1 files changed, 78 insertions, 0 deletions

diff --git a/arch/mips/math-emu/dp_rint.c b/arch/mips/math-emu/dp_rint.c
new file mode 100644
index 000000000..7f30b7a30
--- /dev/null
+++ b/arch/mips/math-emu/dp_rint.c
@@ -0,0 +1,78 @@
+// 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.
+ * Copyright (C) 2017 Imagination Technologies, Ltd.
+ * Author: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
+ */
+
+#include "ieee754dp.h"
+
+union ieee754dp ieee754dp_rint(union ieee754dp x)
+{
+        union ieee754dp ret;
+        u64 residue;
+        int sticky;
+        int round;
+        int odd;
+
+        COMPXDP;
+
+        ieee754_clearcx();
+
+        EXPLODEXDP;
+        FLUSHXDP;
+
+        if (xc == IEEE754_CLASS_SNAN)
+                return ieee754dp_nanxcpt(x);
+
+        if ((xc == IEEE754_CLASS_QNAN) ||
+            (xc == IEEE754_CLASS_INF) ||
+            (xc == IEEE754_CLASS_ZERO))
+                return x;
+
+        if (xe >= DP_FBITS)
+                return x;
+
+        if (xe < -1) {
+                residue = xm;
+                round = 0;
+                sticky = residue != 0;
+                xm = 0;
+        } else {
+                residue = xm << (64 - DP_FBITS + xe);
+                round = (residue >> 63) != 0;
+                sticky = (residue << 1) != 0;
+                xm >>= DP_FBITS - xe;
+        }
+
+        odd = (xm & 0x1) != 0x0;
+
+        switch (ieee754_csr.rm) {
+        case FPU_CSR_RN:        /* toward nearest */
+                if (round && (sticky || odd))
+                        xm++;
+                break;
+        case FPU_CSR_RZ:        /* toward zero */
+                break;
+        case FPU_CSR_RU:        /* toward +infinity */
+                if ((round || sticky) && !xs)
+                        xm++;
+                break;
+        case FPU_CSR_RD:        /* toward -infinity */
+                if ((round || sticky) && xs)
+                        xm++;
+                break;
+        }
+
+        if (round || sticky)
+                ieee754_setcx(IEEE754_INEXACT);
+
+        ret = ieee754dp_flong(xm);
+        DPSIGN(ret) = xs;
+
+        return ret;
+}