RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
4.7.33 __schedule_barrier
This intrinsic creates a sequence point where operations before and operations after the
sequence point are not merged by the compiler. A scheduling barrier does not cause
memory to be updated. If variables are held in registers they are updated in place, and
not written out.
This intrinsic is similar to the __nop intrinsic, except that no NOP instruction is generated.
Syntax
void schedule_barrier(void)
See also
• __nop on page 4-78
4.7.34 __semihost
This intrinsic inserts an SVC or BKPT instruction into the instruction stream generated by
the compiler. It enables you to make semihosting calls from C or C++ that are
independent of the target architecture.
Syntax
int __semihost(int val, const void *ptr)
Where:
val
ptr
Is the request code for the semihosting request.
See Appendix A Semihosting in the Developer Guide for more
information.
Is a pointer to an argument/result block.
See Appendix A Semihosting in the Developer Guide for more
information.
Return value
See Appendix A Semihosting in the Developer Guide for more information on the
results of semihosting calls.
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