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));
+}