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);