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Revert the revert: 

2013-10-26  Vladimir Makarov  <vmakarov@redhat.com>

	Revert:
	2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>

	* lra-spills.c (lra_final_code_change): Remove useless move insns.

From-SVN: r266358
This commit is contained in:
Uros Bizjak 2018-11-21 22:52:06 +01:00 committed by Uros Bizjak
parent 4fd723f869
commit 13986a58e7
2 changed files with 25 additions and 0 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2018-11-21 Uros Bizjak <ubizjak@gmail.com>
Revert the revert:
2013-10-26 Vladimir Makarov <vmakarov@redhat.com>
Revert:
2013-10-25 Vladimir Makarov <vmakarov@redhat.com>
* lra-spills.c (lra_final_code_change): Remove useless move insns.
2018-11-21 Uros Bizjak <ubizjak@gmail.com>
PR middle-end/88129

15
gcc/lra-spills.c
View File

@ -740,6 +740,7 @@ lra_final_code_change (void)
int i, hard_regno;
basic_block bb;
rtx_insn *insn, *curr;
rtx set;
int max_regno = max_reg_num ();
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
@ -818,5 +819,19 @@ lra_final_code_change (void)
}
if (insn_change_p)
lra_update_operator_dups (id);
if ((set = single_set (insn)) != NULL
&& REG_P (SET_SRC (set)) && REG_P (SET_DEST (set))
&& REGNO (SET_SRC (set)) == REGNO (SET_DEST (set)))
{
/* Remove an useless move insn. IRA can generate move
insns involving pseudos. It is better remove them
earlier to speed up compiler a bit. It is also
better to do it here as they might not pass final RTL
check in LRA, (e.g. insn moving a control register
into itself). */
lra_invalidate_insn_data (insn);
delete_insn (insn);
}
}
}