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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/mips/math-emu/sp_fdp.c
Initial import
Diffstat (limited to 'arch/mips/math-emu/sp_fdp.c')
-rw-r--r--arch/mips/math-emu/sp_fdp.c82
1 files changed, 82 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..379714889
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+++ b/arch/mips/math-emu/sp_fdp.c
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+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#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:
+ return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm));
+
+ case IEEE754_CLASS_QNAN:
+ y = ieee754sp_nan_fdp(xs, xm);
+ 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);
+}