Upgrade to SoftFloat 3e

1 files changed, 109 insertions, 0 deletions

diff --git a/softfloat/f128_to_extF80.c b/softfloat/f128_to_extF80.c
new file mode 100644
index 0000000..cb0a6ce
--- /dev/null
+++ b/softfloat/f128_to_extF80.c
@@ -0,0 +1,109 @@
+
+/*============================================================================
+
+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"
+
+extFloat80_t f128_to_extF80( float128_t a )
+{
+    union ui128_f128 uA;
+    uint_fast64_t uiA64, uiA0;
+    bool sign;
+    int_fast32_t exp;
+    uint_fast64_t frac64, frac0;
+    struct commonNaN commonNaN;
+    struct uint128 uiZ;
+    uint_fast16_t uiZ64;
+    uint_fast64_t uiZ0;
+    struct exp32_sig128 normExpSig;
+    struct uint128 sig128;
+    union { struct extFloat80M s; extFloat80_t f; } uZ;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uA.f = a;
+    uiA64 = uA.ui.v64;
+    uiA0  = uA.ui.v0;
+    sign   = signF128UI64( uiA64 );
+    exp    = expF128UI64( uiA64 );
+    frac64 = fracF128UI64( uiA64 );
+    frac0  = uiA0;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( exp == 0x7FFF ) {
+        if ( frac64 | frac0 ) {
+            softfloat_f128UIToCommonNaN( uiA64, uiA0, &commonNaN );
+            uiZ = softfloat_commonNaNToExtF80UI( &commonNaN );
+            uiZ64 = uiZ.v64;
+            uiZ0  = uiZ.v0;
+        } else {
+            uiZ64 = packToExtF80UI64( sign, 0x7FFF );
+            uiZ0  = UINT64_C( 0x8000000000000000 );
+        }
+        goto uiZ;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! exp ) {
+        if ( ! (frac64 | frac0) ) {
+            uiZ64 = packToExtF80UI64( sign, 0 );
+            uiZ0  = 0;
+            goto uiZ;
+        }
+        normExpSig = softfloat_normSubnormalF128Sig( frac64, frac0 );
+        exp   = normExpSig.exp;
+        frac64 = normExpSig.sig.v64;
+        frac0  = normExpSig.sig.v0;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    sig128 =
+        softfloat_shortShiftLeft128(
+            frac64 | UINT64_C( 0x0001000000000000 ), frac0, 15 );
+    return softfloat_roundPackToExtF80( sign, exp, sig128.v64, sig128.v0, 80 );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ uiZ:
+    uZ.s.signExp = uiZ64;
+    uZ.s.signif  = uiZ0;
+    return uZ.f;
+
+}
+