Diferencias entre real y extended

[[cHackAll]]

Empezado por http://homepages.borland.com/efg2lab/Mathematics/NaN.htm

The "Real" definition is now a "generic" type, as shown in Table 4. "Real" in Delphi 4/5 is equivalent to "Double." The "Extended" type offers greater precision than other real types but is less portable — the IEEE "Double" has the most precision that is a defined standard for all platforms. Be careful using Extended if you are creating data files to share across platforms. The Double type is adequate for most scientific and engineering calculations, so the new "Real" can be used for most calculations. Since the Double is 64-bits long, performance with the 64-bit processors in the near future will probably be faster with doubles than with the 80-bit extended values.

Empezado por http://forum.ixbt.com/topic.cgi?id=26:37673

GenuineIntel.006F6 - Core 2 Duo E6300

Value= 9.98409973144531E+0002 Single = 96.02 clocks
Value= 9.98334166468120E+0002 Double = 112.01 clocks
Value= 9.98334166468282E+0002 Extended = 117.01 clocks

AuthenticAMD.40FB2 - Athlon X2 3800+

Value= 9.98409973144531E+0002 Single = 101.05 clocks
Value= 9.98334166468120E+0002 Double = 104.09 clocks
Value= 9.98334166468282E+0002 Extended = 122.90 clocks

Empezado por http://forum.ixbt.com/topic.cgi?id=26:37673

GenuineIntel.006F6

sin
Value= 0.00000000000000E+0000 Single = 97.12 clocks
Value= 0.00000000000000E+0000 Double = 95.15 clocks
Value= 0.00000000000000E+0000 Extended = 103.13 clocks

sqrt
Value= 0.00000000000000E+0000 Single = 68.87 clocks
Value= 0.00000000000000E+0000 Double = 68.15 clocks
Value= 0.00000000000000E+0000 Extended = 68.73 clocks

arctan
Value= 0.00000000000000E+0000 Single = 143.13 clocks
Value= 0.00000000000000E+0000 Double = 143.15 clocks
Value= 0.00000000000000E+0000 Extended = 148.13 clocks

AuthenticAMD.40FB2

sin
Value= 0.00000000000000E+0000 Single = 101.09 clocks
Value= 0.00000000000000E+0000 Double = 101.10 clocks
Value= 0.00000000000000E+0000 Extended = 125.51 clocks

sqrt
Value= 0.00000000000000E+0000 Single = 32.08 clocks
Value= 0.00000000000000E+0000 Double = 32.08 clocks
Value= 0.00000000000000E+0000 Extended = 46.07 clocks

arctan
Value= 0.00000000000000E+0000 Single = 157.98 clocks
Value= 0.00000000000000E+0000 Double = 157.30 clocks
Value= 0.00000000000000E+0000 Extended = 175.08 clocks

Saludos