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(redundant_insn): If INSN or possible match has REG_UNUSED note, don't 

have match.

From-SVN: r14370
This commit is contained in:
Richard Kenner 1997-07-01 23:25:39 -04:00
parent 4144ff62cf
commit cbae24bcbe
1 changed files with 9 additions and 2 deletions
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11
gcc/reorg.c
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@ -1997,6 +1997,11 @@ redundant_insn (insn, target, delay_list)
struct resources needed, set;
int i;
/* If INSN has any REG_UNUSED notes, it can't match anything since we
are allowed to not actually assign to such a register. */
if (find_reg_note (insn, REG_UNUSED, NULL_RTX) != 0)
return 0;
/* Scan backwards looking for a match. */
for (trial = PREV_INSN (target); trial; trial = PREV_INSN (trial))
{
@ -2035,7 +2040,8 @@ redundant_insn (insn, target, delay_list)
resource requirements as we go. */
for (i = XVECLEN (pat, 0) - 1; i > 0; i--)
if (GET_CODE (XVECEXP (pat, 0, i)) == GET_CODE (insn)
&& rtx_equal_p (PATTERN (XVECEXP (pat, 0, i)), ipat))
&& rtx_equal_p (PATTERN (XVECEXP (pat, 0, i)), ipat)
&& ! find_reg_note (XVECEXP (pat, 0, i), REG_UNUSED, NULL_RTX))
break;
/* If found a match, exit this loop early. */
@ -2043,7 +2049,8 @@ redundant_insn (insn, target, delay_list)
break;
}
else if (GET_CODE (trial) == GET_CODE (insn) && rtx_equal_p (pat, ipat))
else if (GET_CODE (trial) == GET_CODE (insn) && rtx_equal_p (pat, ipat)
&& ! find_reg_note (trial, REG_UNUSED, NULL_RTX))
break;
}