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(try_combine): Restrict combining on CALL_INSNs. 

(distribute_{notes,links}): Look at CALL_INSN_FUNCTION_USAGE.

From-SVN: r7236
This commit is contained in:
Richard Kenner 1994-05-06 17:44:06 -04:00
parent 8f3e7a26bd
commit 6e2d1486ac
1 changed files with 22 additions and 1 deletions
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23
gcc/combine.c
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@ -1218,6 +1218,17 @@ try_combine (i3, i2, i1)
|| find_reg_note (i3, REG_LIBCALL, NULL_RTX))
return 0;
/* If I1 or I2 is an argument set insn, and I3 is the actual
CALL_INSN using it as argument, never combine the two.
This to prevent the elimination of insns that setup a
parameter register for a CALL_INSN. */
if (GET_CODE (i3) == CALL_INSN
&& (((temp = single_set (i2))
&& find_reg_fusage (i3, USE, SET_DEST (temp)))
|| (i1 && (temp = single_set (i1))
&& find_reg_fusage (i3, USE, SET_DEST (temp)))))
return 0;
combine_attempts++;
undobuf.num_undo = previous_num_undos = 0;
@ -10423,7 +10434,11 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1)
In both cases, we must search to see if we can find a previous
use of A and put the death note there. */
if (reg_referenced_p (XEXP (note, 0), PATTERN (i3)))
if (from_insn
&& GET_CODE (from_insn) == CALL_INSN
&& find_reg_fusage (from_insn, USE, XEXP (note, 0)))
place = from_insn;
else if (reg_referenced_p (XEXP (note, 0), PATTERN (i3)))
place = i3;
else if (i2 != 0 && next_nonnote_insn (i2) == i3
&& reg_referenced_p (XEXP (note, 0), PATTERN (i2)))
@ -10697,6 +10712,12 @@ distribute_links (links)
place = insn;
break;
}
else if (GET_CODE (insn) == CALL_INSN
&& find_reg_fusage (insn, USE, reg))
{
place = insn;
break;
}
/* If we found a place to put the link, place it there unless there
is already a link to the same insn as LINK at that point. */