_ReadCoProcessor (Windows CE 5.0)
This instruction causes the specified coprocessor registers to transfer values to two ARM registers.
The XScale and the DSP-enhanced ARM microprocessors each implement this instruction in a different way:
- For the ARM XScale implementation, this instruction does the following:
- Moves 64 bits of data to ARM registers from Coprocessor registers
- Moves the 40-bit accumulator value (acc0) into two registers
- Moves bits [31:0] of the value in acc0 into the register RdLo
- Sign-extends bits [39:32] of the value in acc0 to 32 bits and moves them into the register RdHi
- For the ARM DSP-enhanced implementation, this instruction causes the coprocessor to transfer values to the two general-purpose registers Rd and Rn.
__int64 _ReadCoProcessor(int Arg1);
Parameters
- Arg1
[in] Coprocessor number, equivalent to cp_num.
Return Values
Value held in coprocessor register.
Remarks
The compiler translates this instruction into the MRRC assembly instruction for ARM DSP-enhanced processors, and into the MRA assembly instruction for ARM XScale processors. MRA is disassembled as the MRCC instruction.
Requirements
Header: Armintr.h.
See Also
ARM DSP-enhanced Intrinsic Functions | ARM XSCALE Intrinsic Functions | _WriteCoProcessor
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