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Attach MEM_EXPR information when flushing BLKmode args to the stack - V2

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gcc/
	* function.c (assign_parm_setup_block): Use adjust_address instead
	of change_address to preserve MEM_EXPR and friends.
This commit is contained in:
Jeff Law 2021-07-20 14:49:54 -04:00
parent 00dcc88a0e
commit 818203714e
1 changed files with 9 additions and 1 deletions
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10
gcc/function.c
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@ -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