From: Sven Verdoolaege <skimo@kotnet.org>
Date: Sat, 11 Jul 2009 13:40:41 +0000 (+0200)
Subject: isl_tab: don't create new undo records during rollback
X-Git-Tag: isl-0.01~154
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=edb02fef62bd0f8bf73586b95a02b8cf34366d7a;p=platform%2Fupstream%2Fisl.git

isl_tab: don't create new undo records during rollback
---

diff --git a/isl_tab.c b/isl_tab.c
index cdb950b..4f2e783 100644
--- a/isl_tab.c
+++ b/isl_tab.c
@@ -51,6 +51,7 @@ struct isl_tab *isl_tab_alloc(struct isl_ctx *ctx,
 	tab->need_undo = 0;
 	tab->rational = 0;
 	tab->empty = 0;
+	tab->in_undo = 0;
 	tab->bottom.type = isl_tab_undo_bottom;
 	tab->bottom.next = NULL;
 	tab->top = &tab->bottom;
@@ -484,6 +485,8 @@ static void pivot(struct isl_ctx *ctx,
 	var = var_from_col(ctx, tab, col);
 	var->is_row = 0;
 	var->index = col;
+	if (tab->in_undo)
+		return;
 	for (i = tab->n_redundant; i < tab->n_row; ++i) {
 		if (isl_int_is_zero(mat->row[i][2 + col]))
 			continue;
@@ -1701,6 +1704,7 @@ int isl_tab_rollback(struct isl_ctx *ctx, struct isl_tab *tab,
 	if (!tab)
 		return -1;
 
+	tab->in_undo = 1;
 	for (undo = tab->top; undo && undo != &tab->bottom; undo = next) {
 		next = undo->next;
 		if (undo == snap)
@@ -1708,6 +1712,7 @@ int isl_tab_rollback(struct isl_ctx *ctx, struct isl_tab *tab,
 		perform_undo(ctx, tab, undo);
 		free(undo);
 	}
+	tab->in_undo = 0;
 	tab->top = undo;
 	if (!undo)
 		return -1;
diff --git a/isl_tab.h b/isl_tab.h
index 1df42e1..e747a9f 100644
--- a/isl_tab.h
+++ b/isl_tab.h
@@ -93,6 +93,7 @@ struct isl_tab {
 	unsigned need_undo : 1;
 	unsigned rational : 1;
 	unsigned empty : 1;
+	unsigned in_undo : 1;
 };
 
 struct isl_tab *isl_tab_alloc(struct isl_ctx *ctx,