Access optimization compiling method and device for functions

A compiling method and memory access technology, which is applied in the computer field, can solve problems such as the unsatisfactory effect of the total number of instructions and the low efficiency of target register loading.

Active Publication Date: 2016-12-07
LOONGSON TECH CORP
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Problems solved by technology

[0005] The present invention provides a function memory access optimization compiling method and device, which are used to solve the unsatisfactory effect of reducing the total number of instructions in the function sequenc

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  • Access optimization compiling method and device for functions
  • Access optimization compiling method and device for functions
  • Access optimization compiling method and device for functions

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Embodiment 7

[0149] S701: The compiler arranges the N registers that need to be saved in the type according to the numbers from small to large, and obtains a sequentially numbered register sequence.

[0150] Specifically, the register sequence is

[0151] S702: The compiler judges whether the offset of each register of this type relative to the stack base address register sp is 16-byte aligned. If yes, execute S703; if not, execute S706.

[0152] S703: The compiler judges whether the N can divide the quotient of the memory access width of the above-mentioned vector memory access instruction divided by the width of the register of this type (the quotient value is 2), that is, judges whether the above-mentioned N is an even number. If yes, execute S704, and if not, execute S705.

[0153] S704: If it is divisible (that is, N is an even number), then the compiler groups the N registers numbered in the above order to obtain the first register group, and the number of registers in the first ...

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Abstract

The invention provides an access optimization compiling method and device for functions. The method comprises the following steps of: grouping the same type of registers related to a function series or a function sequence of a to-be-compiled function by a compiler according to widths of the same type of registers and an access width of a vector access instruction in a target processor, so as to obtain register groups, and determining a type of an intermediate code corresponding to each register group according to the number of registers in each register group; if the type of the intermediate code corresponding to the register group is an intermediate code in a vector form, generating a fist intermediate code in the vector form for the register group; and generating a first assembly code by the compiler according to the first intermediate code, and outputting the first assembly code to the target processor. According to the method provided by the embodiments of the invention, the quantity of instructions in the function series or function sequence is greatly decreased, the space for storing the instructions is saved, the access efficiency of a computer is improved and the pressure of the registers is decreased.

Description

technical field [0001] The invention relates to computer technology, in particular to a function memory access optimization compiling method and device. Background technique [0002] There are a large number of function calls in high-level language programs, and the sequence and postscript of functions are indispensable code fragments for realizing function calls. The function sequence (Prologue) is responsible for establishing the stack space and saving the registers to be saved in the stack space, and the function epilogue (Epilogue) is responsible for restoring the above-mentioned saved registers from the stack space and destroying the stack space. Studies have shown that in several typical programs compiled under the MIPS instruction set, the number of instructions in the function prologue or function postscript accounts for about 4% to 25% of the total number of dynamic instructions, and most of the instructions in the function prologue or function postscript are It is...

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Application Information

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IPC IPC(8): G06F9/45
Inventor 邱吉徐成华宋贵环
Owner LOONGSON TECH CORP
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