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Diffstat (limited to 'gcc/tree-ssa-threadupdate.c')
| -rw-r--r-- | gcc/tree-ssa-threadupdate.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/tree-ssa-threadupdate.c b/gcc/tree-ssa-threadupdate.c index 687eee0485a..018092a7a3a 100644 --- a/gcc/tree-ssa-threadupdate.c +++ b/gcc/tree-ssa-threadupdate.c @@ -661,6 +661,13 @@ thread_block (basic_block bb, bool noloop_only) /* We do not update dominance info. */ free_dominance_info (CDI_DOMINATORS); + /* We know we only thread through the loop header to loop exits. + Let the basic block duplication hook know we are not creating + a multiple entry loop. */ + if (noloop_only + && bb == bb->loop_father->header) + set_loop_copy (bb->loop_father, loop_outer (bb->loop_father)); + /* Now create duplicates of BB. Note that for a block with a high outgoing degree we can waste @@ -692,6 +699,10 @@ thread_block (basic_block bb, bool noloop_only) htab_delete (redirection_data); redirection_data = NULL; + if (noloop_only + && bb == bb->loop_father->header) + set_loop_copy (bb->loop_father, NULL); + /* Indicate to our caller whether or not any jumps were threaded. */ return local_info.jumps_threaded; } |