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Diffstat (limited to 'gcc/tree-ssa-sink.c')
| -rw-r--r-- | gcc/tree-ssa-sink.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc/tree-ssa-sink.c b/gcc/tree-ssa-sink.c index d42b46a1801..0222dac1a4a 100644 --- a/gcc/tree-ssa-sink.c +++ b/gcc/tree-ssa-sink.c @@ -412,7 +412,15 @@ statement_sink_location (gimple stmt, basic_block frombb, && gimple_vdef (use_stmt) && operand_equal_p (gimple_assign_lhs (stmt), gimple_assign_lhs (use_stmt), 0)) - continue; + { + /* If use_stmt is or might be a nop assignment then USE_STMT + acts as a use as well as definition. */ + if (stmt != use_stmt + && ref_maybe_used_by_stmt_p (use_stmt, + gimple_assign_lhs (stmt))) + return false; + continue; + } if (gimple_code (use_stmt) != GIMPLE_PHI) return false; @@ -628,7 +636,7 @@ static void execute_sink_code (void) { loop_optimizer_init (LOOPS_NORMAL); - + split_critical_edges (); connect_infinite_loops_to_exit (); memset (&sink_stats, 0, sizeof (sink_stats)); calculate_dominance_info (CDI_DOMINATORS); |