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optimizing fabric bitsteream memory footprint

This commit is contained in:
tangxifan 2020-07-02 12:39:18 -06:00
parent ac22ba28e4
commit b85af57971
3 changed files with 14 additions and 0 deletions
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4
openfpga/src/fpga_bitstream/build_fabric_bitstream.cpp
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@ -495,6 +495,10 @@ FabricBitstream build_fabric_dependent_bitstream(const BitstreamManager& bitstre
VTR_ASSERT(1 == top_block.size()); VTR_ASSERT(1 == top_block.size());
VTR_ASSERT(0 == top_module_name.compare(bitstream_manager.block_name(top_block[0]))); VTR_ASSERT(0 == top_module_name.compare(bitstream_manager.block_name(top_block[0])));
/* Reserve bits before build-up */
fabric_bitstream.reserve(bitstream_manager.bits().size());
/* Start build-up formally */
build_module_fabric_dependent_bitstream(config_protocol, build_module_fabric_dependent_bitstream(config_protocol,
bitstream_manager, top_block[0], bitstream_manager, top_block[0],
module_manager, top_module, module_manager, top_module,

7
openfpga/src/fpga_bitstream/fabric_bitstream.cpp
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@ -55,6 +55,13 @@ bool FabricBitstream::bit_din(const FabricBitId& bit_id) const {
/****************************************************************************** /******************************************************************************
* Public Mutators * Public Mutators
******************************************************************************/ ******************************************************************************/
void FabricBitstream::reserve(const size_t& num_bits) {
bit_ids_.reserve(num_bits);
config_bit_ids_.reserve(num_bits);
bit_addresses_.reserve(num_bits);
bit_dins_.reserve(num_bits);
}
FabricBitId FabricBitstream::add_bit(const ConfigBitId& config_bit_id) { FabricBitId FabricBitstream::add_bit(const ConfigBitId& config_bit_id) {
FabricBitId bit = FabricBitId(bit_ids_.size()); FabricBitId bit = FabricBitId(bit_ids_.size());
/* Add a new bit, and allocate associated data structures */ /* Add a new bit, and allocate associated data structures */

3
openfpga/src/fpga_bitstream/fabric_bitstream.h
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@ -60,6 +60,9 @@ class FabricBitstream {
bool bit_din(const FabricBitId& bit_id) const; bool bit_din(const FabricBitId& bit_id) const;
public: /* Public Mutators */ public: /* Public Mutators */
/* Reserve config bits */
void reserve(const size_t& num_bits);
/* Add a new configuration bit to the bitstream manager */ /* Add a new configuration bit to the bitstream manager */
FabricBitId add_bit(const ConfigBitId& config_bit_id); FabricBitId add_bit(const ConfigBitId& config_bit_id);