diff options
| -rw-r--r-- | gcc/function.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/function.c b/gcc/function.c index 00b2fe7..af3d57b 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -3036,7 +3036,15 @@ assign_parm_setup_block (struct assign_parm_data_all *all, reg = gen_rtx_REG (word_mode, REGNO (entry_parm)); reg = convert_to_mode (mode, copy_to_reg (reg), 1); } - emit_move_insn (change_address (mem, mode, 0), reg); + + /* We use adjust_address to get a new MEM with the mode + changed. adjust_address is better than change_address + for this purpose because adjust_address does not lose + the MEM_EXPR associated with the MEM. + + If the MEM_EXPR is lost, then optimizations like DSE + assume the MEM escapes and thus is not subject to DSE. */ + emit_move_insn (adjust_address (mem, mode, 0), reg); } #ifdef BLOCK_REG_PADDING |