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aligner_bt.cpp
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aligner_bt.cpp
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/*
* Copyright 2011, Ben Langmead <[email protected]>
*
* This file is part of Bowtie 2.
*
* Bowtie 2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Bowtie 2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Bowtie 2. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aligner_bt.h"
#include "mask.h"
#include "aligner_swsse.h"
using namespace std;
#define CHECK_ROW_COL(rowc, colc) \
if(rowc >= 0 && colc >= 0) { \
if(!sawcell_[colc].insert(rowc)) { \
/* was already in there */ \
abort = true; \
return; \
} \
assert(local || prob_.cper_->debugCell(rowc, colc, hefc)); \
}
/**
* Fill in a triangle of the DP table and backtrace from the given cell to
* a cell in the previous checkpoint, or to the terminal cell.
*/
void BtBranchTracer::triangleFill(
int64_t rw, // row of cell to backtrace from
int64_t cl, // column of cell to backtrace from
int hef, // cell to backtrace from is H (0), E (1), or F (2)
TAlScore targ, // score of cell to backtrace from
TAlScore targ_final, // score of alignment we're looking for
RandomSource& rnd, // pseudo-random generator
int64_t& row_new, // out: row we ended up in after backtrace
int64_t& col_new, // out: column we ended up in after backtrace
int& hef_new, // out: H/E/F after backtrace
TAlScore& targ_new, // out: score up to cell we ended up in
bool& done, // out: finished tracing out an alignment?
bool& abort) // out: aborted b/c cell was seen before?
{
assert_geq(rw, 0);
assert_geq(cl, 0);
assert_range(0, 2, hef);
assert_lt(rw, (int64_t)prob_.qrylen_);
assert_lt(cl, (int64_t)prob_.reflen_);
assert(prob_.usecp_ && prob_.fill_);
int64_t row = rw, col = cl;
const int64_t colmin = 0;
const int64_t rowmin = 0;
const int64_t colmax = prob_.reflen_ - 1;
const int64_t rowmax = prob_.qrylen_ - 1;
assert_leq(prob_.reflen_, (TRefOff)sawcell_.size());
assert_leq(col, (int64_t)prob_.cper_->hicol());
assert_geq(col, (int64_t)prob_.cper_->locol());
assert_geq(prob_.cper_->per(), 2);
size_t mod = (row + col) & prob_.cper_->lomask();
assert_lt(mod, prob_.cper_->per());
// Allocate room for diags
size_t depth = mod+1;
assert_leq(depth, prob_.cper_->per());
size_t breadth = depth;
tri_.resize(depth);
// Allocate room for each diag
for(size_t i = 0; i < depth; i++) {
tri_[i].resize(breadth - i);
}
bool upperleft = false;
size_t off = (row + col) >> prob_.cper_->perpow2();
if(off == 0) {
upperleft = true;
} else {
off--;
}
const TAlScore sc_rdo = prob_.sc_->readGapOpen();
const TAlScore sc_rde = prob_.sc_->readGapExtend();
const TAlScore sc_rfo = prob_.sc_->refGapOpen();
const TAlScore sc_rfe = prob_.sc_->refGapExtend();
const bool local = !prob_.sc_->monotone;
int64_t row_lo = row - (int64_t)mod;
const CpQuad *prev2 = NULL, *prev1 = NULL;
if(!upperleft) {
// Read-only pointer to cells in diagonal -2. Start one row above the
// target row.
prev2 = prob_.cper_->qdiag1sPtr() + (off * prob_.cper_->nrow() + row_lo - 1);
// Read-only pointer to cells in diagonal -1. Start one row above the
// target row
prev1 = prob_.cper_->qdiag2sPtr() + (off * prob_.cper_->nrow() + row_lo - 1);
#ifndef NDEBUG
if(row >= (int64_t)mod) {
size_t rowc = row - mod, colc = col;
if(rowc > 0 && prob_.cper_->isCheckpointed(rowc-1, colc)) {
TAlScore al = prev1[0].sc[0];
if(al == MIN_I16) al = MIN_I64;
assert_eq(prob_.cper_->scoreTriangle(rowc-1, colc, 0), al);
}
if(rowc > 0 && colc > 0 && prob_.cper_->isCheckpointed(rowc-1, colc-1)) {
TAlScore al = prev2[0].sc[0];
if(al == MIN_I16) al = MIN_I64;
assert_eq(prob_.cper_->scoreTriangle(rowc-1, colc-1, 0), al);
}
}
#endif
}
// Pointer to cells in current diagonal
// For each diagonal we need to fill in
for(size_t i = 0; i < depth; i++) {
CpQuad * cur = tri_[i].ptr();
CpQuad * curc = cur;
size_t doff = mod - i; // # diagonals we are away from target diag
//assert_geq(row, (int64_t)doff);
int64_t rowc = row - doff;
int64_t colc = col;
size_t neval = 0; // # cells evaluated in this diag
ASSERT_ONLY(const CpQuad *last = NULL);
// Fill this diagonal from upper right to lower left
for(size_t j = 0; j < breadth; j++) {
if(rowc >= rowmin && rowc <= rowmax &&
colc >= colmin && colc <= colmax)
{
neval++;
int64_t fromend = prob_.qrylen_ - rowc - 1;
bool allowGaps = fromend >= prob_.sc_->gapbar && rowc >= prob_.sc_->gapbar;
// Fill this cell
// Some things we might want to calculate about this cell up front:
// 1. How many matches are possible from this cell to the cell in
// row, col, in case this allows us to prune
// Get character from read
int qc = prob_.qry_[rowc];
// Get quality value from read
int qq = prob_.qual_[rowc];
assert_geq(qq, 33);
// Get character from reference
int rc = prob_.ref_[colc];
assert_range(0, 16, rc);
int16_t sc_diag = prob_.sc_->score(qc, rc, qq - 33);
int16_t sc_h_up = MIN_I16;
int16_t sc_f_up = MIN_I16;
int16_t sc_h_lf = MIN_I16;
int16_t sc_e_lf = MIN_I16;
if(allowGaps) {
if(rowc > 0) {
assert(local || prev1[j+0].sc[2] < 0);
if(prev1[j+0].sc[0] > MIN_I16) {
sc_h_up = prev1[j+0].sc[0] - sc_rfo;
if(local) sc_h_up = max<int16_t>(sc_h_up, 0);
}
if(prev1[j+0].sc[2] > MIN_I16) {
sc_f_up = prev1[j+0].sc[2] - sc_rfe;
if(local) sc_f_up = max<int16_t>(sc_f_up, 0);
}
#ifndef NDEBUG
TAlScore hup = prev1[j+0].sc[0];
TAlScore fup = prev1[j+0].sc[2];
if(hup == MIN_I16) hup = MIN_I64;
if(fup == MIN_I16) fup = MIN_I64;
if(local) {
hup = max<int16_t>(hup, 0);
fup = max<int16_t>(fup, 0);
}
if(prob_.cper_->isCheckpointed(rowc-1, colc)) {
assert_eq(hup, prob_.cper_->scoreTriangle(rowc-1, colc, 0));
assert_eq(fup, prob_.cper_->scoreTriangle(rowc-1, colc, 2));
}
#endif
}
if(colc > 0) {
assert(local || prev1[j+1].sc[1] < 0);
if(prev1[j+1].sc[0] > MIN_I16) {
sc_h_lf = prev1[j+1].sc[0] - sc_rdo;
if(local) sc_h_lf = max<int16_t>(sc_h_lf, 0);
}
if(prev1[j+1].sc[1] > MIN_I16) {
sc_e_lf = prev1[j+1].sc[1] - sc_rde;
if(local) sc_e_lf = max<int16_t>(sc_e_lf, 0);
}
#ifndef NDEBUG
TAlScore hlf = prev1[j+1].sc[0];
TAlScore elf = prev1[j+1].sc[1];
if(hlf == MIN_I16) hlf = MIN_I64;
if(elf == MIN_I16) elf = MIN_I64;
if(local) {
hlf = max<int16_t>(hlf, 0);
elf = max<int16_t>(elf, 0);
}
if(prob_.cper_->isCheckpointed(rowc, colc-1)) {
assert_eq(hlf, prob_.cper_->scoreTriangle(rowc, colc-1, 0));
assert_eq(elf, prob_.cper_->scoreTriangle(rowc, colc-1, 1));
}
#endif
}
}
assert(rowc <= 1 || colc <= 0 || prev2 != NULL);
int16_t sc_h_dg = ((rowc > 0 && colc > 0) ? prev2[j+0].sc[0] : 0);
if(colc == 0 && rowc > 0 && !local) {
sc_h_dg = MIN_I16;
}
if(sc_h_dg > MIN_I16) {
sc_h_dg += sc_diag;
}
if(local) sc_h_dg = max<int16_t>(sc_h_dg, 0);
// cerr << sc_diag << " " << sc_h_dg << " " << sc_h_up << " " << sc_f_up << " " << sc_h_lf << " " << sc_e_lf << endl;
int mask = 0;
// Calculate best ways into H, E, F cells starting with H.
// Mask bits:
// H: 1=diag, 2=hhoriz, 4=ehoriz, 8=hvert, 16=fvert
// E: 32=hhoriz, 64=ehoriz
// F: 128=hvert, 256=fvert
int16_t sc_best = sc_h_dg;
if(sc_h_dg > MIN_I64) {
mask = 1;
}
if(colc > 0 && sc_h_lf >= sc_best && sc_h_lf > MIN_I64) {
if(sc_h_lf > sc_best) mask = 0;
mask |= 2;
sc_best = sc_h_lf;
}
if(colc > 0 && sc_e_lf >= sc_best && sc_e_lf > MIN_I64) {
if(sc_e_lf > sc_best) mask = 0;
mask |= 4;
sc_best = sc_e_lf;
}
if(rowc > 0 && sc_h_up >= sc_best && sc_h_up > MIN_I64) {
if(sc_h_up > sc_best) mask = 0;
mask |= 8;
sc_best = sc_h_up;
}
if(rowc > 0 && sc_f_up >= sc_best && sc_f_up > MIN_I64) {
if(sc_f_up > sc_best) mask = 0;
mask |= 16;
sc_best = sc_f_up;
}
// Calculate best way into E cell
int16_t sc_e_best = sc_h_lf;
if(colc > 0) {
if(sc_h_lf >= sc_e_lf && sc_h_lf > MIN_I64) {
if(sc_h_lf == sc_e_lf) {
mask |= 64;
}
mask |= 32;
} else if(sc_e_lf > MIN_I64) {
sc_e_best = sc_e_lf;
mask |= 64;
}
}
if(sc_e_best > sc_best) {
sc_best = sc_e_best;
mask &= ~31; // don't go diagonal
}
// Calculate best way into F cell
int16_t sc_f_best = sc_h_up;
if(rowc > 0) {
if(sc_h_up >= sc_f_up && sc_h_up > MIN_I64) {
if(sc_h_up == sc_f_up) {
mask |= 256;
}
mask |= 128;
} else if(sc_f_up > MIN_I64) {
sc_f_best = sc_f_up;
mask |= 256;
}
}
if(sc_f_best > sc_best) {
sc_best = sc_f_best;
mask &= ~127; // don't go horizontal or diagonal
}
// Install results in cur
assert(!prob_.sc_->monotone || sc_best <= 0);
assert(!prob_.sc_->monotone || sc_e_best <= 0);
assert(!prob_.sc_->monotone || sc_f_best <= 0);
curc->sc[0] = sc_best;
assert( local || sc_e_best < 0);
assert( local || sc_f_best < 0);
assert(!local || sc_e_best >= 0 || sc_e_best == MIN_I16);
assert(!local || sc_f_best >= 0 || sc_f_best == MIN_I16);
curc->sc[1] = sc_e_best;
curc->sc[2] = sc_f_best;
curc->sc[3] = mask;
// cerr << curc->sc[0] << " " << curc->sc[1] << " " << curc->sc[2] << " " << curc->sc[3] << endl;
ASSERT_ONLY(last = curc);
#ifndef NDEBUG
if(prob_.cper_->isCheckpointed(rowc, colc)) {
if(local) {
sc_e_best = max<int16_t>(sc_e_best, 0);
sc_f_best = max<int16_t>(sc_f_best, 0);
}
TAlScore sc_best64 = sc_best; if(sc_best == MIN_I16) sc_best64 = MIN_I64;
TAlScore sc_e_best64 = sc_e_best; if(sc_e_best == MIN_I16) sc_e_best64 = MIN_I64;
TAlScore sc_f_best64 = sc_f_best; if(sc_f_best == MIN_I16) sc_f_best64 = MIN_I64;
assert_eq(prob_.cper_->scoreTriangle(rowc, colc, 0), sc_best64);
assert_eq(prob_.cper_->scoreTriangle(rowc, colc, 1), sc_e_best64);
assert_eq(prob_.cper_->scoreTriangle(rowc, colc, 2), sc_f_best64);
}
#endif
}
// Update row, col
assert_lt(rowc, (int64_t)prob_.qrylen_);
rowc++;
colc--;
curc++;
} // for(size_t j = 0; j < breadth; j++)
if(i == depth-1) {
// Final iteration
assert(last != NULL);
assert_eq(1, neval);
assert_neq(0, last->sc[3]);
assert_eq(targ, last->sc[hef]);
} else {
breadth--;
prev2 = prev1 + 1;
prev1 = cur;
}
} // for(size_t i = 0; i < depth; i++)
//
// Now backtrack through the triangle. Abort as soon as we enter a cell
// that was visited by a previous backtrace.
//
int64_t rowc = row, colc = col;
size_t curid;
int hefc = hef;
if(bs_.empty()) {
// Start an initial branch
CHECK_ROW_COL(rowc, colc);
curid = bs_.alloc();
assert_eq(0, curid);
Edit e;
bs_[curid].init(
prob_,
0, // parent ID
0, // penalty
0, // score_en
rowc, // row
colc, // col
e, // edit
0, // hef
true, // I am the root
false); // don't try to extend with exact matches
bs_[curid].len_ = 0;
} else {
curid = bs_.size()-1;
}
size_t idx_orig = (row + col) >> prob_.cper_->perpow2();
while(true) {
// What depth are we?
size_t mod = (rowc + colc) & prob_.cper_->lomask();
assert_lt(mod, prob_.cper_->per());
CpQuad * cur = tri_[mod].ptr();
int64_t row_off = rowc - row_lo - mod;
assert(!local || cur[row_off].sc[0] > 0);
assert_geq(row_off, 0);
int mask = cur[row_off].sc[3];
assert_gt(mask, 0);
int sel = -1;
// Select what type of move to make, which depends on whether we're
// currently in H, E, F:
if(hefc == 0) {
if( (mask & 1) != 0) {
// diagonal
sel = 0;
} else if((mask & 8) != 0) {
// up to H
sel = 3;
} else if((mask & 16) != 0) {
// up to F
sel = 4;
} else if((mask & 2) != 0) {
// left to H
sel = 1;
} else if((mask & 4) != 0) {
// left to E
sel = 2;
}
} else if(hefc == 1) {
if( (mask & 32) != 0) {
// left to H
sel = 5;
} else if((mask & 64) != 0) {
// left to E
sel = 6;
}
} else {
assert_eq(2, hefc);
if( (mask & 128) != 0) {
// up to H
sel = 7;
} else if((mask & 256) != 0) {
// up to F
sel = 8;
}
}
assert_geq(sel, 0);
// Get character from read
int qc = prob_.qry_[rowc], qq = prob_.qual_[rowc];
// Get character from reference
int rc = prob_.ref_[colc];
assert_range(0, 16, rc);
// Now that we know what type of move to make, make it, updating our
// row and column and moving updating the branch.
if(sel == 0) {
assert_geq(rowc, 0);
assert_geq(colc, 0);
TAlScore scd = prob_.sc_->score(qc, rc, qq - 33);
if((rc & (1 << qc)) == 0) {
// Mismatch
size_t id = curid;
// Check if the previous branch was the initial (bottommost)
// branch with no matches. If so, the mismatch should be added
// to the initial branch, instead of starting a new branch.
bool empty = (bs_[curid].len_ == 0 && curid == 0);
if(!empty) {
id = bs_.alloc();
}
Edit e((int)rowc, mask2dna[rc], "ACGTN"[qc], EDIT_TYPE_MM);
assert_lt(scd, 0);
TAlScore score_en = bs_[curid].score_st_ + scd;
bs_[id].init(
prob_,
curid, // parent ID
-scd, // penalty
score_en, // score_en
rowc, // row
colc, // col
e, // edit
hefc, // hef
empty, // root?
false); // don't try to extend with exact matches
//assert(!local || bs_[id].score_st_ >= 0);
curid = id;
} else {
// Match
bs_[curid].score_st_ += prob_.sc_->match();
bs_[curid].len_++;
assert_leq((int64_t)bs_[curid].len_, bs_[curid].row_ + 1);
}
rowc--;
colc--;
assert(local || bs_[curid].score_st_ >= targ_final);
hefc = 0;
} else if((sel >= 1 && sel <= 2) || (sel >= 5 && sel <= 6)) {
assert_gt(colc, 0);
// Read gap
size_t id = bs_.alloc();
Edit e((int)rowc+1, mask2dna[rc], '-', EDIT_TYPE_READ_GAP);
TAlScore gapp = prob_.sc_->readGapOpen();
if(bs_[curid].len_ == 0 && bs_[curid].e_.inited() && bs_[curid].e_.isReadGap()) {
gapp = prob_.sc_->readGapExtend();
}
TAlScore score_en = bs_[curid].score_st_ - gapp;
bs_[id].init(
prob_,
curid, // parent ID
gapp, // penalty
score_en, // score_en
rowc, // row
colc-1, // col
e, // edit
hefc, // hef
false, // root?
false); // don't try to extend with exact matches
colc--;
curid = id;
assert( local || bs_[curid].score_st_ >= targ_final);
//assert(!local || bs_[curid].score_st_ >= 0);
if(sel == 1 || sel == 5) {
hefc = 0;
} else {
hefc = 1;
}
} else {
assert_gt(rowc, 0);
// Reference gap
size_t id = bs_.alloc();
Edit e((int)rowc, '-', "ACGTN"[qc], EDIT_TYPE_REF_GAP);
TAlScore gapp = prob_.sc_->refGapOpen();
if(bs_[curid].len_ == 0 && bs_[curid].e_.inited() && bs_[curid].e_.isRefGap()) {
gapp = prob_.sc_->refGapExtend();
}
TAlScore score_en = bs_[curid].score_st_ - gapp;
bs_[id].init(
prob_,
curid, // parent ID
gapp, // penalty
score_en, // score_en
rowc-1, // row
colc, // col
e, // edit
hefc, // hef
false, // root?
false); // don't try to extend with exact matches
rowc--;
curid = id;
//assert(!local || bs_[curid].score_st_ >= 0);
if(sel == 3 || sel == 7) {
hefc = 0;
} else {
hefc = 2;
}
}
CHECK_ROW_COL(rowc, colc);
size_t mod_new = (rowc + colc) & prob_.cper_->lomask();
size_t idx = (rowc + colc) >> prob_.cper_->perpow2();
assert_lt(mod_new, prob_.cper_->per());
int64_t row_off_new = rowc - row_lo - mod_new;
CpQuad * cur_new = NULL;
if(colc >= 0 && rowc >= 0 && idx == idx_orig) {
cur_new = tri_[mod_new].ptr();
}
bool hit_new_tri = (idx < idx_orig && colc >= 0 && rowc >= 0);
// Check whether we made it to the top row or to a cell with score 0
if(colc < 0 || rowc < 0 ||
(cur_new != NULL && (local && cur_new[row_off_new].sc[0] == 0)))
{
done = true;
assert(bs_[curid].isSolution(prob_));
addSolution(curid);
#ifndef NDEBUG
// A check to see if any two adjacent branches in the backtrace
// overlap. If they do, the whole alignment will be filtered out
// in trySolution(...)
size_t cur = curid;
if(!bs_[cur].root_) {
size_t next = bs_[cur].parentId_;
while(!bs_[next].root_) {
assert_neq(cur, next);
if(bs_[next].len_ != 0 || bs_[cur].len_ == 0) {
assert(!bs_[cur].overlap(prob_, bs_[next]));
}
cur = next;
next = bs_[cur].parentId_;
}
}
#endif
return;
}
if(hit_new_tri) {
assert(rowc < 0 || colc < 0 || prob_.cper_->isCheckpointed(rowc, colc));
row_new = rowc; col_new = colc;
hef_new = hefc;
done = false;
if(rowc < 0 || colc < 0) {
assert(local);
targ_new = 0;
} else {
targ_new = prob_.cper_->scoreTriangle(rowc, colc, hefc);
}
if(local && targ_new == 0) {
done = true;
assert(bs_[curid].isSolution(prob_));
addSolution(curid);
}
assert((row_new >= 0 && col_new >= 0) || done);
return;
}
}
assert(false);
}
#ifndef NDEBUG
#define DEBUG_CHECK(ss, row, col, hef) { \
if(prob_.cper_->debug() && row >= 0 && col >= 0) { \
TAlScore s = ss; \
if(s == MIN_I16) s = MIN_I64; \
if(local && s < 0) s = 0; \
TAlScore deb = prob_.cper_->debugCell(row, col, hef); \
if(local && deb < 0) deb = 0; \
assert_eq(s, deb); \
} \
}
#else
#define DEBUG_CHECK(ss, row, col, hef)
#endif
/**
* Fill in a square of the DP table and backtrace from the given cell to
* a cell in the previous checkpoint, or to the terminal cell.
*/
void BtBranchTracer::squareFill(
int64_t rw, // row of cell to backtrace from
int64_t cl, // column of cell to backtrace from
int hef, // cell to backtrace from is H (0), E (1), or F (2)
TAlScore targ, // score of cell to backtrace from
TAlScore targ_final, // score of alignment we're looking for
RandomSource& rnd, // pseudo-random generator
int64_t& row_new, // out: row we ended up in after backtrace
int64_t& col_new, // out: column we ended up in after backtrace
int& hef_new, // out: H/E/F after backtrace
TAlScore& targ_new, // out: score up to cell we ended up in
bool& done, // out: finished tracing out an alignment?
bool& abort) // out: aborted b/c cell was seen before?
{
assert_geq(rw, 0);
assert_geq(cl, 0);
assert_range(0, 2, hef);
assert_lt(rw, (int64_t)prob_.qrylen_);
assert_lt(cl, (int64_t)prob_.reflen_);
assert(prob_.usecp_ && prob_.fill_);
const bool is8_ = prob_.cper_->is8_;
int64_t row = rw, col = cl;
assert_leq(prob_.reflen_, (TRefOff)sawcell_.size());
assert_leq(col, (int64_t)prob_.cper_->hicol());
assert_geq(col, (int64_t)prob_.cper_->locol());
assert_geq(prob_.cper_->per(), 2);
size_t xmod = col & prob_.cper_->lomask();
size_t ymod = row & prob_.cper_->lomask();
size_t xdiv = col >> prob_.cper_->perpow2();
size_t ydiv = row >> prob_.cper_->perpow2();
size_t sq_ncol = xmod+1, sq_nrow = ymod+1;
sq_.resize(sq_ncol * sq_nrow);
bool upper = ydiv == 0;
bool left = xdiv == 0;
const TAlScore sc_rdo = prob_.sc_->readGapOpen();
const TAlScore sc_rde = prob_.sc_->readGapExtend();
const TAlScore sc_rfo = prob_.sc_->refGapOpen();
const TAlScore sc_rfe = prob_.sc_->refGapExtend();
const bool local = !prob_.sc_->monotone;
const CpQuad *qup = NULL;
const SSERegI *qlf = NULL;
size_t per = prob_.cper_->per_;
ASSERT_ONLY(size_t nrow = prob_.cper_->nrow());
size_t ncol = prob_.cper_->ncol();
assert_eq(prob_.qrylen_, nrow);
assert_eq(prob_.reflen_, (TRefOff)ncol);
size_t niter = prob_.cper_->niter_;
if(!upper) {
qup = prob_.cper_->qrows_.ptr() + (ncol * (ydiv-1)) + xdiv * per;
}
if(!left) {
// Set up the column pointers to point to the first SSERegI word in the
// relevant column
size_t off = (niter << 2) * (xdiv-1);
qlf = prob_.cper_->qcols_.ptr() + off;
}
size_t xedge = xdiv * per; // absolute offset of leftmost cell in square
size_t yedge = ydiv * per; // absolute offset of topmost cell in square
size_t xi = xedge, yi = yedge; // iterators for columns, rows
size_t ii = 0; // iterator into packed square
// Iterate over rows, then over columns
size_t regmod = yi % prob_.cper_->niter_;
size_t regdiv = yi / prob_.cper_->niter_;
int16_t sc_h_dg_lastrow = MIN_I16;
for(size_t i = 0; i <= ymod; i++, yi++) {
assert_lt(yi, nrow);
xi = xedge;
// Handling for first column is done outside the loop
size_t fromend = prob_.qrylen_ - yi - 1;
bool allowGaps = fromend >= (size_t)prob_.sc_->gapbar && yi >= (size_t)prob_.sc_->gapbar;
// Get character, quality from read
int qc = prob_.qry_[yi], qq = prob_.qual_[yi];
assert_geq(qq, 33);
int16_t sc_h_lf_last = MIN_I16;
int16_t sc_e_lf_last = MIN_I16;
for(size_t j = 0; j <= xmod; j++, xi++) {
assert_lt(xi, ncol);
// Get character from reference
int rc = prob_.ref_[xi];
assert_range(0, 16, rc);
int16_t sc_diag = prob_.sc_->score(qc, rc, qq - 33);
int16_t sc_h_up = MIN_I16, sc_f_up = MIN_I16,
sc_h_lf = MIN_I16, sc_e_lf = MIN_I16,
sc_h_dg = MIN_I16;
int16_t sc_h_up_c = MIN_I16, sc_f_up_c = MIN_I16,
sc_h_lf_c = MIN_I16, sc_e_lf_c = MIN_I16,
sc_h_dg_c = MIN_I16;
if(yi == 0) {
// If I'm in the first first row or column set it to 0
sc_h_dg = 0;
} else if(xi == 0) {
// Do nothing; leave it at min
if(local) {
sc_h_dg = 0;
}
} else if(i == 0 && j == 0) {
// Otherwise, if I'm in the upper-left square corner, I can get
// it from the checkpoint
sc_h_dg = qup[-1].sc[0];
} else if(j == 0) {
// Otherwise, if I'm in the leftmost cell of this row, I can
// get it from sc_h_lf in first column of previous row
sc_h_dg = sc_h_dg_lastrow;
} else {
// Otherwise, I can get it from qup
sc_h_dg = qup[j-1].sc[0];
}
if(yi > 0 && xi > 0) DEBUG_CHECK(sc_h_dg, yi-1, xi-1, 2);
// If we're in the leftmost column, calculate sc_h_lf regardless of
// allowGaps.
if(j == 0 && xi > 0) {
// Get values for left neighbors from the checkpoint
if(is8_) {
size_t vecoff = (regmod << (ROWSTRIDE_LOG2+BYTES_LOG2_PER_REG)) + regdiv;
sc_e_lf = ((uint8_t*)(qlf + 0))[vecoff];
sc_h_lf = ((uint8_t*)(qlf + 2))[vecoff];
if(local) {
// No adjustment
} else {
if(sc_h_lf == 0) sc_h_lf = MIN_I16;
else sc_h_lf -= 0xff;
if(sc_e_lf == 0) sc_e_lf = MIN_I16;
else sc_e_lf -= 0xff;
}
} else {
size_t vecoff = (regmod << (ROWSTRIDE_LOG2+BYTES_LOG2_PER_REG-1)) + regdiv;
sc_e_lf = ((int16_t*)(qlf + 0))[vecoff];
sc_h_lf = ((int16_t*)(qlf + 2))[vecoff];
if(local) {
sc_h_lf += 0x8000; assert_geq(sc_h_lf, 0);
sc_e_lf += 0x8000; assert_geq(sc_e_lf, 0);
} else {
if(sc_h_lf != MIN_I16) sc_h_lf -= 0x7fff;
if(sc_e_lf != MIN_I16) sc_e_lf -= 0x7fff;
}
}
DEBUG_CHECK(sc_e_lf, yi, xi-1, 0);
DEBUG_CHECK(sc_h_lf, yi, xi-1, 2);
sc_h_dg_lastrow = sc_h_lf;
}
if(allowGaps) {
if(j == 0 /* at left edge */ && xi > 0 /* not extreme */) {
sc_h_lf_c = sc_h_lf;
sc_e_lf_c = sc_e_lf;
if(sc_h_lf_c != MIN_I16) sc_h_lf_c -= sc_rdo;
if(sc_e_lf_c != MIN_I16) sc_e_lf_c -= sc_rde;
assert_leq(sc_h_lf_c, prob_.cper_->perf_);
assert_leq(sc_e_lf_c, prob_.cper_->perf_);
} else if(xi > 0) {
// Get values for left neighbors from the previous iteration
if(sc_h_lf_last != MIN_I16) {
sc_h_lf = sc_h_lf_last;
sc_h_lf_c = sc_h_lf - sc_rdo;
}
if(sc_e_lf_last != MIN_I16) {
sc_e_lf = sc_e_lf_last;
sc_e_lf_c = sc_e_lf - sc_rde;
}
}
if(yi > 0 /* not extreme */) {
// Get column values
assert(qup != NULL);
assert(local || qup[j].sc[2] < 0);
if(qup[j].sc[0] > MIN_I16) {
DEBUG_CHECK(qup[j].sc[0], yi-1, xi, 2);
sc_h_up = qup[j].sc[0];
sc_h_up_c = sc_h_up - sc_rfo;
}
if(qup[j].sc[2] > MIN_I16) {
DEBUG_CHECK(qup[j].sc[2], yi-1, xi, 1);
sc_f_up = qup[j].sc[2];
sc_f_up_c = sc_f_up - sc_rfe;
}
}
if(local) {
sc_h_up_c = max<int16_t>(sc_h_up_c, 0);
sc_f_up_c = max<int16_t>(sc_f_up_c, 0);
sc_h_lf_c = max<int16_t>(sc_h_lf_c, 0);
sc_e_lf_c = max<int16_t>(sc_e_lf_c, 0);
}
}
if(sc_h_dg > MIN_I16) {
sc_h_dg_c = sc_h_dg + sc_diag;
}
if(local) sc_h_dg_c = max<int16_t>(sc_h_dg_c, 0);
int mask = 0;
// Calculate best ways into H, E, F cells starting with H.
// Mask bits:
// H: 1=diag, 2=hhoriz, 4=ehoriz, 8=hvert, 16=fvert
// E: 32=hhoriz, 64=ehoriz
// F: 128=hvert, 256=fvert
int16_t sc_best = sc_h_dg_c;
if(sc_h_dg_c > MIN_I64) {
mask = 1;
}
if(xi > 0 && sc_h_lf_c >= sc_best && sc_h_lf_c > MIN_I64) {
if(sc_h_lf_c > sc_best) mask = 0;
mask |= 2;
sc_best = sc_h_lf_c;
}
if(xi > 0 && sc_e_lf_c >= sc_best && sc_e_lf_c > MIN_I64) {
if(sc_e_lf_c > sc_best) mask = 0;
mask |= 4;
sc_best = sc_e_lf_c;
}
if(yi > 0 && sc_h_up_c >= sc_best && sc_h_up_c > MIN_I64) {
if(sc_h_up_c > sc_best) mask = 0;
mask |= 8;
sc_best = sc_h_up_c;
}
if(yi > 0 && sc_f_up_c >= sc_best && sc_f_up_c > MIN_I64) {
if(sc_f_up_c > sc_best) mask = 0;
mask |= 16;
sc_best = sc_f_up_c;
}
// Calculate best way into E cell
int16_t sc_e_best = sc_h_lf_c;
if(xi > 0) {
if(sc_h_lf_c >= sc_e_lf_c && sc_h_lf_c > MIN_I64) {
if(sc_h_lf_c == sc_e_lf_c) {
mask |= 64;
}
mask |= 32;
} else if(sc_e_lf_c > MIN_I64) {
sc_e_best = sc_e_lf_c;
mask |= 64;
}
}
if(sc_e_best > sc_best) {
sc_best = sc_e_best;
mask &= ~31; // don't go diagonal
}
// Calculate best way into F cell
int16_t sc_f_best = sc_h_up_c;
if(yi > 0) {
if(sc_h_up_c >= sc_f_up_c && sc_h_up_c > MIN_I64) {
if(sc_h_up_c == sc_f_up_c) {
mask |= 256;
}
mask |= 128;
} else if(sc_f_up_c > MIN_I64) {
sc_f_best = sc_f_up_c;
mask |= 256;
}
}
if(sc_f_best > sc_best) {
sc_best = sc_f_best;
mask &= ~127; // don't go horizontal or diagonal
}
// Install results in cur
assert( local || sc_best <= 0);
sq_[ii+j].sc[0] = sc_best;
assert( local || sc_e_best < 0);
assert( local || sc_f_best < 0);
assert(!local || sc_e_best >= 0 || sc_e_best == MIN_I16);
assert(!local || sc_f_best >= 0 || sc_f_best == MIN_I16);
sq_[ii+j].sc[1] = sc_e_best;
sq_[ii+j].sc[2] = sc_f_best;
sq_[ii+j].sc[3] = mask;
DEBUG_CHECK(sq_[ii+j].sc[0], yi, xi, 2); // H
DEBUG_CHECK(sq_[ii+j].sc[1], yi, xi, 0); // E
DEBUG_CHECK(sq_[ii+j].sc[2], yi, xi, 1); // F
// Update sc_h_lf_last, sc_e_lf_last
sc_h_lf_last = sc_best;
sc_e_lf_last = sc_e_best;
}
// Update regmod, regdiv
regmod++;
if(regmod == prob_.cper_->niter_) {
regmod = 0;
regdiv++;
}
// update qup
ii += sq_ncol;
// dimensions of sq_
qup = sq_.ptr() + sq_ncol * i;
}
assert_eq(targ, sq_[ymod * sq_ncol + xmod].sc[hef]);
//
// Now backtrack through the triangle. Abort as soon as we enter a cell
// that was visited by a previous backtrace.
//
int64_t rowc = row, colc = col;
size_t curid;
int hefc = hef;
if(bs_.empty()) {
// Start an initial branch
CHECK_ROW_COL(rowc, colc);
curid = bs_.alloc();
assert_eq(0, curid);
Edit e;
bs_[curid].init(
prob_,
0, // parent ID
0, // penalty
0, // score_en
rowc, // row
colc, // col
e, // edit
0, // hef
true, // root?
false); // don't try to extend with exact matches
bs_[curid].len_ = 0;
} else {
curid = bs_.size()-1;
}
size_t ymodTimesNcol = ymod * sq_ncol;
while(true) {
// What depth are we?
assert_eq(ymodTimesNcol, ymod * sq_ncol);
CpQuad * cur = sq_.ptr() + ymodTimesNcol + xmod;
int mask = cur->sc[3];
assert_gt(mask, 0);
int sel = -1;
// Select what type of move to make, which depends on whether we're
// currently in H, E, F:
if(hefc == 0) {
if( (mask & 1) != 0) {
// diagonal
sel = 0;
} else if((mask & 8) != 0) {
// up to H
sel = 3;
} else if((mask & 16) != 0) {
// up to F
sel = 4;
} else if((mask & 2) != 0) {
// left to H
sel = 1;
} else if((mask & 4) != 0) {
// left to E
sel = 2;
}
} else if(hefc == 1) {
if( (mask & 32) != 0) {
// left to H
sel = 5;
} else if((mask & 64) != 0) {
// left to E
sel = 6;
}
} else {
assert_eq(2, hefc);
if( (mask & 128) != 0) {
// up to H
sel = 7;
} else if((mask & 256) != 0) {
// up to F
sel = 8;
}
}
assert_geq(sel, 0);
// Get character from read
int qc = prob_.qry_[rowc], qq = prob_.qual_[rowc];
// Get character from reference
int rc = prob_.ref_[colc];
assert_range(0, 16, rc);
bool xexit = false, yexit = false;
// Now that we know what type of move to make, make it, updating our
// row and column and moving updating the branch.
if(sel == 0) {
assert_geq(rowc, 0);
assert_geq(colc, 0);
TAlScore scd = prob_.sc_->score(qc, rc, qq - 33);
if((rc & (1 << qc)) == 0) {
// Mismatch
size_t id = curid;
// Check if the previous branch was the initial (bottommost)
// branch with no matches. If so, the mismatch should be added
// to the initial branch, instead of starting a new branch.
bool empty = (bs_[curid].len_ == 0 && curid == 0);
if(!empty) {
id = bs_.alloc();
}
Edit e((int)rowc, mask2dna[rc], "ACGTN"[qc], EDIT_TYPE_MM);
assert_lt(scd, 0);
TAlScore score_en = bs_[curid].score_st_ + scd;
bs_[id].init(
prob_,
curid, // parent ID
-scd, // penalty
score_en, // score_en
rowc, // row
colc, // col
e, // edit
hefc, // hef
empty, // root?
false); // don't try to extend with exact matches
curid = id;
//assert(!local || bs_[curid].score_st_ >= 0);
} else {
// Match
bs_[curid].score_st_ += prob_.sc_->match();
bs_[curid].len_++;
assert_leq((int64_t)bs_[curid].len_, bs_[curid].row_ + 1);
}
if(xmod == 0) xexit = true;
if(ymod == 0) yexit = true;
rowc--; ymod--; ymodTimesNcol -= sq_ncol;
colc--; xmod--;
assert(local || bs_[curid].score_st_ >= targ_final);
hefc = 0;
} else if((sel >= 1 && sel <= 2) || (sel >= 5 && sel <= 6)) {
assert_gt(colc, 0);
// Read gap
size_t id = bs_.alloc();
Edit e((int)rowc+1, mask2dna[rc], '-', EDIT_TYPE_READ_GAP);