Mercurial > hg > CbC > CbC_gcc
diff gcc/cfgloopanal.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
---|---|
date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | a06113de4d67 |
children | f6334be47118 |
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--- a/gcc/cfgloopanal.c Sun Feb 07 18:28:00 2010 +0900 +++ b/gcc/cfgloopanal.c Fri Feb 12 23:39:51 2010 +0900 @@ -52,26 +52,6 @@ return true; } -/* Marks the edge E in graph G irreducible if it connects two vertices in the - same scc. */ - -static void -check_irred (struct graph *g, struct graph_edge *e) -{ - edge real = (edge) e->data; - - /* All edges should lead from a component with higher number to the - one with lower one. */ - gcc_assert (g->vertices[e->src].component >= g->vertices[e->dest].component); - - if (g->vertices[e->src].component != g->vertices[e->dest].component) - return; - - real->flags |= EDGE_IRREDUCIBLE_LOOP; - if (flow_bb_inside_loop_p (real->src->loop_father, real->dest)) - real->src->flags |= BB_IRREDUCIBLE_LOOP; -} - /* Marks blocks and edges that are part of non-recognized loops; i.e. we throw away all latch edges and mark blocks inside any remaining cycle. Everything is a bit complicated due to fact we do not want to do this @@ -84,10 +64,11 @@ #define LOOP_REPR(LOOP) ((LOOP)->num + last_basic_block) #define BB_REPR(BB) ((BB)->index + 1) -void +bool mark_irreducible_loops (void) { basic_block act; + struct graph_edge *ge; edge e; edge_iterator ei; int src, dest; @@ -95,6 +76,8 @@ struct graph *g; int num = number_of_loops (); struct loop *cloop; + bool irred_loop_found = false; + int i; gcc_assert (current_loops != NULL); @@ -154,11 +137,30 @@ graphds_scc (g, NULL); /* Mark the irreducible loops. */ - for_each_edge (g, check_irred); + for (i = 0; i < g->n_vertices; i++) + for (ge = g->vertices[i].succ; ge; ge = ge->succ_next) + { + edge real = (edge) ge->data; + /* edge E in graph G is irreducible if it connects two vertices in the + same scc. */ + + /* All edges should lead from a component with higher number to the + one with lower one. */ + gcc_assert (g->vertices[ge->src].component >= g->vertices[ge->dest].component); + + if (g->vertices[ge->src].component != g->vertices[ge->dest].component) + continue; + + real->flags |= EDGE_IRREDUCIBLE_LOOP; + irred_loop_found = true; + if (flow_bb_inside_loop_p (real->src->loop_father, real->dest)) + real->src->flags |= BB_IRREDUCIBLE_LOOP; + } free_graph (g); loops_state_set (LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS); + return irred_loop_found; } /* Counts number of insns inside LOOP. */ @@ -173,12 +175,14 @@ for (i = 0; i < loop->num_nodes; i++) { bb = bbs[i]; - ninsns++; - for (insn = BB_HEAD (bb); insn != BB_END (bb); insn = NEXT_INSN (insn)) - if (INSN_P (insn)) + FOR_BB_INSNS (bb, insn) + if (NONDEBUG_INSN_P (insn)) ninsns++; } - free(bbs); + free (bbs); + + if (!ninsns) + ninsns = 1; /* To avoid division by zero. */ return ninsns; } @@ -197,9 +201,9 @@ { bb = bbs[i]; - binsns = 1; - for (insn = BB_HEAD (bb); insn != BB_END (bb); insn = NEXT_INSN (insn)) - if (INSN_P (insn)) + binsns = 0; + FOR_BB_INSNS (bb, insn) + if (NONDEBUG_INSN_P (insn)) binsns++; ratio = loop->header->frequency == 0 @@ -207,7 +211,7 @@ : (bb->frequency * BB_FREQ_MAX) / loop->header->frequency; ninsns += binsns * ratio; } - free(bbs); + free (bbs); ninsns /= BB_FREQ_MAX; if (!ninsns)