avoid excessive use of alloca -- it doesn't work on cygwin

[r27407]

diff --git a/ir/be/bespillslots.c b/ir/be/bespillslots.c
index fdf1922..eff37fd 100644 (file)
--- a/ir/be/bespillslots.c
+++ b/ir/be/bespillslots.c
@@ -348,16 +348,19 @@ static void do_greedy_coalescing(be_fec_env_t *env)
        int affinity_edge_count;
        bitset_t **interferences;
        int* spillslot_unionfind;
+       struct obstack data;
 
        spillcount = set_count(env->spills);
        if (spillcount == 0)
                return;
 
+       obstack_init(&data);
+
        DB((dbg, DBG_COALESCING, "Coalescing %d spillslots\n", spillcount));
 
-       interferences       = ALLOCAN(bitset_t*, spillcount);
-       spillslot_unionfind = ALLOCAN(int,       spillcount);
-       spilllist           = ALLOCAN(spill_t*,  spillcount);
+       interferences       = OALLOCN(&data, bitset_t*, spillcount);
+       spillslot_unionfind = OALLOCN(&data, int,       spillcount);
+       spilllist           = OALLOCN(&data, spill_t*,  spillcount);
 
        uf_init(spillslot_unionfind, spillcount);
 
@@ -372,7 +375,7 @@ static void do_greedy_coalescing(be_fec_env_t *env)
        }
 
        for (i = 0; i < spillcount; ++i) {
-               interferences[i] = bitset_alloca(spillcount);
+               interferences[i] = bitset_obstack_alloc(&data, spillcount);
        }
 
        /* construct interferences */
@@ -462,6 +465,7 @@ static void do_greedy_coalescing(be_fec_env_t *env)
        }
 
        /*dump_interference_graph(env, interferences, "after");*/
+       obstack_free(&data, 0);
 }