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regclass.c (record_reg_classes): Do not do the copying preferrencing when source does not die.

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* regclass.c  (record_reg_classes): Do not do the copying preferrencing
	when source does not die.

From-SVN: r30913
This commit is contained in:
Jan Hubicka 1999-12-14 12:10:11 +01:00 • committed by Jan Hubicka
parent d5e2075dbf
commit 0dc0641b04
2 changed files with 9 additions and 2 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Tue Dec 14 12:07:29 MET 1999 Jan Hubicka <hubicka@freesoft.cz>
* regclass.c (record_reg_classes): Do not do the copying preferrencing
when source does not die.
* regclass.c (record_reg_classes): Handle INOUT operands propertly.
1999-12-14 Jakub Jelinek <jakub@redhat.com>

8
gcc/regclass.c
View file

@ -1618,11 +1618,15 @@ record_reg_classes (n_alts, n_ops, ops, modes, subreg_changes_size,
/* If this insn is a single set copying operand 1 to operand 0
and one is a pseudo with the other a hard reg that is in its
own register class, set the cost of that register class to -1. */
own register class, set the cost of that register class to -1.
Do this only when source dies to avoid stressing of register
allocator by preferrencing two coliding registers into single
place. */
if ((set = single_set (insn)) != 0
&& ops[0] == SET_DEST (set) && ops[1] == SET_SRC (set)
&& GET_CODE (ops[0]) == REG && GET_CODE (ops[1]) == REG)
&& GET_CODE (ops[0]) == REG && GET_CODE (ops[1]) == REG
&& find_regno_note (insn, REG_DEAD, REGNO (ops[1])))
for (i = 0; i <= 1; i++)
if (REGNO (ops[i]) >= FIRST_PSEUDO_REGISTER)
{