X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_equalities.c;h=68d2c89a6cdaa8aead8580b9ee0ac6bede0e4622;hb=56b22046c7d07e60f213a2a17100fb7b2650f6cb;hp=1b517b6ba52fa418c9b6a8deb32e21bf920b1857;hpb=61eefa8fe09982393c83beb48b487509c4135b13;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_equalities.c b/isl_equalities.c
index 1b517b6..68d2c89 100644
--- a/isl_equalities.c
+++ b/isl_equalities.c
@@ -1,5 +1,14 @@
-#include "isl_mat.h"
-#include "isl_seq.h"
+/*
+ * Copyright 2008-2009 Katholieke Universiteit Leuven
+ *
+ * Use of this software is governed by the GNU LGPLv2.1 license
+ *
+ * Written by Sven Verdoolaege, K.U.Leuven, Departement
+ * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
+ */
+
+#include <isl_mat_private.h>
+#include <isl/seq.h>
 #include "isl_map_private.h"
 #include "isl_equalities.h"
 
@@ -76,7 +85,7 @@ static struct isl_mat *particular_solution(struct isl_mat *B, struct isl_vec *d)
 	M = isl_mat_left_hermite(M, 0, &U, NULL);
 	if (!M || !U)
 		goto error;
-	H = isl_mat_sub_alloc(B->ctx, M->row, 0, B->n_row, 0, B->n_row);
+	H = isl_mat_sub_alloc(M, 0, B->n_row, 0, B->n_row);
 	H = isl_mat_lin_to_aff(H);
 	C = isl_mat_inverse_product(H, C);
 	if (!C)
@@ -89,8 +98,8 @@ static struct isl_mat *particular_solution(struct isl_mat *B, struct isl_vec *d)
 	if (i < B->n_row)
 		cst = isl_mat_alloc(B->ctx, B->n_row, 0);
 	else
-		cst = isl_mat_sub_alloc(C->ctx, C->row, 1, B->n_row, 0, 1);
-	T = isl_mat_sub_alloc(U->ctx, U->row, B->n_row, B->n_col - 1, 0, B->n_row);
+		cst = isl_mat_sub_alloc(C, 1, B->n_row, 0, 1);
+	T = isl_mat_sub_alloc(U, B->n_row, B->n_col - 1, 0, B->n_row);
 	cst = isl_mat_product(T, cst);
 	isl_mat_free(M);
 	isl_mat_free(C);
@@ -127,9 +136,6 @@ static struct isl_mat *parameter_compression_1(
 	isl_mat_col_mul(U, 0, d->block.data[0], 0);
 	U = isl_mat_lin_to_aff(U);
 	return U;
-error:
-	isl_mat_free(U);
-	return NULL;
 }
 
 /* Compute a common lattice of solutions to the linear modulo
@@ -149,7 +155,6 @@ static struct isl_mat *parameter_compression_multi(
 			struct isl_mat *B, struct isl_vec *d)
 {
 	int i, j, k;
-	int ok;
 	isl_int D;
 	struct isl_mat *A = NULL, *U = NULL;
 	struct isl_mat *T;
@@ -179,11 +184,15 @@ static struct isl_mat *parameter_compression_multi(
 						D, U->row[j][k]);
 	}
 	A = isl_mat_left_hermite(A, 0, NULL, NULL);
-	T = isl_mat_sub_alloc(A->ctx, A->row, 0, A->n_row, 0, A->n_row);
+	T = isl_mat_sub_alloc(A, 0, A->n_row, 0, A->n_row);
 	T = isl_mat_lin_to_aff(T);
+	if (!T)
+		goto error;
 	isl_int_set(T->row[0][0], D);
 	T = isl_mat_right_inverse(T);
-	isl_assert(ctx, isl_int_is_one(T->row[0][0]), goto error);
+	if (!T)
+		goto error;
+	isl_assert(T->ctx, isl_int_is_one(T->row[0][0]), goto error);
 	T = isl_mat_transpose(T);
 	isl_mat_free(A);
 	isl_mat_free(U);
@@ -244,7 +253,7 @@ error:
  * then we divide this row of A by the common factor, unless gcd(A_i) = 0.
  * In the later case, we simply drop the row (in both A and d).
  *
- * If there are no rows left in A, the G is the identity matrix. Otherwise,
+ * If there are no rows left in A, then G is the identity matrix. Otherwise,
  * for each row i, we now determine the lattice of integer vectors
  * that satisfies this row.  Let U_i be the unimodular extension of the
  * row A_i.  This unimodular extension exists because gcd(A_i) = 1.
@@ -301,7 +310,7 @@ struct isl_mat *isl_mat_parameter_compression(
 
 	if (!B || !d)
 		goto error;
-	isl_assert(ctx, B->n_row == d->size, goto error);
+	isl_assert(B->ctx, B->n_row == d->size, goto error);
 	cst = particular_solution(B, d);
 	if (!cst)
 		goto error;
@@ -367,12 +376,12 @@ error:
  *
  *		M x - c = 0
  *
- * this function computes unimodular transformation from a lower-dimensional
+ * this function computes a unimodular transformation from a lower-dimensional
  * space to the original space that bijectively maps the integer points x'
  * in the lower-dimensional space to the integer points x in the original
  * space that satisfy the equalities.
  *
- * The input is given as a matrix B = [ -c M ] and the out is a
+ * The input is given as a matrix B = [ -c M ] and the output is a
  * matrix that maps [1 x'] to [1 x].
  * If T2 is not NULL, then *T2 is set to a matrix mapping [1 x] to [1 x'].
  *
@@ -395,7 +404,7 @@ error:
  *
  * If any of the c' is non-integer, then the original set has no
  * integer solutions (since the x' are a unimodular transformation
- * of the x).
+ * of the x) and a zero-column matrix is returned.
  * Otherwise, the transformation is given by
  *
  *		x = U1 H1^{-1} c + U2 x2'
@@ -417,7 +426,7 @@ struct isl_mat *isl_mat_variable_compression(struct isl_mat *B,
 		goto error;
 
 	dim = B->n_col - 1;
-	H = isl_mat_sub_alloc(B->ctx, B->row, 0, B->n_row, 1, dim);
+	H = isl_mat_sub_alloc(B, 0, B->n_row, 1, dim);
 	H = isl_mat_left_hermite(H, 0, &U, T2);
 	if (!H || !U || (T2 && !*T2))
 		goto error;
@@ -432,7 +441,7 @@ struct isl_mat *isl_mat_variable_compression(struct isl_mat *B,
 		goto error;
 	isl_int_set_si(C->row[0][0], 1);
 	isl_mat_sub_neg(C->ctx, C->row+1, B->row, B->n_row, 0, 0, 1);
-	H1 = isl_mat_sub_alloc(H->ctx, H->row, 0, H->n_row, 0, H->n_row);
+	H1 = isl_mat_sub_alloc(H, 0, H->n_row, 0, H->n_row);
 	H1 = isl_mat_lin_to_aff(H1);
 	TC = isl_mat_inverse_product(H1, C);
 	if (!TC)
@@ -455,10 +464,9 @@ struct isl_mat *isl_mat_variable_compression(struct isl_mat *B,
 		}
 		isl_int_set_si(TC->row[0][0], 1);
 	}
-	U1 = isl_mat_sub_alloc(U->ctx, U->row, 0, U->n_row, 0, B->n_row);
+	U1 = isl_mat_sub_alloc(U, 0, U->n_row, 0, B->n_row);
 	U1 = isl_mat_lin_to_aff(U1);
-	U2 = isl_mat_sub_alloc(U->ctx, U->row, 0, U->n_row,
-				B->n_row, U->n_row - B->n_row);
+	U2 = isl_mat_sub_alloc(U, 0, U->n_row, B->n_row, U->n_row - B->n_row);
 	U2 = isl_mat_lin_to_aff(U2);
 	isl_mat_free(U);
 	TC = isl_mat_product(U1, TC);
@@ -497,14 +505,14 @@ static struct isl_basic_set *compress_variables(
 		*T2 = NULL;
 	if (!bset)
 		goto error;
-	isl_assert(ctx, isl_basic_set_n_param(bset) == 0, goto error);
-	isl_assert(ctx, bset->n_div == 0, goto error);
+	isl_assert(bset->ctx, isl_basic_set_n_param(bset) == 0, goto error);
+	isl_assert(bset->ctx, bset->n_div == 0, goto error);
 	dim = isl_basic_set_n_dim(bset);
-	isl_assert(ctx, bset->n_eq <= dim, goto error);
+	isl_assert(bset->ctx, bset->n_eq <= dim, goto error);
 	if (bset->n_eq == 0)
 		return bset;
 
-	B = isl_mat_sub_alloc(bset->ctx, bset->eq, 0, bset->n_eq, 0, 1 + dim);
+	B = isl_mat_sub_alloc6(bset->ctx, bset->eq, 0, bset->n_eq, 0, 1 + dim);
 	TC = isl_mat_variable_compression(B, T2);
 	if (!TC)
 		goto error;
@@ -550,6 +558,11 @@ error:
 /* Check if dimension dim belongs to a residue class
  *		i_dim \equiv r mod m
  * with m != 1 and if so return m in *modulo and r in *residue.
+ * As a special case, when i_dim has a fixed value v, then
+ * *modulo is set to 0 and *residue to v.
+ *
+ * If i_dim does not belong to such a residue class, then *modulo
+ * is set to 1 and *residue is set to 0.
  */
 int isl_basic_set_dim_residue_class(struct isl_basic_set *bset,
 	int pos, isl_int *modulo, isl_int *residue)
@@ -562,17 +575,24 @@ int isl_basic_set_dim_residue_class(struct isl_basic_set *bset,
 	if (!bset || !modulo || !residue)
 		return -1;
 
+	if (isl_basic_set_plain_dim_is_fixed(bset, pos, residue)) {
+		isl_int_set_si(*modulo, 0);
+		return 0;
+	}
+
 	ctx = bset->ctx;
 	total = isl_basic_set_total_dim(bset);
 	nparam = isl_basic_set_n_param(bset);
-	H = isl_mat_sub_alloc(bset->ctx, bset->eq, 0, bset->n_eq, 1, total);
+	H = isl_mat_sub_alloc6(bset->ctx, bset->eq, 0, bset->n_eq, 1, total);
 	H = isl_mat_left_hermite(H, 0, &U, NULL);
 	if (!H)
 		return -1;
 
 	isl_seq_gcd(U->row[nparam + pos]+bset->n_eq,
 			total-bset->n_eq, modulo);
-	if (isl_int_is_zero(*modulo) || isl_int_is_one(*modulo)) {
+	if (isl_int_is_zero(*modulo))
+		isl_int_set_si(*modulo, 1);
+	if (isl_int_is_one(*modulo)) {
 		isl_int_set_si(*residue, 0);
 		isl_mat_free(H);
 		isl_mat_free(U);
@@ -584,11 +604,11 @@ int isl_basic_set_dim_residue_class(struct isl_basic_set *bset,
 		goto error;
 	isl_int_set_si(C->row[0][0], 1);
 	isl_mat_sub_neg(C->ctx, C->row+1, bset->eq, bset->n_eq, 0, 0, 1);
-	H1 = isl_mat_sub_alloc(H->ctx, H->row, 0, H->n_row, 0, H->n_row);
+	H1 = isl_mat_sub_alloc(H, 0, H->n_row, 0, H->n_row);
 	H1 = isl_mat_lin_to_aff(H1);
 	C = isl_mat_inverse_product(H1, C);
 	isl_mat_free(H);
-	U1 = isl_mat_sub_alloc(U->ctx, U->row, nparam+pos, 1, 0, bset->n_eq);
+	U1 = isl_mat_sub_alloc(U, nparam+pos, 1, 0, bset->n_eq);
 	U1 = isl_mat_lin_to_aff(U1);
 	isl_mat_free(U);
 	C = isl_mat_product(U1, C);
@@ -598,7 +618,7 @@ int isl_basic_set_dim_residue_class(struct isl_basic_set *bset,
 		bset = isl_basic_set_copy(bset);
 		bset = isl_basic_set_set_to_empty(bset);
 		isl_basic_set_free(bset);
-		isl_int_set_si(*modulo, 0);
+		isl_int_set_si(*modulo, 1);
 		isl_int_set_si(*residue, 0);
 		return 0;
 	}
@@ -611,3 +631,67 @@ error:
 	isl_mat_free(U);
 	return -1;
 }
+
+/* Check if dimension dim belongs to a residue class
+ *		i_dim \equiv r mod m
+ * with m != 1 and if so return m in *modulo and r in *residue.
+ * As a special case, when i_dim has a fixed value v, then
+ * *modulo is set to 0 and *residue to v.
+ *
+ * If i_dim does not belong to such a residue class, then *modulo
+ * is set to 1 and *residue is set to 0.
+ */
+int isl_set_dim_residue_class(struct isl_set *set,
+	int pos, isl_int *modulo, isl_int *residue)
+{
+	isl_int m;
+	isl_int r;
+	int i;
+
+	if (!set || !modulo || !residue)
+		return -1;
+
+	if (set->n == 0) {
+		isl_int_set_si(*modulo, 0);
+		isl_int_set_si(*residue, 0);
+		return 0;
+	}
+
+	if (isl_basic_set_dim_residue_class(set->p[0], pos, modulo, residue)<0)
+		return -1;
+
+	if (set->n == 1)
+		return 0;
+
+	if (isl_int_is_one(*modulo))
+		return 0;
+
+	isl_int_init(m);
+	isl_int_init(r);
+
+	for (i = 1; i < set->n; ++i) {
+		if (isl_basic_set_dim_residue_class(set->p[0], pos, &m, &r) < 0)
+			goto error;
+		isl_int_gcd(*modulo, *modulo, m);
+		if (!isl_int_is_zero(*modulo))
+			isl_int_fdiv_r(*residue, *residue, *modulo);
+		if (isl_int_is_one(*modulo))
+			break;
+		if (!isl_int_is_zero(*modulo))
+			isl_int_fdiv_r(r, r, *modulo);
+		if (isl_int_ne(*residue, r)) {
+			isl_int_set_si(*modulo, 1);
+			isl_int_set_si(*residue, 0);
+			break;
+		}
+	}
+
+	isl_int_clear(m);
+	isl_int_clear(r);
+
+	return 0;
+error:
+	isl_int_clear(m);
+	isl_int_clear(r);
+	return -1;
+}