1 files changed, 73 insertions, 0 deletions
diff --git a/arch/mips/math-emu/sp_fdp.c b/arch/mips/math-emu/sp_fdp.c
new file mode 100644
index 000000000..56417497c
--- /dev/null
+++ b/arch/mips/math-emu/sp_fdp.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ */
+
+#include "ieee754sp.h"
+#include "ieee754dp.h"
+
+static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm)
+{
+	return buildsp(xs, SP_EMAX + 1 + SP_EBIAS,
+		       xm >> (DP_FBITS - SP_FBITS));
+}
+
+union ieee754sp ieee754sp_fdp(union ieee754dp x)
+{
+	union ieee754sp y;
+	u32 rm;
+
+	COMPXDP;
+	COMPYSP;
+
+	EXPLODEXDP;
+
+	ieee754_clearcx();
+
+	FLUSHXDP;
+
+	switch (xc) {
+	case IEEE754_CLASS_SNAN:
+		x = ieee754dp_nanxcpt(x);
+		EXPLODEXDP;
+		fallthrough;
+	case IEEE754_CLASS_QNAN:
+		y = ieee754sp_nan_fdp(xs, xm);
+		if (!ieee754_csr.nan2008) {
+			EXPLODEYSP;
+			if (!ieee754_class_nan(yc))
+				y = ieee754sp_indef();
+		}
+		return y;
+
+	case IEEE754_CLASS_INF:
+		return ieee754sp_inf(xs);
+
+	case IEEE754_CLASS_ZERO:
+		return ieee754sp_zero(xs);
+
+	case IEEE754_CLASS_DNORM:
+		/* can't possibly be sp representable */
+		ieee754_setcx(IEEE754_UNDERFLOW);
+		ieee754_setcx(IEEE754_INEXACT);
+		if ((ieee754_csr.rm == FPU_CSR_RU && !xs) ||
+				(ieee754_csr.rm == FPU_CSR_RD && xs))
+			return ieee754sp_mind(xs);
+		return ieee754sp_zero(xs);
+
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+
+	/*
+	 * Convert from DP_FBITS to SP_FBITS+3 with sticky right shift.
+	 */
+	rm = (xm >> (DP_FBITS - (SP_FBITS + 3))) |
+	     ((xm << (64 - (DP_FBITS - (SP_FBITS + 3)))) != 0);
+
+	return ieee754sp_format(xs, xe, rm);
+}