AN3350 datasheet(182/185 Pages) STMICROELECTRONICS

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eTPU specific features

AN3350

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Doc ID 018512 Rev 2

This pragma writes information into the host interface files. The created file would have the

name of the compiled file with the extension <char>. The <text> information can be either

direct text or ::ETPU macros, which are expanded at link time and can give the host

application information regarding the code and the data variables location and initialization.

23.14

#pragma fill

#pragma fill = list, ...;

#pragma fill [size] @ location = list, ... ;

The compiler will fill program memory with <list>. <list> items are any values or strings,

defined as constant data separated by commas.

When size is not specified the compiler will simply emit the list in memory. If <size> is

specified, the compiler will fill <size> words of memory with the data. The compiler will

truncate the list to fit size, or repeat it to fill exactly <size> words.

23.15

__attribute__((expects_flags))

Specifies that a function is using the flags created in the caller function by the assignment

into the first argument

Syntax

__attribute__((expects_flags)) function-declaration;

__attribute__((expects_flags)) function-definition;

23.16

__attribute__((no_save_registers))

Specifies that this function do not save and restore its registers. The only thing added in its

epilogue is an rtn instruction. This attribute is not recommended and is here only for

backwards compatibility with old code.

Syntax

__attribute__((no_save_registers)) function-declaration;

__attribute__((no_save_registers)) function-definition;

23.17

__attribute__((pure_assembly))

Specifies that this function contains only inline assembly instructions and it will not be

optimized. It would also not have any prologue or epilogue. This attribute is not

recommended and is here only for backwards compatibility with old code.

The recommended way of doing it is simply writing the code in an assembly file and not as C

inline assembly.

AN3350 Datasheet(PDF) 182 Page - STMicroelectronics