Changeset a82695c in mainline for softfloat/generic/conversion.c

Timestamp:

2006-02-22T11:29:49Z (19 years ago)

Author:

Josef Cejka <malyzelenyhnus@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

1d83419

Parents:

2cb202e

Message:

Completed conversions from float/double to integer types.

File:

• softfloat/generic/conversion.c (modified) (1 diff)

softfloat/generic/conversion.c

@@ -208 +208 @@
 
 
-
+/** Helping procedure for converting float64 to uint64
+ * @param a floating point number in normalized form (no NaNs or Inf are checked )
+ * @return unsigned integer
+ */
+static __u64 _float64_to_uint64_helper(float64 a)
+{
+        __u64 frac;
+        
+        if (a.parts.exp < FLOAT64_BIAS) {
+                /*TODO: rounding*/
+                return 0;
+        }
+        
+        frac = a.parts.fraction;
+        
+        frac |= FLOAT64_HIDDEN_BIT_MASK;
+        /* shift fraction to left so hidden bit will be the most significant bit */
+        frac <<= 64 - FLOAT64_FRACTION_SIZE - 1; 
+
+        frac >>= 64 - (a.parts.exp - FLOAT64_BIAS) - 1;
+        if ((a.parts.sign == 1) && (frac != 0)) {
+                frac = ~frac;
+                ++frac;
+        }
+        
+        return frac;
+}
+
+/* Convert float to unsigned int64
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__u64 float64_to_uint64(float64 a)
+{
+        if (isFloat64NaN(a)) {
+                return MAX_UINT64;
+        }
+        
+        if (isFloat64Infinity(a) || (a.parts.exp >= (64 + FLOAT64_BIAS)))  {
+                if (a.parts.sign) {
+                        return MIN_UINT64;
+                }
+                return MAX_UINT64;
+        }
+        
+        return _float64_to_uint64_helper(a);    
+}
+
+/* Convert float to signed int64
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__s64 float64_to_int64(float64 a)
+{
+        if (isFloat64NaN(a)) {
+                return MAX_INT64;
+        }
+        
+        if (isFloat64Infinity(a) || (a.parts.exp >= (64 + FLOAT64_BIAS)))  {
+                if (a.parts.sign) {
+                        return MIN_INT64;
+                }
+                return MAX_INT64;
+        }
+        return _float64_to_uint64_helper(a);
+}       
+
+
+
+
+
+/** Helping procedure for converting float32 to uint64
+ * @param a floating point number in normalized form (no NaNs or Inf are checked )
+ * @return unsigned integer
+ */
+static __u64 _float32_to_uint64_helper(float32 a)
+{
+        __u64 frac;
+        
+        if (a.parts.exp < FLOAT32_BIAS) {
+                /*TODO: rounding*/
+                return 0;
+        }
+        
+        frac = a.parts.fraction;
+        
+        frac |= FLOAT32_HIDDEN_BIT_MASK;
+        /* shift fraction to left so hidden bit will be the most significant bit */
+        frac <<= 64 - FLOAT32_FRACTION_SIZE - 1; 
+
+        frac >>= 64 - (a.parts.exp - FLOAT32_BIAS) - 1;
+        if ((a.parts.sign == 1) && (frac != 0)) {
+                frac = ~frac;
+                ++frac;
+        }
+        
+        return frac;
+}
+
+/* Convert float to unsigned int64
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__u64 float32_to_uint64(float32 a)
+{
+        if (isFloat32NaN(a)) {
+                return MAX_UINT64;
+        }
+        
+        if (isFloat32Infinity(a) || (a.parts.exp >= (64 + FLOAT32_BIAS)))  {
+                if (a.parts.sign) {
+                        return MIN_UINT64;
+                }
+                return MAX_UINT64;
+        }
+        
+        return _float32_to_uint64_helper(a);    
+}
+
+/* Convert float to signed int64
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__s64 float32_to_int64(float32 a)
+{
+        if (isFloat32NaN(a)) {
+                return MAX_INT64;
+        }
+        
+        if (isFloat32Infinity(a) || (a.parts.exp >= (64 + FLOAT32_BIAS)))  {
+                if (a.parts.sign) {
+                        return (MIN_INT64);
+                }
+                return MAX_INT64;
+        }
+        return _float32_to_uint64_helper(a);
+}       
+
+
+/* Convert float64 to unsigned int32
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__u32 float64_to_uint32(float64 a)
+{
+        if (isFloat64NaN(a)) {
+                return MAX_UINT32;
+        }
+        
+        if (isFloat64Infinity(a) || (a.parts.exp >= (32 + FLOAT64_BIAS)))  {
+                if (a.parts.sign) {
+                        return MIN_UINT32;
+                }
+                return MAX_UINT32;
+        }
+        
+        return (__u32)_float64_to_uint64_helper(a);     
+}
+
+/* Convert float64 to signed int32
+ * FIXME: Im not sure what to return if overflow/underflow happens 
+ *      - now its the biggest or the smallest int
+ */ 
+__s32 float64_to_int32(float64 a)
+{
+        if (isFloat64NaN(a)) {
+                return MAX_INT32;
+        }
+        
+        if (isFloat64Infinity(a) || (a.parts.exp >= (32 + FLOAT64_BIAS)))  {
+                if (a.parts.sign) {
+                        return MIN_INT32;
+                }
+                return MAX_INT32;
+        }
+        return (__s32)_float64_to_uint64_helper(a);
+}       
+
+