FPGA Optimization Flags
The following table summarizes FPGA optimization flags:
Flags
| Description
| Example
|
|---|---|---|
-Xsclock=<clock target in Hz/KHz/MHz/GHz or s/ms/us/ns/ps> | Schedules f MAX target for kernels.
| dpcpp -fintelfpga –Xshardware –Xsclock=<clock target> <source_file>.cpp |
-Xsno-interleaving=<global_memory_type>
| Disables burst-interleaving for all global memory banks of the same type and manages them manually
| dpcpp -fintelfpga -Xshardware <source_file>.cpp -Xsno-interleaving=DDR |
-Xsglobal-ring | Forces ring interconnect for global memory.
| dpcpp -fintelfpga -Xshardware -Xsglobal-ring <source_file>.cpp |
-Xsforce-single-store-ring
| Narrows the interconnect to save area while limiting write-only throughput to one bank's worth.
| dpcpp -fintelfpga -Xshardware -Xsforce-single-store-ring <source_file>.cpp |
-Xsnum-reorder | Narrows the interconnect to save area while reducing read-only throughput.
| dpcpp -fintelfpga -Xshardware -Xsnum-reorder=1 <source_file>.cpp |
-Xsno-hardware-kernel-invocation-queue | Reduces kernel area use by removing kernel invocation queue in DPC++ kernel.
| dpcpp -fintelfpga -Xshardware -Xsno-hardware-kernel-invocation-queue <source_file>.cpp |
-Xshyper-optimized-handshaking=<auto|off> | Modifies the handshaking protocol used in certain areas of the design
| dpcpp -fintelfpga -Xshardware -Xshyper-optimized-handshaking=auto <source_file>.cpp |
dpcpp -fintelfpga -Xshardware -Xshyper-optimized-handshaking=off <source_file>.cpp | ||
-Xsdisable-auto-loop-fusion | Disables the automatic fusion of loops when compiling the design.
| dpcpp -fintelfpga -Xshardware -Xsdisable-auto-loop-fusion <source_file>.cpp |
-Xsenable-unequal-tc-fusion | Fuses adjacent loops with unequal trip counts into a single loop without affecting either loop's functionality.
| dpcpp -fintelfpga -Xshardware -Xsenable-unequal-tc-fusion <source_file>.cpp |
-Xsauto-pipeline | Pipelines loops in non-task ( parallel_for ) kernels.
| dpcpp -fintelfpga –Xshardware -Xsauto-pipeline < source_file >.cpp |
-Xsffp-contract=fast | Removes intermediary floating-point rounding operations and conversions whenever possible and carries additional bits to maintain precision.
| dpcpp -fintelfpga -Xshardware -Xsffp-contract=fast <source_file>.cpp |