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From-SVN: r1442
This commit is contained in:
Richard Kenner 1992-07-05 14:02:06 -04:00
parent 41c8016882
commit c767f54b88
1 changed files with 13 additions and 0 deletions
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13
gcc/combine.c
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@ -1520,6 +1520,19 @@ try_combine (i3, i2, i1)
i2_code_number = recog_for_combine (&newi2pat, i2, &new_i2_notes);
if (i2_code_number >= 0)
insn_code_number = recog_for_combine (&newpat, i3, &new_i3_notes);
/* It is possible that both insns now set the destination of I3.
If so, we must show an extra use of it and update
reg_significant. */
if (insn_code_number >= 0 && GET_CODE (SET_DEST (newpat)) == REG
&& GET_CODE (SET_DEST (newi2pat)) == REG
&& REGNO (SET_DEST (newpat)) == REGNO (SET_DEST (newi2pat)))
{
reg_n_sets[REGNO (SET_DEST (newpat))]++;
set_significant (SET_DEST (newi2pat), newi2pat);
set_significant (SET_DEST (newpat), newpat);
}
}
/* If we can split it and use I2DEST, go ahead and see if that