| #define global |
| #include "defs.h" |
| |
| typedef struct { |
| bodyptr pskip; /* body to skip in force evaluation */ |
| vector pos0; /* point at which to evaluate field */ |
| real phi0; /* computed potential at pos0 */ |
| vector acc0; /* computed acceleration at pos0 */ |
| } hgstruct, *hgsptr; |
| |
| /* |
| * WALKSUB: recursive routine to do hackwalk operation. |
| * p: pointer into body-tree |
| * dsq: size of box squared |
| */ |
| extern bool subdivp(nodeptr p, real dsq, real tolsq, hgstruct hg); |
| hgstruct walksub(nodeptr p, real dsq, real tolsq, hgstruct hg, int level); |
| hgstruct gravsub(nodeptr p, hgstruct hg); |
| |
| hgstruct walksub(nodeptr p, real dsq, real tolsq, hgstruct hg, int level) |
| { |
| register int k, i; |
| register nodeptr r; |
| nodeptr tmp[NSUB]; |
| |
| |
| if (subdivp(p, dsq, tolsq, hg)) { /* should p be opened? */ |
| for (k = 0; k < NSUB; k++) { /* loop over the subcells */ |
| r = Subp((cellptr) p)[k]; /* <-- 6.7% load penalty */ |
| if (r != NULL) /* does this one exist? */ |
| hg = walksub(r, dsq / 4.0, tolsq, hg, level+1); |
| } |
| } |
| else if (p != (nodeptr) hg.pskip) { /* should p be included? */ |
| hg = gravsub(p, hg); /* then use interaction */ |
| } |
| |
| |
| return hg; |
| } |
| |
| |
| |
| |
