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From-SVN: r1316
This commit is contained in:
Richard Kenner 1992-06-27 15:45:24 -04:00
parent 47545f760f
commit 02f4ada4da
1 changed files with 13 additions and 12 deletions
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25
gcc/combine.c
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@ -1483,6 +1483,7 @@ try_combine (i3, i2, i1)
/* If I2DEST is a hard register or the only use of a pseudo,
we can change its mode. */
if (GET_MODE (SET_DEST (newpat)) != GET_MODE (i2dest)
&& GET_MODE (SET_DEST (newpat)) != VOIDmode
&& (REGNO (i2dest) < FIRST_PSEUDO_REGISTER
|| (reg_n_sets[REGNO (i2dest)] == 1 && ! added_sets_2
&& ! REG_USERVAR_P (i2dest))))
@ -2952,6 +2953,18 @@ subst (x, from, to, in_dest, unique_copy)
GET_MODE_BITSIZE (mode) - 1);
goto restart;
}
/* If we are adding two things that have no bits in common, convert
the addition into an IOR. This will often be further simplified,
for example in cases like ((a & 1) + (a & 2)), which can
become a & 3. */
if ((significant_bits (XEXP (x, 0), mode)
& significant_bits (XEXP (x, 1), mode)) == 0)
{
x = gen_binary (IOR, mode, XEXP (x, 0), XEXP (x, 1));
goto restart;
}
break;
case MINUS:
@ -2966,18 +2979,6 @@ subst (x, from, to, in_dest, unique_copy)
- INTVAL (XEXP (XEXP (x, 1), 1)) - 1);
goto restart;
}
/* If we are adding two things that have no bits in common, convert
the addition into an IOR. This will often be further simplified,
for example in cases like ((a & 1) + (a & 2)), which can
become a & 3. */
if ((significant_bits (XEXP (x, 0), mode)
& significant_bits (XEXP (x, 1), mode)) == 0)
{
x = gen_binary (IOR, mode, XEXP (x, 0), XEXP (x, 1));
goto restart;
}
break;
case MULT: