diff options
Diffstat (limited to 'gcc/lra-lives.c')
| -rw-r--r-- | gcc/lra-lives.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/lra-lives.c b/gcc/lra-lives.c index 16e1f386b3e..5157c85895e 100644 --- a/gcc/lra-lives.c +++ b/gcc/lra-lives.c @@ -768,7 +768,15 @@ process_bb_lives (basic_block bb, int &curr_point, bool dead_insn_p) dst_regno = REGNO (SET_DEST (set)); if (dst_regno >= lra_constraint_new_regno_start && src_regno >= lra_constraint_new_regno_start) - lra_create_copy (dst_regno, src_regno, freq); + { + /* It might be still an original (non-reload) insn with + one unused output and a constraint requiring to use + the same reg for input/output operands. In this case + dst_regno and src_regno have the same value, we don't + need a misleading copy for this case. */ + if (dst_regno != src_regno) + lra_create_copy (dst_regno, src_regno, freq); + } else if (dst_regno >= lra_constraint_new_regno_start) { if ((hard_regno = src_regno) >= FIRST_PSEUDO_REGISTER) |