Added Berkeley softfloat library

(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
2018-04-24 10:25:37 +02:00
parent fcb04f6141
commit dcaf5467e8
478 changed files with 49447 additions and 0 deletions
--- a/softfloat/source/extF80M_to_f32.c
+++ b/softfloat/source/extF80M_to_f32.c
@ -0,0 +1,112 @@
+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015 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"
+
+#ifdef SOFTFLOAT_FAST_INT64
+
+float32_t extF80M_to_f32( const extFloat80_t *aPtr )
+{
+
+    return extF80_to_f32( *aPtr );
+
+}
+
+#else
+
+float32_t extF80M_to_f32( const extFloat80_t *aPtr )
+{
+    const struct extFloat80M *aSPtr;
+    uint_fast16_t uiA64;
+    bool sign;
+    int32_t exp;
+    uint64_t sig;
+    struct commonNaN commonNaN;
+    uint32_t uiZ, sig32;
+    union ui32_f32 uZ;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    aSPtr = (const struct extFloat80M *) aPtr;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uiA64 = aSPtr->signExp;
+    sign = signExtF80UI64( uiA64 );
+    exp  = expExtF80UI64( uiA64 );
+    sig = aSPtr->signif;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( exp == 0x7FFF ) {
+        if ( sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) {
+            softfloat_extF80MToCommonNaN( aSPtr, &commonNaN );
+            uiZ = softfloat_commonNaNToF32UI( &commonNaN );
+        } else {
+            uiZ = packToF32UI( sign, 0xFF, 0 );
+        }
+        goto uiZ;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) {
+        if ( ! sig ) {
+            uiZ = packToF32UI( sign, 0, 0 );
+            goto uiZ;
+        }
+        exp += softfloat_normExtF80SigM( &sig );
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    sig32 = softfloat_shortShiftRightJam64( sig, 33 );
+    exp -= 0x3F81;
+    if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
+        if ( exp < -0x1000 ) exp = -0x1000;
+    }
+    return softfloat_roundPackToF32( sign, exp, sig32 );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+
+#endif
+