Implement f8_madd instruction in softfloat

Author: rbuchner-aril

softfloat/f8_emulation.c

@@ -40,6 +40,18 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "specialize.h"
 #include "softfloat.h"
 
+float8_t f8_emulation_3_operands(float8_t a8, float8_t b8, float8_t c8, float16_t (*operation)(float16_t, float16_t, float16_t)) {
+  uint_fast8_t roundingMode = softfloat_roundingMode;
+  softfloat_roundingMode = softfloat_round_odd;
+  float16_t a16 = f8_to_f16(a8);
+  float16_t b16 = f8_to_f16(b8);
+  float16_t c16 = f8_to_f16(c8);
+  float16_t z16 = operation(a16, b16, c16);
+  softfloat_roundingMode = roundingMode;
+  float8_t z = f16_to_f8(z16);
+  return z;
+}
+
 float8_t f8_emulation_2_operands(float8_t a8, float8_t b8, float16_t (*operation)(float16_t, float16_t)) {
   uint_fast8_t roundingMode = softfloat_roundingMode;
   softfloat_roundingMode = softfloat_round_odd;

softfloat/f8_mulAdd.c

@@ -0,0 +1,46 @@
+/*============================================================================
+
+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 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 <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float8_t f8_mulAdd( float8_t a, float8_t b, float8_t c )
+{
+  return f8_emulation_3_operands(a, b, c, f16_mulAdd);
+}

softfloat/softfloat.h

@@ -151,7 +151,9 @@ float8_t f8_sqrt( float8_t );
 float16_t f8_to_f16( float8_t );
 float8_t f8_sub( float8_t, float8_t );
 float8_t f8_add( float8_t, float8_t );
+float8_t f8_mulAdd( float8_t, float8_t , float8_t );
 
+float8_t f8_emulation_3_operands(float8_t a8, float8_t b8, float8_t c8, float16_t (*operation)(float16_t, float16_t, float16_t));
 float8_t f8_emulation_2_operands(float8_t a8, float8_t b8, float16_t (*operation)(float16_t, float16_t));
 float8_t f8_emulation_1_operand(float8_t a8, float16_t (*operation)(float16_t));
 

softfloat/softfloat.mk.in

@@ -51,6 +51,7 @@ softfloat_c_srcs = \
 	f8_add.c \
 	f8_sub.c \
 	f8_mul.c \
+	f8_mulAdd.c \
 	f8_div.c \
 	f8_sqrt.c \
 	f8_emulation.c \