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coder.ignoreSize

Prevent code generator from creating function specializations for constant-size expressions

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Syntax

coder.ignoreSize(expression)

Description

example

coder.ignoreSize(expression)declares that the code generator must not use the constant size of an expression to create function specializations.

Examples

Duplicate Functions Generated for Multiple Input Sizes

If your MATLAB®code calls a function multiple times and passes inputs of different sizes, the code generator can create function specializations for each size. To avoid this issue, usecoder.ignoreSizeon the function input. For example, this code usescoder.ignoreSizeto avoid creating multiple copies of the functionindexOf:

function[out1, out2] = test1(in) a = 1:10; b = 2:40;% Without coder.ignoreSize duplicate functions are generatedout1 = indexOf(coder.ignoreSize(a), in); out2 = indexOf(coder.ignoreSize(b), in);endfunctionindex = indexOf(array, value) coder.inline('never');fori = 1:numel(array)ifarray(i) == value index = i;returnendendindex = -1;returnend

生成code, enter:

codegentest1-config:lib-report-args{1}

Input Arguments

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Example:foo(coder.ignoreSize(1:10))

More About

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Function Specialization

Version of a function in which an input type, size, complexity, or value is customized for a particular invocation of the function.

Function specialization produces efficient C code at the expense of code duplication. The code generation report shows all MATLAB function specializations that the code generator creates. However, the specializations might not appear in the generated C/C++ code due to later transformations or optimizations.

Tips

  • If you assign an expression to a variable and declare the variable as variable-size by usingcoder.varsize, this declaration has the same effect as usingcoder.ignoreSizeon the expression.

See Also

Topics

Introduced in R2019b

MATLAB Coder Documentation

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