WebSVN – HelenOS-historic – Diff – //uspace/trunk/softfloat/generic/mul.c

+ *
  */
 float32 mulFloat32(float32 a, float32 b)
+{
     float32 result;
-    __u64 mant1, mant2;
+    __u64 frac1, frac2;
     __s32 exp;
     result.parts.sign = a.parts.sign ^ b.parts.sign;
     if (isFloat32NaN(a) || isFloat32NaN(b) ) {
         /* TODO: fix SigNaNs */
         if (isFloat32SigNaN(a)) {
-            result.parts.mantisa = a.parts.mantisa;
+            result.parts.fraction = a.parts.fraction;
             result.parts.exp = a.parts.exp;
             return result;
         };
         if (isFloat32SigNaN(b)) { /* TODO: fix SigNaN */
-            result.parts.mantisa = b.parts.mantisa;
+            result.parts.fraction = b.parts.fraction;
             result.parts.exp = b.parts.exp;
             return result;
         };
         /* set NaN as result */
         result.binary = FLOAT32_NAN;
         if (isFloat32Zero(b)) {
             /* FIXME: zero * infinity */
             result.binary = FLOAT32_NAN;
             return result;
+        }
-        result.parts.mantisa = a.parts.mantisa;
+        result.parts.fraction = a.parts.fraction;
         result.parts.exp = a.parts.exp;
         return result;
+    }
     if (isFloat32Infinity(b)) {
         if (isFloat32Zero(a)) {
             /* FIXME: zero * infinity */
             result.binary = FLOAT32_NAN;
             return result;
+        }
-        result.parts.mantisa = b.parts.mantisa;
+        result.parts.fraction = b.parts.fraction;
         result.parts.exp = b.parts.exp;
         return result;
+    }
     /* exp is signed so we can easy detect underflow */
     };
     if (exp < 0) {
         /* FIXME: underflow */
         /* return signed zero */
-        result.parts.mantisa = 0x0;
+        result.parts.fraction = 0x0;
         result.parts.exp = 0x0;
         return result;
     };
-    mant1 = a.parts.mantisa;
+    frac1 = a.parts.fraction;
     if (a.parts.exp > 0) {
-        mant1 |= FLOAT32_HIDDEN_BIT_MASK;
+        frac1 |= FLOAT32_HIDDEN_BIT_MASK;
     } else {
         ++exp;
     };
-    mant2 = b.parts.mantisa;
+    frac2 = b.parts.fraction;
     if (b.parts.exp > 0) {
-        mant2 |= FLOAT32_HIDDEN_BIT_MASK;
+        frac2 |= FLOAT32_HIDDEN_BIT_MASK;
     } else {
         ++exp;
     };
-    mant1 <<= 1; /* one bit space for rounding */
+    frac1 <<= 1; /* one bit space for rounding */
-    mant1 = mant1 * mant2;
+    frac1 = frac1 * frac2;
 /* round and return */
-    while ((exp < FLOAT32_MAX_EXPONENT) && (mant1 >= ( 1 << (FLOAT32_MANTISA_SIZE + 2)))) {
+    while ((exp < FLOAT32_MAX_EXPONENT) && (frac1 >= ( 1 << (FLOAT32_FRACTION_SIZE + 2)))) {
-        /* 23 bits of mantisa + one more for hidden bit (all shifted 1 bit left)*/
+        /* 23 bits of fraction + one more for hidden bit (all shifted 1 bit left)*/
         ++exp;
-        mant1 >>= 1;
+        frac1 >>= 1;
     };
     /* rounding */
-    //++mant1; /* FIXME: not works - without it is ok */
+    /* ++frac1; FIXME: not works - without it is ok */
-    mant1 >>= 1; /* shift off rounding space */
+    frac1 >>= 1; /* shift off rounding space */
-    if ((exp < FLOAT32_MAX_EXPONENT) && (mant1 >= (1 << (FLOAT32_MANTISA_SIZE + 1)))) {
+    if ((exp < FLOAT32_MAX_EXPONENT) && (frac1 >= (1 << (FLOAT32_FRACTION_SIZE + 1)))) {
         ++exp;
-        mant1 >>= 1;
+        frac1 >>= 1;
     };
     if (exp >= FLOAT32_MAX_EXPONENT ) {
         /* TODO: fix overflow */
         /* return infinity*/
         result.parts.exp = FLOAT32_MAX_EXPONENT;
-        result.parts.mantisa = 0x0;
+        result.parts.fraction = 0x0;
         return result;
+    }
-    exp -= FLOAT32_MANTISA_SIZE;
+    exp -= FLOAT32_FRACTION_SIZE;
-    if (exp <= FLOAT32_MANTISA_SIZE) {
+    if (exp <= FLOAT32_FRACTION_SIZE) {
         /* denormalized number */
-        mant1 >>= 1; /* denormalize */
+        frac1 >>= 1; /* denormalize */
-        while ((mant1 > 0) && (exp < 0)) {
+        while ((frac1 > 0) && (exp < 0)) {
-            mant1 >>= 1;
+            frac1 >>= 1;
             ++exp;
         };
-        if (mant1 == 0) {
+        if (frac1 == 0) {
             /* FIXME : underflow */
         result.parts.exp = 0;
-        result.parts.mantisa = 0;
+        result.parts.fraction = 0;
         return result;
         };
     };
     result.parts.exp = exp;
-    result.parts.mantisa = mant1 & ( (1 << FLOAT32_MANTISA_SIZE) - 1);
+    result.parts.fraction = frac1 & ( (1 << FLOAT32_FRACTION_SIZE) - 1);
     return result;
+}
+ *
  */
 float64 mulFloat64(float64 a, float64 b)
+{
     float64 result;
-    __u64 mant1, mant2;
+    __u64 frac1, frac2;
     __s32 exp;
     result.parts.sign = a.parts.sign ^ b.parts.sign;
     if (isFloat64NaN(a) || isFloat64NaN(b) ) {
         /* TODO: fix SigNaNs */
         if (isFloat64SigNaN(a)) {
-            result.parts.mantisa = a.parts.mantisa;
+            result.parts.fraction = a.parts.fraction;
             result.parts.exp = a.parts.exp;
             return result;
         };
         if (isFloat64SigNaN(b)) { /* TODO: fix SigNaN */
-            result.parts.mantisa = b.parts.mantisa;
+            result.parts.fraction = b.parts.fraction;
             result.parts.exp = b.parts.exp;
             return result;
         };
         /* set NaN as result */
         result.binary = FLOAT64_NAN;
         if (isFloat64Zero(b)) {
             /* FIXME: zero * infinity */
             result.binary = FLOAT64_NAN;
             return result;
+        }
-        result.parts.mantisa = a.parts.mantisa;
+        result.parts.fraction = a.parts.fraction;
         result.parts.exp = a.parts.exp;
         return result;
+    }
     if (isFloat64Infinity(b)) {
         if (isFloat64Zero(a)) {
             /* FIXME: zero * infinity */
             result.binary = FLOAT64_NAN;
             return result;
+        }
-        result.parts.mantisa = b.parts.mantisa;
+        result.parts.fraction = b.parts.fraction;
         result.parts.exp = b.parts.exp;
         return result;
+    }
     /* exp is signed so we can easy detect underflow */
     };
     if (exp < 0) {
         /* FIXME: underflow */
         /* return signed zero */
-        result.parts.mantisa = 0x0;
+        result.parts.fraction = 0x0;
         result.parts.exp = 0x0;
         return result;
     };
-    mant1 = a.parts.mantisa;
+    frac1 = a.parts.fraction;
     if (a.parts.exp > 0) {
-        mant1 |= FLOAT64_HIDDEN_BIT_MASK;
+        frac1 |= FLOAT64_HIDDEN_BIT_MASK;
     } else {
         ++exp;
     };
-    mant2 = b.parts.mantisa;
+    frac2 = b.parts.fraction;
     if (b.parts.exp > 0) {
-        mant2 |= FLOAT64_HIDDEN_BIT_MASK;
+        frac2 |= FLOAT64_HIDDEN_BIT_MASK;
     } else {
         ++exp;
     };
-    mant1 <<= 1; /* one bit space for rounding */
+    frac1 <<= 1; /* one bit space for rounding */
-    mul64integers(mant1, mant2, &mant1, &mant2);
+    mul64integers(frac1, frac2, &frac1, &frac2);
 /* round and return */
-    /* FIXME: ugly soulution is to shift whole mant2 >> as in 32bit version
+    /* FIXME: ugly soulution is to shift whole frac2 >> as in 32bit version
      * Here is is more slower because we have to shift two numbers with carry
      * Better is find first nonzero bit and make only one shift
      * Third version is to shift both numbers a bit to right and result will be then
      * placed in higher part of result. Then lower part will be good only for rounding.
      */
-    while ((exp < FLOAT64_MAX_EXPONENT) && (mant2 > 0 )) {
+    while ((exp < FLOAT64_MAX_EXPONENT) && (frac2 > 0 )) {
-        mant1 >>= 1;
+        frac1 >>= 1;
-        mant1 &= ((mant2 & 0x1) << 63);
+        frac1 &= ((frac2 & 0x1) << 63);
-        mant2 >>= 1;
+        frac2 >>= 1;
         ++exp;
+    }
-    while ((exp < FLOAT64_MAX_EXPONENT) && (mant1 >= ( (__u64)1 << (FLOAT64_MANTISA_SIZE + 2)))) {
+    while ((exp < FLOAT64_MAX_EXPONENT) && (frac1 >= ( (__u64)1 << (FLOAT64_FRACTION_SIZE + 2)))) {
         ++exp;
-        mant1 >>= 1;
+        frac1 >>= 1;
     };
     /* rounding */
-    //++mant1; /* FIXME: not works - without it is ok */
+    /* ++frac1;  FIXME: not works - without it is ok */
-    mant1 >>= 1; /* shift off rounding space */
+    frac1 >>= 1; /* shift off rounding space */
-    if ((exp < FLOAT64_MAX_EXPONENT) && (mant1 >= ((__u64)1 << (FLOAT64_MANTISA_SIZE + 1)))) {
+    if ((exp < FLOAT64_MAX_EXPONENT) && (frac1 >= ((__u64)1 << (FLOAT64_FRACTION_SIZE + 1)))) {
         ++exp;
-        mant1 >>= 1;
+        frac1 >>= 1;
     };
     if (exp >= FLOAT64_MAX_EXPONENT ) {
         /* TODO: fix overflow */
         /* return infinity*/
         result.parts.exp = FLOAT64_MAX_EXPONENT;
-        result.parts.mantisa = 0x0;
+        result.parts.fraction = 0x0;
         return result;
+    }
-    exp -= FLOAT64_MANTISA_SIZE;
+    exp -= FLOAT64_FRACTION_SIZE;
-    if (exp <= FLOAT64_MANTISA_SIZE) {
+    if (exp <= FLOAT64_FRACTION_SIZE) {
         /* denormalized number */
-        mant1 >>= 1; /* denormalize */
+        frac1 >>= 1; /* denormalize */
-        while ((mant1 > 0) && (exp < 0)) {
+        while ((frac1 > 0) && (exp < 0)) {
-            mant1 >>= 1;
+            frac1 >>= 1;
             ++exp;
         };
-        if (mant1 == 0) {
+        if (frac1 == 0) {
             /* FIXME : underflow */
         result.parts.exp = 0;
-        result.parts.mantisa = 0;
+        result.parts.fraction = 0;
         return result;
         };
     };
     result.parts.exp = exp;
-    result.parts.mantisa = mant1 & ( ((__u64)1 << FLOAT64_MANTISA_SIZE) - 1);
+    result.parts.fraction = frac1 & ( ((__u64)1 << FLOAT64_FRACTION_SIZE) - 1);
     return result;
+}
     middle1 = a * blow;
     middle2 = alow * b;
     high = a * b;
     middle1 += middle2;
-    high += ((__u64)(middle1 < middle2) << 32) + middle1>>32;
+    high += ((__u64)(middle1 < middle2) << 32) + (middle1 >> 32);
-    middle1 << 32;
+    middle1 <<= 32;
     low += middle1;
     high += (low < middle1);
     *lo = low;
     *hi = high;
     return;

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(root)//uspace/trunk/softfloat/generic/mul.c – Rev 737 → 804