The VFP11 coprocessor can execute in each of the three pipelines independently of the others and without blocking issue or writeback from any pipeline. Separate LS, FMAC, and DS pipelines enable parallel operation of CDP and data transfer instructions. Scheduling instructions to take advantage of the parallelism that occurs when multiple instructions execute in the VFP11 pipelines can result in a significant improvement in program execution time.

A data transfer operation can begin execution if:

A CDP can be issued to the FMAC pipeline if:

A divide or square root instruction can be issued to the DS pipeline if:

Table 4.16 shows a case of the VFP11 coprocessor executing instructions in parallel in each of the three pipelines:

In this example, the LEN field contains b011, selecting a vector length of four iterations, and the STRIDE field contains b00, for a vector stride of one.

FLDM      [R4], {S4-S13}

FDIVS     S0, S1, S2

FADDS     S16, S20, S24

Table 4.16 shows the pipeline progression of the three instructions.

In Example 4.13, no data hazards exist between any of the three instructions. The load multiple can begin execution immediately, and data is transferred to the register file beginning in cycle 6. Because the destination is in bank 0, the FDIVS is a scalar operation and requires one cycle in the FMAC pipeline E1 stage. If the FDIVS was a short vector operation, the FADDS could not begin execution until the last FDIVS iteration passed the FMAC E1 pipeline stage. The FADDS is a short vector operation and requires the FMAC pipeline E1 stage for cycles 5-8.