Implement f8_to_(u)i8 in softfloat

Author: rbuchner-aril

softfloat/f8_to_i8.c

@@ -0,0 +1,55 @@
+/*============================================================================
+
+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 "specialize.h"
+#include "softfloat.h"
+
+int_fast8_t f8_to_i8( float8_t a, uint_fast8_t roundingMode, bool exact )
+{
+    uint_fast8_t old_flags = softfloat_exceptionFlags;
+
+    int_fast16_t sig16 = f8_to_i16(a, roundingMode, exact);
+
+    if (sig16 > INT8_MAX) {
+        softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
+        return i8_fromPosOverflow;
+    } else if (sig16 < INT8_MIN) {
+        softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
+        return i8_fromNegOverflow;
+    } else {
+        return sig16;
+    }
+}

softfloat/f8_to_ui8.c

@@ -0,0 +1,52 @@
+/*============================================================================
+
+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 "specialize.h"
+#include "softfloat.h"
+
+uint_fast8_t f8_to_ui8( float8_t a, uint_fast8_t roundingMode, bool exact )
+{
+    uint_fast8_t old_flags = softfloat_exceptionFlags;
+
+    uint_fast16_t sig16 = f8_to_ui16(a, roundingMode, exact);
+
+    if (sig16 > UINT8_MAX) {
+        softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
+        return ui8_fromPosOverflow;
+    } else {
+        return sig16;
+    }
+}

softfloat/softfloat.h

@@ -149,6 +149,8 @@ float8_t f8_rsqrte7( float8_t );
 float8_t f8_recip7( float8_t );
 float8_t f8_sqrt( float8_t );
 float16_t f8_to_f16( float8_t );
+int_fast8_t f8_to_i8( float8_t, uint_fast8_t, bool );
+uint_fast8_t f8_to_ui8( float8_t, uint_fast8_t, bool );
 int_fast16_t f8_to_i16( float8_t, uint_fast8_t, bool );
 uint_fast16_t f8_to_ui16( float8_t, uint_fast8_t, bool );
 float8_t f8_sub( float8_t, float8_t );

softfloat/softfloat.mk.in

@@ -61,6 +61,8 @@ softfloat_c_srcs = \
 	f16_sub.c \
 	f16_to_f8.c \
 	f16_to_f128.c \
+	f8_to_i8.c \
+	f8_to_ui8.c \
 	f8_to_f16.c \
 	f8_to_i16.c \
 	f8_to_ui16.c \