select/rank for unset as well as set bits #4
6 changed files with 94 additions and 77 deletions
2
.envrc
2
.envrc
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@ -1,5 +1,5 @@
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||||||
if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
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if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
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source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
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source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
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fi
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fi
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watch_file devShell.nix shell.nix flake.nix
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watch_file shell.nix flake.nix
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use flake || use nix
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use flake || use nix
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@ -1,5 +1,5 @@
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{
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{
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description = "A Concurrent Skip List library for key/value pairs.";
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description = "A sparse bitmapped index library in C.";
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inputs = {
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
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nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
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@ -475,18 +475,7 @@ __sm_chunk_map_select(__sm_chunk_t *map, size_t n, ssize_t *pnew_n, bool value)
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return ret;
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return ret;
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}
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}
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void printBits(char *name, uint64_t value) {
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extern void print_bits(char *name, uint64_t value); // GSB
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if (name) {
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printf("%s\t", name);
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}
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for (int i = 63; i >= 0; i--) {
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printf("%ld", (value >> i) & 1);
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if (i % 8 == 0) {
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printf(" "); // Add space for better readability
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}
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}
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printf("\n");
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}
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/**
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/**
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* Counts the set bits in the range [0, 'idx'] inclusive ignoring the first
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* Counts the set bits in the range [0, 'idx'] inclusive ignoring the first
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@ -507,47 +496,51 @@ __sm_chunk_map_rank(__sm_chunk_t *map, size_t *offset, size_t idx, sm_bitvec_t *
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continue;
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continue;
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}
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}
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if (flags == SM_PAYLOAD_ZEROS) {
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if (flags == SM_PAYLOAD_ZEROS) {
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if (idx > SM_BITS_PER_VECTOR) {
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*vec = 0;
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if (idx >= SM_BITS_PER_VECTOR) {
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idx -= SM_BITS_PER_VECTOR;
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if (*offset > SM_BITS_PER_VECTOR) {
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if (*offset > SM_BITS_PER_VECTOR) {
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*offset = *offset - SM_BITS_PER_VECTOR;
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*offset = *offset - SM_BITS_PER_VECTOR;
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} else {
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} else {
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idx -= SM_BITS_PER_VECTOR - *offset;
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if (*offset == 0) {
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if (value == false) {
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if (value == false) {
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ret += SM_BITS_PER_VECTOR;
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ret += SM_BITS_PER_VECTOR - *offset;
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}
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}
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}
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*offset = 0;
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*offset = 0;
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}
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}
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} else {
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} else {
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*vec = 0;
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if (value == false) {
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if (value == false) {
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if (*offset > idx) {
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if (*offset > idx) {
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*offset = *offset - idx;
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*offset = *offset - idx;
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} else {
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} else {
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return ret + idx - *offset;
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ret += idx + 1 - *offset;
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*offset = 0;
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return ret;
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}
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}
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} else {
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} else {
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return ret;
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return ret;
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}
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}
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}
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}
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} else if (flags == SM_PAYLOAD_ONES) {
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} else if (flags == SM_PAYLOAD_ONES) {
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if (idx > SM_BITS_PER_VECTOR) {
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*vec = UINT64_MAX;
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if (idx >= SM_BITS_PER_VECTOR) {
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idx -= SM_BITS_PER_VECTOR;
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if (*offset > SM_BITS_PER_VECTOR) {
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if (*offset > SM_BITS_PER_VECTOR) {
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*offset = *offset - SM_BITS_PER_VECTOR;
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*offset = *offset - SM_BITS_PER_VECTOR;
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} else {
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} else {
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idx -= SM_BITS_PER_VECTOR - *offset;
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if (*offset == 0) {
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if (value == true) {
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if (value == true) {
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ret += SM_BITS_PER_VECTOR;
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ret += SM_BITS_PER_VECTOR - *offset;
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}
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}
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}
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*offset = 0;
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*offset = 0;
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}
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}
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} else {
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} else {
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*vec = UINT64_MAX;
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if (value == true) {
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if (value == true) {
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return ret + idx;
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if (*offset > idx) {
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*offset = *offset - idx;
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} else {
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ret += idx + 1 - *offset;
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*offset = 0;
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return ret;
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}
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} else {
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} else {
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return ret;
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return ret;
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}
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}
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@ -555,8 +548,8 @@ __sm_chunk_map_rank(__sm_chunk_t *map, size_t *offset, size_t idx, sm_bitvec_t *
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} else if (flags == SM_PAYLOAD_MIXED) {
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} else if (flags == SM_PAYLOAD_MIXED) {
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sm_bitvec_t w = map->m_data[1 + __sm_chunk_map_get_position(map, i * SM_FLAGS_PER_INDEX_BYTE + j)];
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sm_bitvec_t w = map->m_data[1 + __sm_chunk_map_get_position(map, i * SM_FLAGS_PER_INDEX_BYTE + j)];
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if (idx >= SM_BITS_PER_VECTOR) {
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if (idx >= SM_BITS_PER_VECTOR) {
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uint64_t mask = *offset > 0 ? ~(UINT64_MAX >> (SM_BITS_PER_VECTOR - *offset)) : UINT64_MAX;
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idx -= SM_BITS_PER_VECTOR;
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idx -= SM_BITS_PER_VECTOR;
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uint64_t mask = *offset == 0 ? UINT64_MAX : ~(UINT64_MAX >> (SM_BITS_PER_VECTOR - (*offset >= 64 ? 64 : *offset)));
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size_t pc = popcountll(w & mask);
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size_t pc = popcountll(w & mask);
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if (value == true) {
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if (value == true) {
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ret += pc;
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ret += pc;
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@ -581,20 +574,20 @@ __sm_chunk_map_rank(__sm_chunk_t *map, size_t *offset, size_t idx, sm_bitvec_t *
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that the offset bits are also set. Then popcount(). Then we subtract the count of set
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that the offset bits are also set. Then popcount(). Then we subtract the count of set
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bits found after masking from the possible number of bits that we examined. This should
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bits found after masking from the possible number of bits that we examined. This should
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have inverted the popcount() and counted the unset bits in the range [*offset, idx]. */
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have inverted the popcount() and counted the unset bits in the range [*offset, idx]. */
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mask = idx_mask | offset_mask;
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mask = idx_mask | (offset_mask > idx_mask ? idx_mask : offset_mask);
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mw = w & mask;
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mw = w & mask;
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size_t pc = popcountll(mw);
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size_t pc = popcountll(mw);
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#if 0
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#if 0 // GSB
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printf("---------------------\n");
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printf("---------------------\n");
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printBits("om", offset_mask);
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print_bits("om", offset_mask);
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printBits("im", idx_mask);
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print_bits("im", idx_mask);
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printBits("m", mask);
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print_bits("m", mask);
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printBits("mw", mw);
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print_bits("mw", mw);
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printf("pc: %lu\tidx:%lu\t*o:%lu\n", pc, idx, *offset);
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printf("pc: %lu\tidx:%lu\t*o:%lu\n", pc, idx, *offset);
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#endif
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#endif
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ret += idx + 1 - pc; /* We accounted for offset in our masking above. */
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ret += idx + 1 - pc; /* We accounted for offset in our masking above. */
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}
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}
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*offset = *offset > idx ? *offset - idx : 0;
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*offset = *offset > idx ? *offset - idx + 1 : 0;
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*vec = mw;
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*vec = mw;
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(*vec) <<= *offset;
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(*vec) <<= *offset;
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return ret;
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return ret;
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@ -876,7 +869,7 @@ sparsemap(size_t size)
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sparsemap_t *map = (sparsemap_t *)calloc(1, total_size);
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sparsemap_t *map = (sparsemap_t *)calloc(1, total_size);
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if (map) {
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if (map) {
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uint8_t *data = (uint8_t *)(((uintptr_t)map + sizeof(sparsemap_t)) & ~ (uintptr_t)7);
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uint8_t *data = (uint8_t *)(((uintptr_t)map + sizeof(sparsemap_t)) & ~(uintptr_t)7);
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sparsemap_init(map, data, size);
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sparsemap_init(map, data, size);
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__sm_when_diag({ __sm_assert(IS_8_BYTE_ALIGNED(map->m_data)); });
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__sm_when_diag({ __sm_assert(IS_8_BYTE_ALIGNED(map->m_data)); });
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}
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}
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@ -934,7 +927,7 @@ sparsemap_set_data_size(sparsemap_t *map, size_t size)
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}
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}
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memset(((uint8_t *)m) + sizeof(sparsemap_t) + (m->m_capacity * sizeof(uint8_t)), 0, size - m->m_capacity + padding);
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memset(((uint8_t *)m) + sizeof(sparsemap_t) + (m->m_capacity * sizeof(uint8_t)), 0, size - m->m_capacity + padding);
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m->m_capacity = data_size;
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m->m_capacity = data_size;
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m->m_data = (uint8_t *)(((uintptr_t)m + sizeof(sparsemap_t)) & ~ (uintptr_t)7);
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m->m_data = (uint8_t *)(((uintptr_t)m + sizeof(sparsemap_t)) & ~(uintptr_t)7);
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__sm_when_diag({ __sm_assert(IS_8_BYTE_ALIGNED(m->m_data)); }) return m;
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__sm_when_diag({ __sm_assert(IS_8_BYTE_ALIGNED(m->m_data)); }) return m;
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} else {
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} else {
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map->m_capacity = size;
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map->m_capacity = size;
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@ -1337,47 +1330,44 @@ size_t
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sparsemap_rank_vec(sparsemap_t *map, size_t x, size_t y, bool value, sm_bitvec_t *vec)
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sparsemap_rank_vec(sparsemap_t *map, size_t x, size_t y, bool value, sm_bitvec_t *vec)
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{
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{
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assert(sparsemap_get_size(map) >= SM_SIZEOF_OVERHEAD);
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assert(sparsemap_get_size(map) >= SM_SIZEOF_OVERHEAD);
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size_t gap, amt = 0, result = 0, prev = 0, count = __sm_get_chunk_map_count(map);
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size_t amt = 0, result = 0, prev = 0, count = __sm_get_chunk_map_count(map);
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uint8_t *p = __sm_get_chunk_map_data(map, 0);
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uint8_t *p = __sm_get_chunk_map_data(map, 0);
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if (count == 0) {
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if (value == false) {
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/* The count/rank of unset bits in an empty map is inf, so what you requested is the answer. */
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/* The count/rank of unset bits in an empty map is inf, so what you requested is the answer. */
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if (count == 0 && value == false) {
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return y - x + 1;
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return y - x + 1;
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}
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}
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}
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for (size_t i = 0; i < count; i++) {
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for (size_t i = 0; i < count; i++) {
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sm_idx_t start = *(sm_idx_t *)p;
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sm_idx_t start = *(sm_idx_t *)p;
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gap = start - (prev == 0 ? start : prev);
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/* Start of this chunk is greater than the end of the desired range. */
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/* Start of this chunk is greater than the end of the desired range. */
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if (start > y) {
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if (start > y) {
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if (value == true) {
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if (value == true) {
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return result;
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return result;
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} else {
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} else {
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/* This chunk starts after our range [x, y]. */
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/* This chunk starts after our range [x, y]. */
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return result + gap + (y - x) + 1;
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return result + (y - x) + 1;
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}
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}
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} else {
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} else {
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/* The range and this chunk overlap. */
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/* The range and this chunk overlap. */
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if (value == false) {
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if (value == false) {
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result += start - x;
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result += start - x;
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if (x > start) {
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x -= start;
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} else {
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x = 0;
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}
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}
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}
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}
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x -= gap;
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if (value == false) {
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result += gap;
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}
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}
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prev = start;
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prev = start;
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p += sizeof(sm_idx_t);
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p += sizeof(sm_idx_t);
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__sm_chunk_t chunk;
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__sm_chunk_t chunk;
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__sm_chunk_map_init(&chunk, p);
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__sm_chunk_map_init(&chunk, p);
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/* Ensure that x, the offset, isn't beyond the start of this chunk. */
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//if (x > y - start) {
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// amt = value ? 0 : y - start + 1;
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//} else {
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/* Count all the set/unset inside this chunk. */
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/* Count all the set/unset inside this chunk. */
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amt = __sm_chunk_map_rank(&chunk, &x, y - start, vec, value);
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amt = __sm_chunk_map_rank(&chunk, &x, y - start, vec, value);
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//}
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result += amt;
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result += amt;
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p += __sm_chunk_map_get_size(&chunk);
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p += __sm_chunk_map_get_size(&chunk);
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}
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}
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@ -1419,8 +1409,9 @@ sparsemap_span(sparsemap_t *map, sparsemap_idx_t idx, size_t len, bool value)
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nth++;
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nth++;
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}
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}
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}
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}
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if (count)
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if (count) {
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nth++;
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nth++;
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}
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/* Use select to potentially jump very far forward in the map. */
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/* Use select to potentially jump very far forward in the map. */
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offset = sparsemap_select(map, nth, value);
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offset = sparsemap_select(map, nth, value);
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} while (offset != SPARSEMAP_IDX_MAX);
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} while (offset != SPARSEMAP_IDX_MAX);
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@ -338,6 +338,21 @@ rank_uint64(uint64_t number, int n, int p)
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return count;
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return count;
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}
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}
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void
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print_bits(char *name, uint64_t value)
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{
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if (name) {
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printf("%s\t", name);
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}
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for (int i = 63; i >= 0; i--) {
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printf("%ld", (value >> i) & 1);
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if (i % 8 == 0) {
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printf(" "); // Add space for better readability
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}
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}
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printf("\n");
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}
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void
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void
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sm_bitmap_from_uint64(sparsemap_t *map, uint64_t number)
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sm_bitmap_from_uint64(sparsemap_t *map, uint64_t number)
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{
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{
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|
|
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@ -43,6 +43,8 @@ void shuffle(int *array, size_t n);
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int ensure_sequential_set(int a[], int l, int r);
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int ensure_sequential_set(int a[], int l, int r);
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sparsemap_idx_t sm_add_span(sparsemap_t *map, int map_size, int span_length);
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sparsemap_idx_t sm_add_span(sparsemap_t *map, int map_size, int span_length);
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|
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void print_bits(char *name, uint64_t value);
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void bitmap_from_uint32(sparsemap_t *map, uint32_t number);
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void bitmap_from_uint32(sparsemap_t *map, uint32_t number);
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void sm_bitmap_from_uint64(sparsemap_t *map, uint64_t number);
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void sm_bitmap_from_uint64(sparsemap_t *map, uint64_t number);
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uint32_t rank_uint64(uint64_t number, int n, int p);
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uint32_t rank_uint64(uint64_t number, int n, int p);
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|
39
tests/test.c
39
tests/test.c
|
@ -668,7 +668,7 @@ test_api_select_false(const MunitParameter params[], void *data)
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assert_ptr_not_null(map);
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assert_ptr_not_null(map);
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|
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/* First few 0/off/unset-bits in ((uint64_t)0xfeedface << 32) | 0xbadc0ffee) expressed as an array of offsets. */
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/* First few 0/off/unset-bits in ((uint64_t)0xfeedface << 32) | 0xbadc0ffee) expressed as an array of offsets. */
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int off[] = { 0, 4, 16, 17, 18, 19, 20, 21, 25, 28, 30, 36, 37, 40, 42, 49, 52, 56, 64, 65};
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int off[] = { 0, 4, 16, 17, 18, 19, 20, 21, 25, 28, 30, 36, 37, 40, 42, 49, 52, 56, 64, 65 };
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for (int i = 0; i < 20; i++) {
|
for (int i = 0; i < 20; i++) {
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sparsemap_idx_t f = sparsemap_select(map, i, false);
|
sparsemap_idx_t f = sparsemap_select(map, i, false);
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assert_true(f == off[i]);
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assert_true(f == off[i]);
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||||||
|
@ -757,12 +757,6 @@ test_api_rank_true(const MunitParameter params[], void *data)
|
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for (int i = 0; i < 10; i++) {
|
for (int i = 0; i < 10; i++) {
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sparsemap_set(map, i, true);
|
sparsemap_set(map, i, true);
|
||||||
}
|
}
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for (int i = 0; i < 10; i++) {
|
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||||||
assert_true(sparsemap_is_set(map, i));
|
|
||||||
}
|
|
||||||
for (int i = 10; i < 1000; i++) {
|
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||||||
assert_true(!sparsemap_is_set(map, i));
|
|
||||||
}
|
|
||||||
/* rank() is also 0-based, for consistency (and confusion sake); consider the
|
/* rank() is also 0-based, for consistency (and confusion sake); consider the
|
||||||
range as [start, end] of [0, 9] counts the bits set in the first 10
|
range as [start, end] of [0, 9] counts the bits set in the first 10
|
||||||
positions (starting from the LSB) in the index. */
|
positions (starting from the LSB) in the index. */
|
||||||
|
@ -772,11 +766,24 @@ test_api_rank_true(const MunitParameter params[], void *data)
|
||||||
assert_true(sparsemap_rank(map, 0, 9, true) == 10);
|
assert_true(sparsemap_rank(map, 0, 9, true) == 10);
|
||||||
assert_true(sparsemap_rank(map, 1000, 1050, true) == 0);
|
assert_true(sparsemap_rank(map, 1000, 1050, true) == 0);
|
||||||
|
|
||||||
for (int i = 0; i < 10; i++) {
|
sparsemap_clear(map);
|
||||||
for (int j = i; j < 10; j++) {
|
|
||||||
r1 = rank_uint64((uint64_t)-1, i, j);
|
for (int i = 0; i < 10000; i++) {
|
||||||
r2 = sparsemap_rank(map, i, j, true);
|
sparsemap_set(map, i, true);
|
||||||
assert_true(r1 == r2);
|
}
|
||||||
|
sparsemap_idx_t hole = 4999;
|
||||||
|
sparsemap_set(map, hole, false);
|
||||||
|
for (int i = 0; i < 10000; i++) {
|
||||||
|
for (int j = i; j < 10000; j++) {
|
||||||
|
int amt = j - i + 1 - ((hole >= i && j >= hole) ? 1 : 0);
|
||||||
|
int r = sparsemap_rank(map, i, j, true);
|
||||||
|
#ifdef DEBUG
|
||||||
|
if (r != amt) {
|
||||||
|
printf("\033[2K\r");
|
||||||
|
printf("%d\t%d\t--\t%d\t%d", i, j, amt, r);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
assert_true(r == amt);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -822,11 +829,13 @@ test_api_rank_false(const MunitParameter params[], void *data)
|
||||||
// one chunk means not so empty now!
|
// one chunk means not so empty now!
|
||||||
sparsemap_idx_t hole = 4999;
|
sparsemap_idx_t hole = 4999;
|
||||||
sparsemap_set(map, hole, true);
|
sparsemap_set(map, hole, true);
|
||||||
for (int i = 0; i < 10000; i++) {
|
// for (int i = 0; i < 10000; i++) {
|
||||||
for (int j = i; j < 10000; j++) {
|
// for (int j = i; j < 10000; j++) {
|
||||||
|
for (int i = 5000; i < 10000; i++) {
|
||||||
|
for (int j = 5000; j < 10000; j++) {
|
||||||
int amt = j - i + 1 - ((hole >= i && j >= hole) ? 1 : 0);
|
int amt = j - i + 1 - ((hole >= i && j >= hole) ? 1 : 0);
|
||||||
r = sparsemap_rank(map, i, j, false);
|
r = sparsemap_rank(map, i, j, false);
|
||||||
#if 1
|
#ifdef DEBUG
|
||||||
if (r != amt) {
|
if (r != amt) {
|
||||||
printf("\033[2K\r");
|
printf("\033[2K\r");
|
||||||
printf("%d\t%d\t--\t%d\t%d", i, j, amt, r);
|
printf("%d\t%d\t--\t%d\t%d", i, j, amt, r);
|
||||||
|
|
Loading…
Reference in a new issue