sf: add f32_to_[u]i16

leverage f32_to_[u]i16 and handle overflow cast for 16 bit
integer range

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

4 files changed, 114 insertions, 0 deletions

diff --git a/softfloat/f32_to_i16.c b/softfloat/f32_to_i16.c
new file mode 100644
index 0000000..3ec0658
--- /dev/null
+++ b/softfloat/f32_to_i16.c
@@ -0,0 +1,57 @@
+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3d, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
+University of California.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions, and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+    be used to endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+int_fast16_t f32_to_i16( float32_t a, uint_fast8_t roundingMode, bool exact )
+{
+    int_fast32_t sig32 = f32_to_i32(a, roundingMode, exact);
+
+    if (sig32 > INT16_MAX) {
+        softfloat_exceptionFlags |= softfloat_flag_invalid;
+        return i16_fromPosOverflow;
+    } else if (sig32 < INT16_MIN) {
+        softfloat_exceptionFlags |= softfloat_flag_invalid;
+        return i16_fromNegOverflow;
+    } else {
+        return sig32;
+    }
+}
+
diff --git a/softfloat/f32_to_ui16.c b/softfloat/f32_to_ui16.c
new file mode 100644
index 0000000..16b8a4d
--- /dev/null
+++ b/softfloat/f32_to_ui16.c
@@ -0,0 +1,53 @@
+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3d, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
+University of California.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions, and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+    be used to endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+uint_fast16_t f32_to_ui16( float32_t a, uint_fast8_t roundingMode, bool exact )
+{
+    uint_fast32_t sig32 = f32_to_ui32(a, roundingMode, exact);
+
+    if (sig32 > UINT16_MAX) {
+        softfloat_exceptionFlags |= softfloat_flag_invalid;
+        return ui16_fromPosOverflow;
+    } else {
+        return sig32;
+    }
+}
diff --git a/softfloat/softfloat.h b/softfloat/softfloat.h
index c93c3c5..5579c68 100644
--- a/softfloat/softfloat.h
+++ b/softfloat/softfloat.h
@@ -181,8 +181,10 @@ uint_fast16_t f16_classify( float16_t );
 /*----------------------------------------------------------------------------
 | 32-bit (single-precision) floating-point operations.
 *----------------------------------------------------------------------------*/
+uint_fast16_t f32_to_ui16( float32_t, uint_fast8_t, bool );
 uint_fast32_t f32_to_ui32( float32_t, uint_fast8_t, bool );
 uint_fast64_t f32_to_ui64( float32_t, uint_fast8_t, bool );
+int_fast16_t f32_to_i16( float32_t, uint_fast8_t, bool );
 int_fast32_t f32_to_i32( float32_t, uint_fast8_t, bool );
 int_fast64_t f32_to_i64( float32_t, uint_fast8_t, bool );
 uint_fast32_t f32_to_ui32_r_minMag( float32_t, bool );
diff --git a/softfloat/softfloat.mk.in b/softfloat/softfloat.mk.in
index 90ce30c..56fc560 100644
--- a/softfloat/softfloat.mk.in
+++ b/softfloat/softfloat.mk.in
@@ -85,10 +85,12 @@ softfloat_c_srcs = \
 	f32_to_f128.c \
 	f32_to_f16.c \
 	f32_to_f64.c \
+	f32_to_i16.c \
 	f32_to_i32.c \
 	f32_to_i32_r_minMag.c \
 	f32_to_i64.c \
 	f32_to_i64_r_minMag.c \
+	f32_to_ui16.c \
 	f32_to_ui32.c \
 	f32_to_ui32_r_minMag.c \
 	f32_to_ui64.c \