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_mul.c
+++ b/softfloat/source/extF80M_mul.c
@ -0,0 +1,139 @@
+
+/*============================================================================
+
+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
+ extF80M_mul(
+     const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr )
+{
+
+    *zPtr = extF80_mul( *aPtr, *bPtr );
+
+}
+
+#else
+
+void
+ extF80M_mul(
+     const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr )
+{
+    const struct extFloat80M *aSPtr, *bSPtr;
+    struct extFloat80M *zSPtr;
+    uint_fast16_t uiA64;
+    int32_t expA;
+    uint_fast16_t uiB64;
+    int32_t expB;
+    bool signZ;
+    uint_fast16_t exp, uiZ64;
+    uint64_t uiZ0, sigA, sigB;
+    int32_t expZ;
+    uint32_t sigProd[4], *extSigZPtr;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    aSPtr = (const struct extFloat80M *) aPtr;
+    bSPtr = (const struct extFloat80M *) bPtr;
+    zSPtr = (struct extFloat80M *) zPtr;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uiA64 = aSPtr->signExp;
+    expA = expExtF80UI64( uiA64 );
+    uiB64 = bSPtr->signExp;
+    expB = expExtF80UI64( uiB64 );
+    signZ = signExtF80UI64( uiA64 ) ^ signExtF80UI64( uiB64 );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
+        if ( softfloat_tryPropagateNaNExtF80M( aSPtr, bSPtr, zSPtr ) ) return;
+        if (
+               (! aSPtr->signif && (expA != 0x7FFF))
+            || (! bSPtr->signif && (expB != 0x7FFF))
+        ) {
+            softfloat_invalidExtF80M( zSPtr );
+            return;
+        }
+        uiZ64 = packToExtF80UI64( signZ, 0x7FFF );
+        uiZ0  = UINT64_C( 0x8000000000000000 );
+        goto uiZ;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! expA ) expA = 1;
+    sigA = aSPtr->signif;
+    if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
+        if ( ! sigA ) goto zero;
+        expA += softfloat_normExtF80SigM( &sigA );
+    }
+    if ( ! expB ) expB = 1;
+    sigB = bSPtr->signif;
+    if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) {
+        if ( ! sigB ) goto zero;
+        expB += softfloat_normExtF80SigM( &sigB );
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expZ = expA + expB - 0x3FFE;
+    softfloat_mul64To128M( sigA, sigB, sigProd );
+    if ( sigProd[indexWordLo( 4 )] ) sigProd[indexWord( 4, 1 )] |= 1;
+    extSigZPtr = &sigProd[indexMultiwordHi( 4, 3 )];
+    if ( sigProd[indexWordHi( 4 )] < 0x80000000 ) {
+        --expZ;
+        softfloat_add96M( extSigZPtr, extSigZPtr, extSigZPtr );
+    }
+    softfloat_roundPackMToExtF80M(
+        signZ, expZ, extSigZPtr, extF80_roundingPrecision, zSPtr );
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ zero:
+    uiZ64 = packToExtF80UI64( signZ, 0 );
+    uiZ0  = 0;
+ uiZ:
+    zSPtr->signExp = uiZ64;
+    zSPtr->signif  = uiZ0;
+
+}
+
+#endif
+