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-rw-r--r--[-rwxr-xr-x]softfloat/s_addMagsF64.c79
1 files changed, 64 insertions, 15 deletions
diff --git a/softfloat/s_addMagsF64.c b/softfloat/s_addMagsF64.c
index d2a5686..25b8f38 100755..100644
--- a/softfloat/s_addMagsF64.c
+++ b/softfloat/s_addMagsF64.c
@@ -1,10 +1,42 @@
-// See LICENSE.SoftFloat for license details.
+/*============================================================================
+
+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, 2016 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 "primitives.h"
#include "internals.h"
#include "specialize.h"
@@ -21,28 +53,35 @@ float64_t
uint_fast64_t sigZ;
union ui64_f64 uZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
expA = expF64UI( uiA );
sigA = fracF64UI( uiA );
expB = expF64UI( uiB );
sigB = fracF64UI( uiB );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
expDiff = expA - expB;
- sigA <<= 9;
- sigB <<= 9;
if ( ! expDiff ) {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ if ( ! expA ) {
+ uiZ = uiA + sigB;
+ goto uiZ;
+ }
if ( expA == 0x7FF ) {
if ( sigA | sigB ) goto propagateNaN;
uiZ = uiA;
goto uiZ;
}
- if ( ! expA ) {
- uiZ =
- packToF64UI(
- signZ, 0, ( uiA + uiB ) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) );
- goto uiZ;
- }
expZ = expA;
- sigZ = UINT64_C( 0x4000000000000000 ) + sigA + sigB;
+ sigZ = UINT64_C( 0x0020000000000000 ) + sigA + sigB;
+ sigZ <<= 9;
} else {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ sigA <<= 9;
+ sigB <<= 9;
if ( expDiff < 0 ) {
if ( expB == 0x7FF ) {
if ( sigB ) goto propagateNaN;
@@ -50,8 +89,12 @@ float64_t
goto uiZ;
}
expZ = expB;
- sigA += expA ? UINT64_C( 0x2000000000000000 ) : sigA;
- sigA = softfloat_shift64RightJam( sigA, - expDiff );
+ if ( expA ) {
+ sigA += UINT64_C( 0x2000000000000000 );
+ } else {
+ sigA <<= 1;
+ }
+ sigA = softfloat_shiftRightJam64( sigA, -expDiff );
} else {
if ( expA == 0x7FF ) {
if ( sigA ) goto propagateNaN;
@@ -59,8 +102,12 @@ float64_t
goto uiZ;
}
expZ = expA;
- sigB += expB ? UINT64_C( 0x2000000000000000 ) : sigB;
- sigB = softfloat_shift64RightJam( sigB, expDiff );
+ if ( expB ) {
+ sigB += UINT64_C( 0x2000000000000000 );
+ } else {
+ sigB <<= 1;
+ }
+ sigB = softfloat_shiftRightJam64( sigB, expDiff );
}
sigZ = UINT64_C( 0x2000000000000000 ) + sigA + sigB;
if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
@@ -69,6 +116,8 @@ float64_t
}
}
return softfloat_roundPackToF64( signZ, expZ, sigZ );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
propagateNaN:
uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
uiZ: