Implement (u)i32_to_f8 in softfloat

Author: rbuchner-aril

softfloat/i32_to_f8.c

@@ -0,0 +1,49 @@
+/*============================================================================
+
+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 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 "softfloat.h"
+
+float8_t i32_to_f8( int32_t a )
+{
+  bool sign;
+  uint_fast32_t absA;
+  sign = (a < 0);
+  absA = sign ? -(uint_fast32_t) a : (uint_fast32_t) a;
+  return sign_ui32_to_f8(absA, sign);
+}

softfloat/sign_ui32_to_f8.c

@@ -0,0 +1,63 @@
+/*============================================================================
+
+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 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 "softfloat.h"
+
+float8_t sign_ui32_to_f8( uint32_t absA, bool sign )
+{
+  union ui8_f8 uZ;
+  uint_fast8_t leading_zeros;
+  uint_fast8_t shift_amnt;
+  uint_fast8_t exp;
+
+  if ( ! absA ) {
+    uZ.ui = 0;
+    return uZ.f;
+  }
+  if (absA >= 0x10) {
+    softfloat_raiseFlags(softfloat_flag_overflow | softfloat_flag_inexact );
+    uZ.ui = signInfF8UI(sign);
+    return uZ.f;
+  }
+  leading_zeros = softfloat_countLeadingZeros8[absA];
+  exp = 11 - leading_zeros;
+  shift_amnt = 5 - leading_zeros;
+  uZ.ui = packToF8UI( sign, 0x7, (absA << shift_amnt) & 0xF );
+  return uZ.f;
+}

softfloat/softfloat.h

@@ -103,6 +103,8 @@ void softfloat_raiseFlags( uint_fast8_t );
 /*----------------------------------------------------------------------------
 | Integer-to-floating-point conversion routines.
 *----------------------------------------------------------------------------*/
+float8_t sign_ui32_to_f8( uint32_t, bool );
+float8_t ui32_to_f8( uint32_t );
 float16_t ui32_to_f16( uint32_t );
 float32_t ui32_to_f32( uint32_t );
 float64_t ui32_to_f64( uint32_t );
@@ -121,6 +123,7 @@ float128_t ui64_to_f128( uint64_t );
 #endif
 void ui64_to_extF80M( uint64_t, extFloat80_t * );
 void ui64_to_f128M( uint64_t, float128_t * );
+float8_t i32_to_f8( int32_t );
 float16_t i32_to_f16( int32_t );
 float32_t i32_to_f32( int32_t );
 float64_t i32_to_f64( int32_t );

softfloat/softfloat.mk.in

@@ -140,6 +140,7 @@ softfloat_c_srcs = \
 	f64_to_ui64_r_minMag.c \
 	fall_maxmin.c \
 	fall_reciprocal.c \
+	i32_to_f8.c \
 	i32_to_f128.c \
 	i32_to_f16.c \
 	i32_to_f32.c \
@@ -242,6 +243,8 @@ softfloat_c_srcs = \
 	s_subMagsF32.c \
 	s_subMagsF64.c \
 	s_subM.c \
+	sign_ui32_to_f8.c \
+	ui32_to_f8.c \
 	ui32_to_f128.c \
 	ui32_to_f16.c \
 	ui32_to_f32.c \

softfloat/ui32_to_f8.c

@@ -0,0 +1,45 @@
+/*============================================================================
+
+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 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 "softfloat.h"
+
+float8_t ui32_to_f8( uint32_t a )
+{
+  return sign_ui32_to_f8( a, false);
+}