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(nonzero_bits): Fix reversed test for when we need to insert extra bits when sizes differ.

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(nonzero_bits): Fix reversed test for when we need to insert extra bits when
sizes differ.
(nonzero_bits, case EQ): Always return STORE_FLAG_VALUE when returning integer
mode; remove now-redundant test.

From-SVN: r5221
This commit is contained in:
Richard Kenner 1993-08-27 18:47:38 -04:00
parent 561260fe80
commit c6965c0fa2
1 changed files with 8 additions and 10 deletions
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18
gcc/combine.c
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@ -6381,7 +6381,7 @@ nonzero_bits (x, mode)
return nonzero; return nonzero;
#ifndef BYTE_LOADS_EXTEND #ifndef BYTE_LOADS_EXTEND
/* If X is wider than MODE, but both are a single word for both the host /* If MODE is wider than X, but both are a single word for both the host
and target machines, we can compute this from which bits of the and target machines, we can compute this from which bits of the
object might be nonzero in its own mode, taking into account the fact object might be nonzero in its own mode, taking into account the fact
that on many CISC machines, accessing an object in a wider mode that on many CISC machines, accessing an object in a wider mode
@ -6391,7 +6391,7 @@ nonzero_bits (x, mode)
if (GET_MODE (x) != VOIDmode && GET_MODE (x) != mode if (GET_MODE (x) != VOIDmode && GET_MODE (x) != mode
&& GET_MODE_BITSIZE (GET_MODE (x)) <= BITS_PER_WORD && GET_MODE_BITSIZE (GET_MODE (x)) <= BITS_PER_WORD
&& GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT && GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT
&& GET_MODE_BITSIZE (mode) < GET_MODE_BITSIZE (GET_MODE (x))) && GET_MODE_BITSIZE (mode) > GET_MODE_BITSIZE (GET_MODE (x)))
{ {
nonzero &= nonzero_bits (x, GET_MODE (x)); nonzero &= nonzero_bits (x, GET_MODE (x));
nonzero |= GET_MODE_MASK (mode) & ~ GET_MODE_MASK (GET_MODE (x)); nonzero |= GET_MODE_MASK (mode) & ~ GET_MODE_MASK (GET_MODE (x));
@ -6485,22 +6485,20 @@ nonzero_bits (x, mode)
break; break;
#endif #endif
#if STORE_FLAG_VALUE == 1
case EQ: case NE: case EQ: case NE:
case GT: case GTU: case GT: case GTU:
case LT: case LTU: case LT: case LTU:
case GE: case GEU: case GE: case GEU:
case LE: case LEU: case LE: case LEU:
if (GET_MODE_CLASS (mode) == MODE_INT) /* If this produces an integer result, we know which bits are set.
nonzero = 1; Code here used to clear bits outside the mode of X, but that is
now done above. */
/* A comparison operation only sets the bits given by its mode. The if (GET_MODE_CLASS (mode) == MODE_INT
rest are set undefined. */ && mode_width <= HOST_BITS_PER_WIDE_INT)
if (GET_MODE_SIZE (GET_MODE (x)) < mode_width) nonzero = STORE_FLAG_VALUE;
nonzero |= (GET_MODE_MASK (mode) & ~ GET_MODE_MASK (GET_MODE (x)));
break; break;
#endif
case NEG: case NEG:
if (num_sign_bit_copies (XEXP (x, 0), GET_MODE (x)) if (num_sign_bit_copies (XEXP (x, 0), GET_MODE (x))