-\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 f32_mul( float32_t a, float32_t b )\r
-{\r
- union ui32_f32 uA;\r
- uint_fast32_t uiA;\r
- bool signA;\r
- int_fast16_t expA;\r
- uint_fast32_t sigA;\r
- union ui32_f32 uB;\r
- uint_fast32_t uiB;\r
- bool signB;\r
- int_fast16_t expB;\r
- uint_fast32_t sigB;\r
- bool signZ;\r
- uint_fast32_t magBits;\r
- struct exp16_sig32 normExpSig;\r
- int_fast16_t expZ;\r
- uint_fast32_t sigZ, uiZ;\r
- union ui32_f32 uZ;\r
-\r
- uA.f = a;\r
- uiA = uA.ui;\r
- signA = signF32UI( uiA );\r
- expA = expF32UI( uiA );\r
- sigA = fracF32UI( uiA );\r
- uB.f = b;\r
- uiB = uB.ui;\r
- signB = signF32UI( uiB );\r
- expB = expF32UI( uiB );\r
- sigB = fracF32UI( uiB );\r
- signZ = signA ^ signB;\r
- if ( expA == 0xFF ) {\r
- if ( sigA || ( ( expB == 0xFF ) && sigB ) ) goto propagateNaN;\r
- magBits = expB | sigB;\r
- goto infArg;\r
- }\r
- if ( expB == 0xFF ) {\r
- if ( sigB ) goto propagateNaN;\r
- magBits = expA | sigA;\r
- goto infArg;\r
- }\r
- if ( ! expA ) {\r
- if ( ! sigA ) goto zero;\r
- normExpSig = softfloat_normSubnormalF32Sig( sigA );\r
- expA = normExpSig.exp;\r
- sigA = normExpSig.sig;\r
- }\r
- if ( ! expB ) {\r
- if ( ! sigB ) goto zero;\r
- normExpSig = softfloat_normSubnormalF32Sig( sigB );\r
- expB = normExpSig.exp;\r
- sigB = normExpSig.sig;\r
- }\r
- expZ = expA + expB - 0x7F;\r
- sigA = ( sigA | 0x00800000 )<<7;\r
- sigB = ( sigB | 0x00800000 )<<8;\r
- sigZ = softfloat_shortShift64RightJam( (uint_fast64_t) sigA * sigB, 32 );\r
- if ( sigZ < 0x40000000 ) {\r
- --expZ;\r
- sigZ <<= 1;\r
- }\r
- return softfloat_roundPackToF32( signZ, expZ, sigZ );\r
- propagateNaN:\r
- uiZ = softfloat_propagateNaNF32UI( uiA, uiB );\r
- goto uiZ;\r
- infArg:\r
- if ( ! magBits ) {\r
- softfloat_raiseFlags( softfloat_flag_invalid );\r
- uiZ = defaultNaNF32UI;\r
- } else {\r
- uiZ = packToF32UI( signZ, 0xFF, 0 );\r
- }\r
- goto uiZ;\r
- zero:\r
- uiZ = packToF32UI( signZ, 0, 0 );\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 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 f32_mul( float32_t a, float32_t b )
+{
+ union ui32_f32 uA;
+ uint_fast32_t uiA;
+ bool signA;
+ int_fast16_t expA;
+ uint_fast32_t sigA;
+ union ui32_f32 uB;
+ uint_fast32_t uiB;
+ bool signB;
+ int_fast16_t expB;
+ uint_fast32_t sigB;
+ bool signZ;
+ uint_fast32_t magBits;
+ struct exp16_sig32 normExpSig;
+ int_fast16_t expZ;
+ uint_fast32_t sigZ, uiZ;
+ union ui32_f32 uZ;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ uA.f = a;
+ uiA = uA.ui;
+ signA = signF32UI( uiA );
+ expA = expF32UI( uiA );
+ sigA = fracF32UI( uiA );
+ uB.f = b;
+ uiB = uB.ui;
+ signB = signF32UI( uiB );
+ expB = expF32UI( uiB );
+ sigB = fracF32UI( uiB );
+ signZ = signA ^ signB;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( expA == 0xFF ) {
+ if ( sigA || ((expB == 0xFF) && sigB) ) goto propagateNaN;
+ magBits = expB | sigB;
+ goto infArg;
+ }
+ if ( expB == 0xFF ) {
+ if ( sigB ) goto propagateNaN;
+ magBits = expA | sigA;
+ goto infArg;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( ! expA ) {
+ if ( ! sigA ) goto zero;
+ normExpSig = softfloat_normSubnormalF32Sig( sigA );
+ expA = normExpSig.exp;
+ sigA = normExpSig.sig;
+ }
+ if ( ! expB ) {
+ if ( ! sigB ) goto zero;
+ normExpSig = softfloat_normSubnormalF32Sig( sigB );
+ expB = normExpSig.exp;
+ sigB = normExpSig.sig;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ expZ = expA + expB - 0x7F;
+ sigA = (sigA | 0x00800000)<<7;
+ sigB = (sigB | 0x00800000)<<8;
+ sigZ = softfloat_shortShiftRightJam64( (uint_fast64_t) sigA * sigB, 32 );
+ if ( sigZ < 0x40000000 ) {
+ --expZ;
+ sigZ <<= 1;
+ }
+ return softfloat_roundPackToF32( signZ, expZ, sigZ );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ propagateNaN:
+ uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
+ goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ infArg:
+ if ( ! magBits ) {
+ softfloat_raiseFlags( softfloat_flag_invalid );
+ uiZ = defaultNaNF32UI;
+ } else {
+ uiZ = packToF32UI( signZ, 0xFF, 0 );
+ }
+ goto uiZ;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ zero:
+ uiZ = packToF32UI( signZ, 0, 0 );
+ uiZ:
+ uZ.ui = uiZ;
+ return uZ.f;
+
+}
+
projects / riscv-isa-sim.git / blobdiff