This intrinsic inserts a CDP or CDP2 instruction
into the instruction stream generated by the compiler. It enables
you to include coprocessor data operations in your C or C++ code.
Note
This intrinsic is intended for specialist expert use only.
Syntax__cdp(unsigned intcoproc, unsigned intops, unsigned intregs)
Where:
coprocIdentifies the coprocessor the instruction is for.
coprocopsIs an encoding of two opcodes where:
the first opcode is a 4-bit coprocessor-specific opcode
the second opcode is an optional 3-bit coprocessor-specific opcode.
Add
0x100toopsCDP2instruction.regsIs an encoding of the coprocessor registers.
The use of these instructions depends on the coprocessor. See your coprocessor documentation for more information.
void copro_example()
{
const unsigned int ops = 0xA3; // opcode1 = A, opcode2 = 3
const unsigned int regs = 0xCDE; // reg1 = C, reg2 = D, reg3 = E
__cdp(4,ops,regs); // coprocessor number 4
}
CDP and CDP2 in the Assembler Reference.
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