1 files changed, 73 insertions, 0 deletions

diff --git a/arch/mips/math-emu/ieee754dp.h b/arch/mips/math-emu/ieee754dp.h
new file mode 100644
index 000000000..b7c43a99a
--- /dev/null
+++ b/arch/mips/math-emu/ieee754dp.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * IEEE754 floating point
+ * double precision internal header file
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ */
+
+#include <linux/compiler.h>
+
+#include "ieee754int.h"
+
+#define assert(expr) ((void)0)
+
+#define DP_EBIAS        1023
+#define DP_EMIN         (-1022)
+#define DP_EMAX         1023
+#define DP_FBITS        52
+#define DP_MBITS        52
+
+#define DP_MBIT(x)      ((u64)1 << (x))
+#define DP_HIDDEN_BIT   DP_MBIT(DP_FBITS)
+#define DP_SIGN_BIT     DP_MBIT(63)
+
+#define DPSIGN(dp)      (dp.sign)
+#define DPBEXP(dp)      (dp.bexp)
+#define DPMANT(dp)      (dp.mant)
+
+static inline int ieee754dp_finite(union ieee754dp x)
+{
+        return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
+}
+
+/* 3bit extended double precision sticky right shift */
+#define XDPSRS(v,rs)    \
+        ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
+
+#define XDPSRSX1() \
+        (xe++, (xm = (xm >> 1) | (xm & 1)))
+
+#define XDPSRS1(v)      \
+        (((v) >> 1) | ((v) & 1))
+
+/* 32bit * 32bit => 64bit unsigned integer multiplication */
+#define DPXMULT(x, y)   ((u64)(x) * (u64)y)
+
+/* convert denormal to normalized with extended exponent */
+#define DPDNORMx(m,e) \
+        while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
+#define DPDNORMX        DPDNORMx(xm, xe)
+#define DPDNORMY        DPDNORMx(ym, ye)
+#define DPDNORMZ        DPDNORMx(zm, ze)
+
+static inline union ieee754dp builddp(int s, int bx, u64 m)
+{
+        union ieee754dp r;
+
+        assert((s) == 0 || (s) == 1);
+        assert((bx) >= DP_EMIN - 1 + DP_EBIAS
+               && (bx) <= DP_EMAX + 1 + DP_EBIAS);
+        assert(((m) >> DP_FBITS) == 0);
+
+        r.sign = s;
+        r.bexp = bx;
+        r.mant = m;
+
+        return r;
+}
+
+extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
+extern union ieee754dp ieee754dp_format(int, int, u64);