diff options
Diffstat (limited to 'gcc/loop-invariant.c')
| -rw-r--r-- | gcc/loop-invariant.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/gcc/loop-invariant.c b/gcc/loop-invariant.c index dc35ace..a909e64 100644 --- a/gcc/loop-invariant.c +++ b/gcc/loop-invariant.c @@ -796,9 +796,22 @@ move_invariant_reg (struct loop *loop, unsigned invno, struct df *df) reg = gen_reg_rtx (GET_MODE (SET_DEST (set))); df_pattern_emit_after (df, gen_move_insn (SET_DEST (set), reg), BLOCK_FOR_INSN (inv->insn), inv->insn); - df_pattern_emit_after (df, gen_move_insn (reg, SET_SRC (set)), - preheader, BB_END (preheader)); - df_insn_delete (df, BLOCK_FOR_INSN (inv->insn), inv->insn); + + /* If the SET_DEST of the invariant insn is a reg, we can just move + the insn out of the loop. Otherwise, we have to use gen_move_insn + to let emit_move_insn produce a valid instruction stream. */ + if (REG_P (SET_DEST (set))) + { + SET_DEST (set) = reg; + reorder_insns (inv->insn, inv->insn, BB_END (preheader)); + df_insn_modify (df, preheader, inv->insn); + } + else + { + df_pattern_emit_after (df, gen_move_insn (reg, SET_SRC (set)), + preheader, BB_END (preheader)); + df_insn_delete (df, BLOCK_FOR_INSN (inv->insn), inv->insn); + } /* Replace the uses we know to be dominated. It saves work for copy propagation, and also it is necessary so that dependent invariants |