efDataDiscreteRateMining varianceDataMemoryDefinition.c 吉超博 commit at 2020-12-24

efDataDiscreteRateMining/dataSharedMemory/varianceDataMemoryDefinition.c

@@ -1796,3 +1796,73 @@ Arithmetic.
 float32 float64_to_float32( struct roundingData *roundData, float64 a )
 {
     flag aSign;
+    int16 aExp;
+    bits64 aSig;
+    bits32 zSig;
+
+    aSig = extractFloat64Frac( a );
+    aExp = extractFloat64Exp( a );
+    aSign = extractFloat64Sign( a );
+    if ( aExp == 0x7FF ) {
+        if ( aSig ) return commonNaNToFloat32( float64ToCommonNaN( a ) );
+        return packFloat32( aSign, 0xFF, 0 );
+    }
+    shift64RightJamming( aSig, 22, &aSig );
+    zSig = aSig;
+    if ( aExp || zSig ) {
+        zSig |= 0x40000000;
+        aExp -= 0x381;
+    }
+    return roundAndPackFloat32( roundData, aSign, aExp, zSig );
+
+}
+
+#ifdef FLOATX80
+
+/*
+-------------------------------------------------------------------------------
+Returns the result of converting the double-precision floating-point value
+`a' to the extended double-precision floating-point format.  The conversion
+is performed according to the IEC/IEEE Standard for Binary Floating-point
+Arithmetic.
+-------------------------------------------------------------------------------
+*/
+floatx80 float64_to_floatx80( float64 a )
+{
+    flag aSign;
+    int16 aExp;
+    bits64 aSig;
+
+    aSig = extractFloat64Frac( a );
+    aExp = extractFloat64Exp( a );
+    aSign = extractFloat64Sign( a );
+    if ( aExp == 0x7FF ) {
+        if ( aSig ) return commonNaNToFloatx80( float64ToCommonNaN( a ) );
+        return packFloatx80( aSign, 0x7FFF, LIT64( 0x8000000000000000 ) );
+    }
+    if ( aExp == 0 ) {
+        if ( aSig == 0 ) return packFloatx80( aSign, 0, 0 );
+        normalizeFloat64Subnormal( aSig, &aExp, &aSig );
+    }
+    return
+        packFloatx80(
+            aSign, aExp + 0x3C00, ( aSig | LIT64( 0x0010000000000000 ) )<<11 );
+
+}
+
+#endif
+
+/*
+-------------------------------------------------------------------------------
+Rounds the double-precision floating-point value `a' to an integer, and
+returns the result as a double-precision floating-point value.  The
+operation is performed according to the IEC/IEEE Standard for Binary
+Floating-point Arithmetic.
+-------------------------------------------------------------------------------
+*/
+float64 float64_round_to_int( struct roundingData *roundData, float64 a )
+{
+    flag aSign;
+    int16 aExp;
+    bits64 lastBitMask, roundBitsMask;
+    int8 roundingMode;