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In scm_ramapc, only check unrolled axes for emptiness

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* libguile/array-map.c: (scm_ramapc)
  - Don't check emptiness while preparing ra0, but only after kroll is known,
    and only before kroll. len = 0 will be caught by the unrolled loop.
  - Use ra0 axis length in unroll check depth for rest args, not ra1's.
  - Recover early exit feature when cproc returns 0.
This commit is contained in:
Daniel Llorens 2013-04-26 02:05:22 +02:00 • committed by Andy Wingo
parent 3ee4c76453
commit ce6fce6af3
1 changed files with 50 additions and 69 deletions
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113
libguile/array-map.c
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@ -113,74 +113,58 @@ cindk (SCM ra, ssize_t *ve, int kend)
int
scm_ramapc (void *cproc_ptr, SCM data, SCM ra0, SCM lra, const char *what)
{
SCM z, vra0, lvra, *plvra;
ssize_t *vi;
int k, kmax, kroll;
int (*cproc) () = cproc_ptr;
int empty = 0;
SCM z, va0, lva, *plva;
int k, kmax, kroll;
ssize_t *vi, inc;
size_t len;
/* Prepare reference argument. */
if (SCM_I_ARRAYP (ra0))
{
k = kmax = SCM_I_ARRAY_NDIM (ra0)-1;
vra0 = make1array (SCM_I_ARRAY_V (ra0), SCM_I_ARRAY_DIMS (ra0)[kmax].inc);
kmax = SCM_I_ARRAY_NDIM (ra0)-1;
inc = kmax < 0 ? 0 : SCM_I_ARRAY_DIMS (ra0)[kmax].inc;
va0 = make1array (SCM_I_ARRAY_V (ra0), inc);
/* Find unroll depth */
if (k > 0)
for (kroll = max(0, kmax); kroll > 0; --kroll)
{
ssize_t inc = SCM_I_ARRAY_DIMS (ra0)[k].inc;
do {
ssize_t dim = (UBND (ra0, k) - LBND (ra0, k) + 1);
empty = empty || (0 == dim);
inc *= dim;
--k;
} while (k >= 0 && inc == SCM_I_ARRAY_DIMS (ra0)[k].inc);
kroll = k+1;
inc *= (UBND (ra0, kroll) - LBND (ra0, kroll) + 1);
if (inc != SCM_I_ARRAY_DIMS (ra0)[kroll-1].inc)
break;
}
else
kroll = 0;
/* Check emptiness of not-unrolled axes. */
for (; k>=0; --k)
empty = empty || (0 == (UBND (ra0, k) - LBND (ra0, k) + 1));
}
else
{
kroll = kmax = 0;
vra0 = ra0 = make1array (ra0, 1);
empty = (0 == (UBND (ra0, 0) - LBND (ra0, 0) + 1));
va0 = ra0 = make1array (ra0, 1);
}
/* Prepare rest arguments. */
lvra = SCM_EOL;
plvra = &lvra;
lva = SCM_EOL;
plva = &lva;
for (z = lra; !scm_is_null (z); z = SCM_CDR (z))
{
SCM ra1 = SCM_CAR (z);
SCM vra1;
SCM va1, ra1 = SCM_CAR (z);
if (SCM_I_ARRAYP (ra1))
{
if (kmax != SCM_I_ARRAY_NDIM (ra1) - 1)
scm_misc_error (what, "array shape mismatch: ~S", scm_list_1 (ra0));
vra1 = make1array (SCM_I_ARRAY_V (ra1), SCM_I_ARRAY_DIMS (ra1)[kmax].inc);
inc = kmax < 0 ? 0 : SCM_I_ARRAY_DIMS (ra1)[kmax].inc;
va1 = make1array (SCM_I_ARRAY_V (ra1), inc);
/* Check unroll depth. */
k = kmax;
if (k > kroll)
for (k = kmax; k > kroll; --k)
{
ssize_t inc = SCM_I_ARRAY_DIMS (ra1)[k].inc;
do {
ssize_t l0 = LBND (ra0, k), u0 = UBND (ra0, k);
ssize_t l1 = LBND (ra1, k), u1 = UBND (ra1, k);
--k;
if (l0 == l1 && u0 == u1)
inc *= (u1 - l1 + 1);
else if (l0 >= l1 && u0 <= u1)
break;
else
if (l0 < LBND (ra1, k) || u0 > UBND (ra1, k))
scm_misc_error (what, "array shape mismatch: ~S", scm_list_1 (ra0));
} while (k >= kroll && inc == SCM_I_ARRAY_DIMS (ra1)[k].inc);
kroll = k + 1;
inc *= (u0 - l0 + 1);
if (inc != SCM_I_ARRAY_DIMS (ra1)[k-1].inc)
{
kroll = k;
break;
}
}
/* Check matching of not-unrolled axes. */
@ -192,27 +176,26 @@ scm_ramapc (void *cproc_ptr, SCM data, SCM ra0, SCM lra, const char *what)
{
if (kmax != 0)
scm_misc_error (what, "array shape mismatch: ~S", scm_list_1 (ra0));
vra1 = make1array (ra1, 1);
va1 = make1array (ra1, 1);
if (LBND (ra0, 0) < LBND (vra1, 0) || UBND (ra0, 0) > UBND (vra1, 0))
if (LBND (ra0, 0) < LBND (va1, 0) || UBND (ra0, 0) > UBND (va1, 0))
scm_misc_error (what, "array shape mismatch: ~S", scm_list_1 (ra0));
}
*plvra = scm_cons (vra1, SCM_EOL);
plvra = SCM_CDRLOC (*plvra);
*plva = scm_cons (va1, SCM_EOL);
plva = SCM_CDRLOC (*plva);
}
/* Set unrolled size. */
if (empty)
/* Check emptiness of not-unrolled axes. */
for (k = 0; k < kroll; ++k)
if (0 == (UBND (ra0, k) - LBND (ra0, k) + 1))
return 1;
else
{
size_t len = 1;
for (k = kroll; k <= kmax; ++k)
/* Set unrolled size. */
for (len = 1; k <= kmax; ++k)
len *= (UBND (ra0, k) - LBND (ra0, k) + 1);
UBND (vra0, 0) = len - 1;
for (z = lvra; !scm_is_null (z); z = SCM_CDR (z))
UBND (va0, 0) = len - 1;
for (z = lva; !scm_is_null (z); z = SCM_CDR (z))
UBND (SCM_CAR (z), 0) = len - 1;
}
/* Set starting indices and go. */
vi = scm_gc_malloc_pointerless (sizeof(ssize_t) * kroll, vi_gc_hint);
@ -223,24 +206,22 @@ scm_ramapc (void *cproc_ptr, SCM data, SCM ra0, SCM lra, const char *what)
if (k == kroll)
{
SCM y = lra;
SCM_I_ARRAY_BASE (vra0) = cindk (ra0, vi, kroll);
for (z = lvra; !scm_is_null (z); z = SCM_CDR (z), y = SCM_CDR (y))
SCM_I_ARRAY_BASE (va0) = cindk (ra0, vi, kroll);
for (z = lva; !scm_is_null (z); z = SCM_CDR (z), y = SCM_CDR (y))
SCM_I_ARRAY_BASE (SCM_CAR (z)) = cindk (SCM_CAR (y), vi, kroll);
if (SCM_UNBNDP (data))
cproc (vra0, lvra);
else
cproc (vra0, data, lvra);
k--;
if (! (SCM_UNBNDP (data) ? cproc (va0, lva) : cproc (va0, data, lva)))
return 0;
--k;
}
else if (vi[k] < SCM_I_ARRAY_DIMS (ra0)[k].ubnd)
else if (vi[k] < UBND (ra0, k))
{
vi[k]++;
k++;
++vi[k];
++k;
}
else
{
vi[k] = SCM_I_ARRAY_DIMS (ra0)[k].lbnd - 1;
k--;
vi[k] = LBND (ra0, k) - 1;
--k;
}
}
while (k >= 0);