Q37768: READ/DATA Statement Slower in QB 4.00 & BC 6.00 Than QB 3.00
Article: Q37768 Product(s): See article Version(s): 6.00 6.00b 7.00 | 6.00 6.00b 7.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | SR# G881102-5637 B_QuickBas | mspl13_basic Last Modified: 1-FEB-1990 The following are two reasons why READ/DATA statements are slower in Microsoft BASIC Compiler Versions 6.00 and 6.00b, Microsoft BASIC Professional Development System (PDS) Version 7.00, and QuickBASIC Versions 4.00, 4.00b, and 4.50 than in the noncoprocessor version of QuickBASIC Version 3.00: 1. Math Package The noncoprocessor version of QuickBASIC Version 3.00 (QB.EXE) uses Microsoft Binary Format (MBF) for floating-point numbers, while QuickBASIC Versions 4.x, Microsoft BASIC PDS, and the BASIC compiler Versions 6.00 and 6.00b use IEEE. If a math coprocessor is not present, the later compilers emulate one and, thus, are slower than the noncoprocessor version of QuickBASIC 3.00. To increase its speed without a coprocessor, the BASIC compiler Versions 6.00 and 6.00b and Microsoft BASIC PDS Version 7.00 provide support for the alternate math library. Alternate math is a subset of IEEE and is 40 to 50 percent faster than emulating a math coprocessor (but is still slower than MBF). To use alternate math, compile with the BC /FPa switch. Note that the alternate math library is not supported in Microsoft QuickBASIC Compiler Versions 1.00, 1.01, 1.02, 2.00, 2.01, 3.00, 4.00, 4.00b, or 4.50. 2. Microsoft rewrote the code for READ and DATA statements to support both the QB.EXE 4.00, 4.00b, and 4.50 environment and separate compilation in the BC.EXE BASIC compiler. QuickBASIC 3.00 is highly dependent upon a particular format and location for DATA statements. In QuickBASIC 4.00 and later, and in the QuickBASIC extended environment included with Microsoft BASIC PDS Version 7.00, the support is generalized to allow for DATA statements in Quick libraries.
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