JPH03105621A - Non-numerical processing system - Google Patents

Abstract

PURPOSE:To change the flow of a program by data by using a non-numerical value being a part of the data as a trigger for branching. CONSTITUTION:In non-numerical data 10 with a branch address of a binary floating point expression format, a code part (s) is undefined, an exponential part (e) is set to the maximum exponential value (all '1'), '0' is set to the head as a mantissa (f), and subsequently, a flag is provided, thereafter, the branch address is set. A branch address extracting means 13 extracts a branch address from an operand register 11. A microprogram address counter 14 executes an access to a microprogram store 15, based on the inputted branch address and fetches a microprogram of a branch destination from the corresponding address. In such a way, when a data processing for using numerical data of the binary floating point expression format as an operand is executed by a microprogram, the flow of the program can be changed by the data.

Description

[Detailed Description of the Invention] [Summary] A numerical value in binary floating point representation format including an exponent part and a mantissa part,
To provide a second method for processing non-numeric data that allows the flow of the program to be changed by the data when executing data processing using a microprogram that uses numeric data in a binary floating point representation format as an operand, regarding a processing device that processes non-numeric data. For the purpose of
A branched non-numeric detection means is provided with non-numeric data consisting of an address, and is driven by the detection output of the branched non-numeric detection means that manually generates a part of the mantissa of the exponent part of the numerical value stored in the operand register. and a branch address extraction means for extracting a branch address from the operand register, and sets the content extracted by the branch address extraction means in a microprogram address counter to cause the microprogram to branch. do. [Field of Industrial Application] The present invention relates to a processing device that processes numerical values and non-numeric values in binary floating point representation including an exponent and a mantissa, and particularly relates to a processing device that branches a microprogram based on non-numeric data. Binary floating point operations are commonly used in information processing technology. Conventionally, expression formats defined by IEEE standards have been widely used to express numerical data handled in binary floating-point operations. -4. When controlling a microprogram, you may want to start another process when processing specific data. For example, when debugging a microprogram, there are times when you want to execute a specific process (such as outputting a status) when a certain processing stage is reached, but such a process cannot be easily performed. [Prior Art] Figure 4 shows a binary floating point format according to the conventional IEEE standard. Its a. As shown in , a binary floating point number expressed as a normal number has a sign part S and an exponent part e.
and a mantissa part f. For data in this floating point representation format, if a number outside the specified range occurs during an operation, it will be treated as an exception and the number will be treated as a non-numeric value. The expression format standardized by IEEE as a non-numeric value is b. This is the content shown in . In other words, the code part S is undefined,
The exponent part e is the maximum exponent value (all l in binary), and the mantissa part '
is the content OxXX...X (f≠000,...O). In this case, when normalized, the exponent e overflows, resulting in a structure that has no meaning as a numerical value. When performing calculations using such binary floating point data, even if you wanted to execute a specific process when a certain process was completed, conventionally it was not possible to change the flow of the microprogram from the outside. could not. That is, in the past, when such a need arose, it was necessary to add microprogram instructions. However, when debugging a microprogram, it is difficult to change the contents of the microprogram if you want to execute a specific process midway through the process. [Lesson 1 that the invention attempts to solve! I] As mentioned above, there was a problem in that it was difficult to start a specific process when a certain process was completed in the middle of processing by a microprogram. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for processing non-numeric data that allows the flow of the program to be changed by the data when data processing using numerical data in binary floating point representation format as an operand is executed by a microprogram.

[Means for solving the problem] Figure 1 is a horizontal diagram of the principle of the present invention. In FIG. 1, 10 shows the structure of non-numeric data with a branch address provided according to the present invention, l1 is an operand register, l2 is a non-numeric flag detection means, 13 is a branch address extraction means, and 14 is a microprogram.・Address counter 15 represents the microprogram store. 2i! In the non-numeric data 10 with a branch address in floating point representation format, the sign part S is undefined,
The exponent part e is the maximum exponent value (all l), and the next mantissa part r
As such, we set a flag consisting of a 0 at the beginning, a predetermined number of bits after that, and then set a branch address. The present invention provides a configuration that represents holding a branch address as floating point non-numeric data, and when non-numeric data with such a configuration is detected, the branch address part in the data is The program extracts the branch address, retrieves the corresponding program from the microprogram store, and processes the branch. [Operation] In calculations and data processing, when an operand in floating point representation format is stored in the operand register 1l,
A detection operation is performed in the non-numeric flag detection means 12,
Detects whether part of the exponent and mantissa parts of a stored number is non-numeric data with a branch address with a specific configuration. If it is a normal binary floating point number, calculations and other processing will be performed as it is, but if it is detected as non-numeric data with a branch address attached by the flag in the mantissa, the branch address will be extracted. Drive means 13. A branch address extraction means 13 extracts a branch address stored in a predetermined position from the operand register 11 and supplies it to the microprogram address counter 14. The microprogram address counter 14 accesses the microprogram store 15 based on the input branch address, retrieves the branch destination microprogram from the corresponding address, and executes processing according to that program. In this way, by preparing non-numeric data with a branch address in memory in binary floating point data, it is possible to have the branch address execute the necessary processing when processing specific data. can. [Example] Figure 2 is a configuration diagram of an example. B in Figure 2. 20 shows a concrete example of non-numeric data in binary floating point representation format according to the present invention. Also,
A in Figure 2. , 2l is the operand register, 2
2 represents a non-numeric value detection circuit, 23 represents a flag identification circuit, 24 represents a branch address extraction circuit, 25 represents a microprogram address counter, 26 represents a microprogram store, and 27 represents a decoder. In the non-numeric data 20, the sign part of the first O-th bit is undetermined 3! it (anything is fine), 8 bits of "l" are set for the exponent part of the next 1st bit to 8th bit, and "rool" is set as a flag to the 9th bit to 11th bit included in the subsequent mantissa part. The following 12th to 3rd bits contain rAA as a branch address.
AA...A" is set. An operand is set in the operand register 21 from a memory (not shown). If the set value is a value in normal binary floating point format, it is used for calculations, but the non-number detection circuit 2
In step 2, non-numeric data with 20 prerequisites is detected from data in binary floating point format. In this case, the exponent part (1st to 8th bits) are all “1”
”, the tip wi (9th bit) of the exponent part is “0” or
If the condition is satisfied, an exception is generated as it is a non-numeric value, and the next flag identification circuit 23 is activated. The flag identification circuit 23 determines that the 3-bit note (9th bit to 11th bit) including the beginning of the mantissa is r00.
1J, and if it is identified as "roo1", the branch address extraction circuit 24 is activated. “001
”, the corresponding processing is performed as if it were a normal non-numeric value. When activated, the branch address extraction circuit 24 extracts the branch address stored in the 12th to 31st bits of the operand register 2l and outputs it to the microprogram address counter 25. When the input branch address is set, the microprogram address counter 25 reads out the microprogram store 26 using that address. The microprogram output from the microprogram store 26 is decoded by a decoder in the same manner as before, and the corresponding control is executed. Microprogram address counter 25
is counted up at a predetermined period and branch processing is executed. Figure 3 shows an example of processing according to the present invention. Data 31, 32, etc. to be processed are stored in the memory 30, processing (operation, etc.) using the data 31 as test I is performed, and when non-numeric data 32 with a branch address according to the present invention is reached, With the configuration of the embodiment shown in FIG. 2, a branch address is extracted and the microprogram branches to the branch address. Then, the microprogram executes processing such as outputting the data of the calculation results obtained so far or taking a dump of the status. Execute the branching process [Effects of the Invention] According to the present invention, a non-numeric value that is part of data can be used as a trigger for branching. This allows you to define data that involves the activation of a certain process, making it possible to debug microprograms more efficiently by taking a status dump when specific data is processed, understanding the data processing process, etc. can. Also, this processing is performed only when a non-numeric value with a branch address is detected, so it does not affect normal processing.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle structure of the present invention, Fig. 2 is a block diagram of an embodiment, Fig. 3 is a processing example of the present invention, and Fig. 4 is a diagram showing the conventional binary floating point representation format. ．． In Fig. 1, 10: Structure of non-numeric data with branch address 11: Oberand register 12: Non-numeric flag detection means 13: Branch address extraction means 14: Microprogram address counter 15: Microprogram store not → 茫Kiri no Qi 1 Ri Wai Ii 8 Diagram 1 Kuchio 2 En

Claims (1)

[Claims] A numerical value in binary floating point representation format including an exponent part and a mantissa part,
In a processing device that processes non-numeric values, non-numeric data is provided, the exponent part of the binary floating point representation format being the maximum exponent value, and the mantissa part consisting of a branch flag and a branch address with 0 at the beginning, and the operand A branched non-numeric value detecting means (12) receives as input a part of the mantissa of the exponent part of the numerical value stored in the register (11), and when driven by the detection output of the branched non-numeric value, a branch is detected from the operand register.・A branch address extracting means (13) for extracting an address is provided, and the content extracted by the branch address extracting means (13) is set in a microprogram address counter (14), thereby causing a branch of the microprogram. A non-numerical processing method characterized by