diff options
| author | Andrew Waterman <waterman@s144.Millennium.Berkeley.EDU> | 2010-10-15 16:17:53 -0700 |
|---|---|---|
| committer | Andrew Waterman <waterman@s144.Millennium.Berkeley.EDU> | 2010-10-15 16:17:53 -0700 |
| commit | ab928baadbfd3316988a3ad5b5d9b84693a8636f (patch) | |
| tree | b464ce729d53aeff072ed2c341b06194e9ea174b /softfloat/s_mulAddF32.c | |
| parent | d3cb781e165427412b299b6034289b8458472790 (diff) | |
| download | riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.zip riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.tar.gz riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.tar.bz2 | |
[sim] made softfloat files C instead of C++
Diffstat (limited to 'softfloat/s_mulAddF32.c')
| -rwxr-xr-x | softfloat/s_mulAddF32.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/softfloat/s_mulAddF32.c b/softfloat/s_mulAddF32.c new file mode 100755 index 0000000..e55a0ba --- /dev/null +++ b/softfloat/s_mulAddF32.c @@ -0,0 +1,171 @@ +
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t
+ softfloat_mulAddF32(
+ int op, uint_fast32_t uiA, uint_fast32_t uiB, uint_fast32_t uiC )
+{
+ 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 sigZ64, sigC64;
+ int shiftCount;
+ 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_shortShift64RightJam( 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_shift64RightJam( sigProd, 32 - expDiff );
+ } else {
+ expZ = expProd;
+ sigZ64 =
+ sigProd
+ + softfloat_shift64RightJam(
+ (uint_fast64_t) sigC<<32, expDiff );
+ sigZ = softfloat_shortShift64RightJam( sigZ64, 32 );
+ }
+ if ( sigZ < 0x40000000 ) {
+ --expZ;
+ sigZ <<= 1;
+ }
+ } else {
+/*** OPTIMIZE BETTER? ***/
+ sigC64 = (uint_fast64_t) sigC<<32;
+ if ( expDiff < 0 ) {
+ signZ = signC;
+ expZ = expC;
+ sigZ64 = sigC64 - softfloat_shift64RightJam( sigProd, - expDiff );
+ } else if ( ! expDiff ) {
+ expZ = expProd;
+ sigZ64 = sigProd - sigC64;
+ if ( ! sigZ64 ) goto completeCancellation;
+ if ( sigZ64 & UINT64_C( 0x8000000000000000 ) ) {
+ signZ ^= 1;
+ sigZ64 = - sigZ64;
+ }
+ } else {
+ expZ = expProd;
+ sigZ64 = sigProd - softfloat_shift64RightJam( sigC64, expDiff );
+ }
+ shiftCount = softfloat_countLeadingZeros64( sigZ64 ) - 1;
+ expZ -= shiftCount;
+ shiftCount -= 32;
+ if ( shiftCount < 0 ) {
+ sigZ = softfloat_shortShift64RightJam( sigZ64, - shiftCount );
+ } else {
+ sigZ = (uint_fast32_t) sigZ64<<shiftCount;
+ }
+ }
+ 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;
+ }
+ invalid:
+ 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;
+
+}
+
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