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/f64_to_f128M.c
+++ b/softfloat/source/f64_to_f128M.c
@ -0,0 +1,117 @@
+
+/*============================================================================
+
+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 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
+
+void f64_to_f128M( float64_t a, float128_t *zPtr )
+{
+
+    *zPtr = f64_to_f128( a );
+
+}
+
+#else
+
+void f64_to_f128M( float64_t a, float128_t *zPtr )
+{
+    uint32_t *zWPtr;
+    union ui64_f64 uA;
+    uint64_t uiA;
+    bool sign;
+    int_fast16_t exp;
+    uint64_t frac;
+    struct commonNaN commonNaN;
+    uint32_t uiZ96;
+    struct exp16_sig64 normExpSig;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    zWPtr = (uint32_t *) zPtr;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uA.f = a;
+    uiA = uA.ui;
+    sign = signF64UI( uiA );
+    exp  = expF64UI( uiA );
+    frac = fracF64UI( uiA );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    zWPtr[indexWord( 4, 0 )] = 0;
+    if ( exp == 0x7FF ) {
+        if ( frac ) {
+            softfloat_f64UIToCommonNaN( uiA, &commonNaN );
+            softfloat_commonNaNToF128M( &commonNaN, zWPtr );
+            return;
+        }
+        uiZ96 = packToF128UI96( sign, 0x7FFF, 0 );
+        goto uiZ;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! exp ) {
+        if ( ! frac ) {
+            uiZ96 = packToF128UI96( sign, 0, 0 );
+            goto uiZ;
+        }
+        normExpSig = softfloat_normSubnormalF64Sig( frac );
+        exp = normExpSig.exp - 1;
+        frac = normExpSig.sig;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    zWPtr[indexWord( 4, 1 )] = (uint32_t) frac<<28;
+    frac >>= 4;
+    zWPtr[indexWordHi( 4 )] = packToF128UI96( sign, exp + 0x3C00, frac>>32 );
+    zWPtr[indexWord( 4, 2 )] = frac;
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ uiZ:
+    zWPtr[indexWord( 4, 3 )] = uiZ96;
+    zWPtr[indexWord( 4, 2 )] = 0;
+    zWPtr[indexWord( 4, 1 )] = 0;
+
+}
+
+#endif
+