diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 21564403749..33de90c4988 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -12499,6 +12499,7 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1) i += HARD_REGNO_NREGS (i, reg_raw_mode[i])) { rtx piece = gen_rtx_REG (reg_raw_mode[i], i); + basic_block bb = BASIC_BLOCK (this_basic_block); if (! dead_or_set_p (place, piece) && ! reg_bitfield_target_p (piece, @@ -12510,6 +12511,34 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1) distribute_notes (new_note, place, place, NULL_RTX, NULL_RTX, NULL_RTX); } + else if (! refers_to_regno_p (i, i + 1, + PATTERN (place), 0) + && ! find_regno_fusage (place, USE, i)) + for (tem = PREV_INSN (place); ; + tem = PREV_INSN (tem)) + { + if (! INSN_P (tem)) + { + if (tem == bb->head) + { + SET_BIT (refresh_blocks, + this_basic_block); + need_refresh = 1; + break; + } + continue; + } + if (dead_or_set_p (tem, piece) + || reg_bitfield_target_p (piece, + PATTERN (tem))) + { + REG_NOTES (tem) + = gen_rtx_EXPR_LIST (REG_DEAD, piece, + REG_NOTES (tem)); + break; + } + } + } place = 0; |