+/*============================================================================
+
+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"
bool signZ;
struct exp16_sig32 normExpSig;
int_fast16_t expZ;
+#ifdef SOFTFLOAT_FAST_DIV64TO32
+ uint_fast64_t sig64A;
uint_fast32_t sigZ;
+#else
+ uint_fast32_t sigZ;
+ uint_fast64_t rem;
+#endif
uint_fast32_t uiZ;
union ui32_f32 uZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
uA.f = a;
uiA = uA.ui;
signA = signF32UI( uiA );
- expA = expF32UI( uiA );
- sigA = fracF32UI( uiA );
+ expA = expF32UI( uiA );
+ sigA = fracF32UI( uiA );
uB.f = b;
uiB = uB.ui;
signB = signF32UI( uiB );
- expB = expF32UI( uiB );
- sigB = fracF32UI( uiB );
+ expB = expF32UI( uiB );
+ sigB = fracF32UI( uiB );
signZ = signA ^ signB;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
if ( expA == 0xFF ) {
if ( sigA ) goto propagateNaN;
if ( expB == 0xFF ) {
if ( sigB ) goto propagateNaN;
goto zero;
}
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
if ( ! expB ) {
if ( ! sigB ) {
- if ( ! ( expA | sigA ) ) goto invalid;
- softfloat_raiseFlags( softfloat_flag_infinity );
+ if ( ! (expA | sigA) ) goto invalid;
+ softfloat_raiseFlags( softfloat_flag_infinite );
goto infinity;
}
normExpSig = softfloat_normSubnormalF32Sig( sigB );
expA = normExpSig.exp;
sigA = normExpSig.sig;
}
- expZ = expA - expB + 0x7D;
- sigA = ( sigA | 0x00800000 )<<7;
- sigB = ( sigB | 0x00800000 )<<8;
- if ( sigB <= ( sigA + sigA ) ) {
- ++expZ;
- sigA >>= 1;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ expZ = expA - expB + 0x7E;
+ sigA |= 0x00800000;
+ sigB |= 0x00800000;
+#ifdef SOFTFLOAT_FAST_DIV64TO32
+ if ( sigA < sigB ) {
+ --expZ;
+ sig64A = (uint_fast64_t) sigA<<31;
+ } else {
+ sig64A = (uint_fast64_t) sigA<<30;
+ }
+ sigZ = sig64A / sigB;
+ if ( ! (sigZ & 0x3F) ) sigZ |= ((uint_fast64_t) sigB * sigZ != sig64A);
+#else
+ if ( sigA < sigB ) {
+ --expZ;
+ sigA <<= 8;
+ } else {
+ sigA <<= 7;
}
- sigZ = ( (uint_fast64_t) sigA<<32 ) / sigB;
- if ( ! ( sigZ & 0x3F ) ) {
- sigZ |= ( (uint_fast64_t) sigB * sigZ != (uint_fast64_t) sigA<<32 );
+ sigB <<= 8;
+ sigZ = ((uint_fast64_t) sigA * softfloat_approxRecip32_1( sigB ))>>32;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ sigZ += 2;
+ if ( (sigZ & 0x3F) < 2 ) {
+ sigZ &= ~3;
+#ifdef SOFTFLOAT_FAST_INT64
+ rem = ((uint_fast64_t) sigA<<31) - (uint_fast64_t) sigZ * sigB;
+#else
+ rem = ((uint_fast64_t) sigA<<32) - (uint_fast64_t) (sigZ<<1) * sigB;
+#endif
+ if ( rem & UINT64_C( 0x8000000000000000 ) ) {
+ sigZ -= 4;
+ } else {
+ if ( rem ) sigZ |= 1;
+ }
}
+#endif
return softfloat_roundPackToF32( signZ, expZ, sigZ );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
propagateNaN:
uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
invalid:
softfloat_raiseFlags( softfloat_flag_invalid );
uiZ = defaultNaNF32UI;
goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
infinity:
uiZ = packToF32UI( signZ, 0xFF, 0 );
goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
zero:
uiZ = packToF32UI( signZ, 0, 0 );
uiZ:
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