, DP_EMAX + 1 + DP_EBIAS,
+		       xm << (DP_FBITS - SP_FBITS));
+}
+
+union ieee754dp ieee754dp_fsp(union ieee754sp x)
+{
+	COMPXSP;
+
+	EXPLODEXSP;
+
+	ieee754_clearcx();
+
+	FLUSHXSP;
+
+	switch (xc) {
+	case IEEE754_CLASS_SNAN:
+		return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm));
+
+	case IEEE754_CLASS_QNAN:
+		return ieee754dp_nan_fsp(xs, xm);
+
+	case IEEE754_CLASS_INF:
+		return ieee754dp_inf(xs);
+
+	case IEEE754_CLASS_ZERO:
+		return ieee754dp_zero(xs);
+
+	case IEEE754_CLASS_DNORM:
+		/* normalize */
+		while ((xm >> SP_FBITS) == 0) {
+			xm <<= 1;
+			xe--;
+		}
+		break;
+
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+
+	/*
+	 * Can't possibly overflow,underflow, or need rounding
+	 */
+
+	/* drop the hidden bit */
+	xm &= ~SP_HIDDEN_BIT;
+
+	return builddp(xs, xe + DP_EBIAS,
+		       (u64) xm << (DP_FBITS - SP_FBITS));
+}