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(simplify_rtx, case TRUNCATE): Add. Use force_to_mode.

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(force_to_mode, case AND): Allow some simplifications when GET_MODE (x)
has more bits than HOST_BITS_PER_WIDE_INT.

From-SVN: r9479
This commit is contained in:
Jim Wilson 1995-04-26 11:08:54 -07:00
parent 99f762bff7
commit 2ca9ae17a9
1 changed files with 10 additions and 3 deletions
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13
gcc/combine.c
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@ -3447,6 +3447,13 @@ simplify_rtx (x, op0_mode, last, in_dest)
}
break;
case TRUNCATE:
if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
SUBST (XEXP (x, 0),
force_to_mode (XEXP (x, 0), GET_MODE (XEXP (x, 0)),
GET_MODE_MASK (mode), NULL_RTX, 0));
break;
case FLOAT_TRUNCATE:
/* (float_truncate:SF (float_extend:DF foo:SF)) = foo:SF. */
if (GET_CODE (XEXP (x, 0)) == FLOAT_EXTEND
@ -5765,8 +5772,7 @@ force_to_mode (x, mode, mask, reg, just_select)
whose constant is the AND of that constant with MASK. If it
remains an AND of MASK, delete it since it is redundant. */
if (GET_CODE (XEXP (x, 1)) == CONST_INT
&& GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT)
if (GET_CODE (XEXP (x, 1)) == CONST_INT)
{
x = simplify_and_const_int (x, op_mode, XEXP (x, 0),
mask & INTVAL (XEXP (x, 1)));
@ -5785,7 +5791,8 @@ force_to_mode (x, mode, mask, reg, just_select)
cheaper constant. */
if (GET_CODE (x) == AND && GET_CODE (XEXP (x, 1)) == CONST_INT
&& GET_MODE_MASK (GET_MODE (x)) != mask)
&& GET_MODE_MASK (GET_MODE (x)) != mask
&& GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT)
{
HOST_WIDE_INT cval = (INTVAL (XEXP (x, 1))
| (GET_MODE_MASK (GET_MODE (x)) & ~ mask));