Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

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);
+}