-\r
-#include <stdbool.h>\r
-#include <stdint.h>\r
-#include "platform.h"\r
-#include "primitives.h"\r
-#include "internals.h"\r
-#include "specialize.h"\r
-#include "softfloat.h"\r
-\r
-float32_t\r
- softfloat_mulAddF32(\r
- int op, uint_fast32_t uiA, uint_fast32_t uiB, uint_fast32_t uiC )\r
-{\r
- bool signA;\r
- int_fast16_t expA;\r
- uint_fast32_t sigA;\r
- bool signB;\r
- int_fast16_t expB;\r
- uint_fast32_t sigB;\r
- bool signC;\r
- int_fast16_t expC;\r
- uint_fast32_t sigC;\r
- bool signProd;\r
- uint_fast32_t magBits, uiZ;\r
- struct exp16_sig32 normExpSig;\r
- int_fast16_t expProd;\r
- uint_fast64_t sigProd;\r
- bool signZ;\r
- int_fast16_t expZ;\r
- uint_fast32_t sigZ;\r
- int_fast16_t expDiff;\r
- uint_fast64_t sigZ64, sigC64;\r
- int shiftCount;\r
- union ui32_f32 uZ;\r
-\r
- signA = signF32UI( uiA );\r
- expA = expF32UI( uiA );\r
- sigA = fracF32UI( uiA );\r
- signB = signF32UI( uiB );\r
- expB = expF32UI( uiB );\r
- sigB = fracF32UI( uiB );\r
- signC = signF32UI( uiC ) ^ ( op == softfloat_mulAdd_subC );\r
- expC = expF32UI( uiC );\r
- sigC = fracF32UI( uiC );\r
- signProd = signA ^ signB ^ ( op == softfloat_mulAdd_subProd );\r
- if ( expA == 0xFF ) {\r
- if ( sigA || ( ( expB == 0xFF ) && sigB ) ) goto propagateNaN_ABC;\r
- magBits = expB | sigB;\r
- goto infProdArg;\r
- }\r
- if ( expB == 0xFF ) {\r
- if ( sigB ) goto propagateNaN_ABC;\r
- magBits = expA | sigA;\r
- goto infProdArg;\r
- }\r
- if ( expC == 0xFF ) {\r
- if ( sigC ) {\r
- uiZ = 0;\r
- goto propagateNaN_ZC;\r
- }\r
- uiZ = uiC;\r
- goto uiZ;\r
- }\r
- if ( ! expA ) {\r
- if ( ! sigA ) goto zeroProd;\r
- normExpSig = softfloat_normSubnormalF32Sig( sigA );\r
- expA = normExpSig.exp;\r
- sigA = normExpSig.sig;\r
- }\r
- if ( ! expB ) {\r
- if ( ! sigB ) goto zeroProd;\r
- normExpSig = softfloat_normSubnormalF32Sig( sigB );\r
- expB = normExpSig.exp;\r
- sigB = normExpSig.sig;\r
- }\r
- expProd = expA + expB - 0x7E;\r
- sigA = ( sigA | 0x00800000 )<<7;\r
- sigB = ( sigB | 0x00800000 )<<7;\r
- sigProd = (uint_fast64_t) sigA * sigB;\r
- if ( sigProd < UINT64_C( 0x2000000000000000 ) ) {\r
- --expProd;\r
- sigProd <<= 1;\r
- }\r
- signZ = signProd;\r
- if ( ! expC ) {\r
- if ( ! sigC ) {\r
- expZ = expProd - 1;\r
- sigZ = softfloat_shortShift64RightJam( sigProd, 31 );\r
- goto roundPack;\r
- }\r
- normExpSig = softfloat_normSubnormalF32Sig( sigC );\r
- expC = normExpSig.exp;\r
- sigC = normExpSig.sig;\r
- }\r
- sigC = ( sigC | 0x00800000 )<<6;\r
- expDiff = expProd - expC;\r
- if ( signProd == signC ) {\r
- if ( expDiff <= 0 ) {\r
- expZ = expC;\r
- sigZ = sigC + softfloat_shift64RightJam( sigProd, 32 - expDiff );\r
- } else {\r
- expZ = expProd;\r
- sigZ64 =\r
- sigProd\r
- + softfloat_shift64RightJam(\r
- (uint_fast64_t) sigC<<32, expDiff );\r
- sigZ = softfloat_shortShift64RightJam( sigZ64, 32 );\r
- }\r
- if ( sigZ < 0x40000000 ) {\r
- --expZ;\r
- sigZ <<= 1;\r
- }\r
- } else {\r
-/*** OPTIMIZE BETTER? ***/\r
- sigC64 = (uint_fast64_t) sigC<<32;\r
- if ( expDiff < 0 ) {\r
- signZ = signC;\r
- expZ = expC;\r
- sigZ64 = sigC64 - softfloat_shift64RightJam( sigProd, - expDiff );\r
- } else if ( ! expDiff ) {\r
- expZ = expProd;\r
- sigZ64 = sigProd - sigC64;\r
- if ( ! sigZ64 ) goto completeCancellation;\r
- if ( sigZ64 & UINT64_C( 0x8000000000000000 ) ) {\r
- signZ ^= 1;\r
- sigZ64 = - sigZ64;\r
- }\r
- } else {\r
- expZ = expProd;\r
- sigZ64 = sigProd - softfloat_shift64RightJam( sigC64, expDiff );\r
- }\r
- shiftCount = softfloat_countLeadingZeros64( sigZ64 ) - 1;\r
- expZ -= shiftCount;\r
- shiftCount -= 32;\r
- if ( shiftCount < 0 ) {\r
- sigZ = softfloat_shortShift64RightJam( sigZ64, - shiftCount );\r
- } else {\r
- sigZ = (uint_fast32_t) sigZ64<<shiftCount;\r
- }\r
- }\r
- roundPack:\r
- return softfloat_roundPackToF32( signZ, expZ, sigZ );\r
- propagateNaN_ABC:\r
- uiZ = softfloat_propagateNaNF32UI( uiA, uiB );\r
- goto propagateNaN_ZC;\r
- infProdArg:\r
- if ( magBits ) {\r
- uiZ = packToF32UI( signProd, 0xFF, 0 );\r
- if ( expC != 0xFF ) goto uiZ;\r
- if ( sigC ) goto propagateNaN_ZC;\r
- if ( signProd == signC ) goto uiZ;\r
- }\r
- invalid:\r
- softfloat_raiseFlags( softfloat_flag_invalid );\r
- uiZ = defaultNaNF32UI;\r
- propagateNaN_ZC:\r
- uiZ = softfloat_propagateNaNF32UI( uiZ, uiC );\r
- goto uiZ;\r
- zeroProd:\r
- uiZ = uiC;\r
- if ( ! ( expC | sigC ) && ( signProd != signC ) ) {\r
- completeCancellation:\r
- uiZ =\r
- packToF32UI( softfloat_roundingMode == softfloat_round_min, 0, 0 );\r
- }\r
- uiZ:\r
- uZ.ui = uiZ;\r
- return uZ.f;\r
-\r
-}\r
-\r
+
+/*============================================================================
+
+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, 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 "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t
+ softfloat_mulAddF32(
+ uint_fast32_t uiA, uint_fast32_t uiB, uint_fast32_t uiC, uint_fast8_t op )
+{
+ bool signA;
+ int_fast16_t expA;
+ uint_fast32_t sigA;
+ bool signB;
+ int_fast16_t expB;
+ uint_fast32_t sigB;
+ bool signC;
+ int_fast16_t expC;
+ uint_fast32_t sigC;
+ bool signProd;
+ uint_fast32_t magBits, uiZ;
+ struct exp16_sig32 normExpSig;
+ int_fast16_t expProd;
+ uint_fast64_t sigProd;
+ bool signZ;
+ int_fast16_t expZ;
+ uint_fast32_t sigZ;
+ int_fast16_t expDiff;
+ uint_fast64_t sig64Z, sig64C;
+ int_fast8_t shiftDist;
+ union ui32_f32 uZ;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ signA = signF32UI( uiA );
+ expA = expF32UI( uiA );
+ sigA = fracF32UI( uiA );
+ signB = signF32UI( uiB );
+ expB = expF32UI( uiB );
+ sigB = fracF32UI( uiB );
+ signC = signF32UI( uiC ) ^ (op == softfloat_mulAdd_subC);
+ expC = expF32UI( uiC );
+ sigC = fracF32UI( uiC );
+ signProd = signA ^ signB ^ (op == softfloat_mulAdd_subProd);
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( expA == 0xFF ) {
+ if ( sigA || ((expB == 0xFF) && sigB) ) goto propagateNaN_ABC;
+ magBits = expB | sigB;
+ goto infProdArg;
+ }
+ if ( expB == 0xFF ) {
+ if ( sigB ) goto propagateNaN_ABC;
+ magBits = expA | sigA;
+ goto infProdArg;
+ }
+ if ( expC == 0xFF ) {
+ if ( sigC ) {
+ uiZ = 0;
+ goto propagateNaN_ZC;
+ }
+ uiZ = uiC;
+ goto uiZ;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( ! expA ) {
+ if ( ! sigA ) goto zeroProd;
+ normExpSig = softfloat_normSubnormalF32Sig( sigA );
+ expA = normExpSig.exp;
+ sigA = normExpSig.sig;
+ }
+ if ( ! expB ) {
+ if ( ! sigB ) goto zeroProd;
+ normExpSig = softfloat_normSubnormalF32Sig( sigB );
+ expB = normExpSig.exp;
+ sigB = normExpSig.sig;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ expProd = expA + expB - 0x7E;
+ sigA = (sigA | 0x00800000)<<7;
+ sigB = (sigB | 0x00800000)<<7;
+ sigProd = (uint_fast64_t) sigA * sigB;
+ if ( sigProd < UINT64_C( 0x2000000000000000 ) ) {
+ --expProd;
+ sigProd <<= 1;
+ }
+ signZ = signProd;
+ if ( ! expC ) {
+ if ( ! sigC ) {
+ expZ = expProd - 1;
+ sigZ = softfloat_shortShiftRightJam64( sigProd, 31 );
+ goto roundPack;
+ }
+ normExpSig = softfloat_normSubnormalF32Sig( sigC );
+ expC = normExpSig.exp;
+ sigC = normExpSig.sig;
+ }
+ sigC = (sigC | 0x00800000)<<6;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ expDiff = expProd - expC;
+ if ( signProd == signC ) {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ if ( expDiff <= 0 ) {
+ expZ = expC;
+ sigZ = sigC + softfloat_shiftRightJam64( sigProd, 32 - expDiff );
+ } else {
+ expZ = expProd;
+ sig64Z =
+ sigProd
+ + softfloat_shiftRightJam64(
+ (uint_fast64_t) sigC<<32, expDiff );
+ sigZ = softfloat_shortShiftRightJam64( sig64Z, 32 );
+ }
+ if ( sigZ < 0x40000000 ) {
+ --expZ;
+ sigZ <<= 1;
+ }
+ } else {
+ /*--------------------------------------------------------------------
+ *--------------------------------------------------------------------*/
+ sig64C = (uint_fast64_t) sigC<<32;
+ if ( expDiff < 0 ) {
+ signZ = signC;
+ expZ = expC;
+ sig64Z = sig64C - softfloat_shiftRightJam64( sigProd, -expDiff );
+ } else if ( ! expDiff ) {
+ expZ = expProd;
+ sig64Z = sigProd - sig64C;
+ if ( ! sig64Z ) goto completeCancellation;
+ if ( sig64Z & UINT64_C( 0x8000000000000000 ) ) {
+ signZ = ! signZ;
+ sig64Z = -sig64Z;
+ }
+ } else {
+ expZ = expProd;
+ sig64Z = sigProd - softfloat_shiftRightJam64( sig64C, expDiff );
+ }
+ shiftDist = softfloat_countLeadingZeros64( sig64Z ) - 1;
+ expZ -= shiftDist;
+ shiftDist -= 32;
+ if ( shiftDist < 0 ) {
+ sigZ = softfloat_shortShiftRightJam64( sig64Z, -shiftDist );
+ } else {
+ sigZ = (uint_fast32_t) sig64Z<<shiftDist;
+ }
+ }
+ roundPack:
+ return softfloat_roundPackToF32( signZ, expZ, sigZ );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ propagateNaN_ABC:
+ uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
+ goto propagateNaN_ZC;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ infProdArg:
+ if ( magBits ) {
+ uiZ = packToF32UI( signProd, 0xFF, 0 );
+ if ( expC != 0xFF ) goto uiZ;
+ if ( sigC ) goto propagateNaN_ZC;
+ if ( signProd == signC ) goto uiZ;
+ }
+ softfloat_raiseFlags( softfloat_flag_invalid );
+ uiZ = defaultNaNF32UI;
+ propagateNaN_ZC:
+ uiZ = softfloat_propagateNaNF32UI( uiZ, uiC );
+ goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ zeroProd:
+ uiZ = uiC;
+ if ( ! (expC | sigC) && (signProd != signC) ) {
+ completeCancellation:
+ uiZ =
+ packToF32UI(
+ (softfloat_roundingMode == softfloat_round_min), 0, 0 );
+ }
+ uiZ:
+ uZ.ui = uiZ;
+ return uZ.f;
+
+}
+
projects / riscv-isa-sim.git / blobdiff