Update SoftFloat

[riscv-isa-sim.git] / softfloat / f16_mul.c

diff --git a/softfloat/f16_mul.c b/softfloat/f16_mul.c
new file mode 100644 (file)
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+++ b/softfloat/f16_mul.c
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+
+/*============================================================================
+
+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"
+
+float16_t f16_mul( float16_t a, float16_t b )
+{
+    union ui16_f16 uA;
+    uint_fast16_t uiA;
+    bool signA;
+    int_fast8_t expA;
+    uint_fast16_t sigA;
+    union ui16_f16 uB;
+    uint_fast16_t uiB;
+    bool signB;
+    int_fast8_t expB;
+    uint_fast16_t sigB;
+    bool signZ;
+    uint_fast16_t magBits;
+    struct exp8_sig16 normExpSig;
+    int_fast8_t expZ;
+    uint_fast32_t sig32Z;
+    uint_fast16_t sigZ, uiZ;
+    union ui16_f16 uZ;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF16UI( uiA );
+    expA  = expF16UI( uiA );
+    sigA  = fracF16UI( uiA );
+    uB.f = b;
+    uiB = uB.ui;
+    signB = signF16UI( uiB );
+    expB  = expF16UI( uiB );
+    sigB  = fracF16UI( uiB );
+    signZ = signA ^ signB;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( expA == 0x1F ) {
+        if ( sigA || ((expB == 0x1F) && sigB) ) goto propagateNaN;
+        magBits = expB | sigB;
+        goto infArg;
+    }
+    if ( expB == 0x1F ) {
+        if ( sigB ) goto propagateNaN;
+        magBits = expA | sigA;
+        goto infArg;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! expA ) {
+        if ( ! sigA ) goto zero;
+        normExpSig = softfloat_normSubnormalF16Sig( sigA );
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+    }
+    if ( ! expB ) {
+        if ( ! sigB ) goto zero;
+        normExpSig = softfloat_normSubnormalF16Sig( sigB );
+        expB = normExpSig.exp;
+        sigB = normExpSig.sig;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expZ = expA + expB - 0xF;
+    sigA = (sigA | 0x0400)<<4;
+    sigB = (sigB | 0x0400)<<5;
+    sig32Z = (uint_fast32_t) sigA * sigB;
+    sigZ = sig32Z>>16;
+    if ( sig32Z & 0xFFFF ) sigZ |= 1;
+    if ( sigZ < 0x4000 ) {
+        --expZ;
+        sigZ <<= 1;
+    }
+    return softfloat_roundPackToF16( signZ, expZ, sigZ );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ propagateNaN:
+    uiZ = softfloat_propagateNaNF16UI( uiA, uiB );
+    goto uiZ;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ infArg:
+    if ( ! magBits ) {
+        softfloat_raiseFlags( softfloat_flag_invalid );
+        uiZ = defaultNaNF16UI;
+    } else {
+        uiZ = packToF16UI( signZ, 0x1F, 0 );
+    }
+    goto uiZ;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ zero:
+    uiZ = packToF16UI( signZ, 0, 0 );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+