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(fold_rtx): When folding tablejump, allow LABEL_REF to be in arg0;

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also allow other arg to be MINUS, not just be equivalent to it.

From-SVN: r7939
This commit is contained in:
Richard Kenner 1994-08-17 18:03:37 -04:00
parent 9fb8a9748b
commit e650cbda8f
1 changed files with 25 additions and 2 deletions
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27
gcc/cse.c
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@ -5369,20 +5369,43 @@ fold_rtx (x, insn)
ADDR_DIFF_VEC table. */ ADDR_DIFF_VEC table. */
if (const_arg1 && GET_CODE (const_arg1) == LABEL_REF) if (const_arg1 && GET_CODE (const_arg1) == LABEL_REF)
{ {
rtx y = lookup_as_function (folded_arg0, MINUS); rtx y
= GET_CODE (folded_arg0) == MINUS ? folded_arg0
: lookup_as_function (folded_arg0, MINUS);
if (y != 0 && GET_CODE (XEXP (y, 1)) == LABEL_REF if (y != 0 && GET_CODE (XEXP (y, 1)) == LABEL_REF
&& XEXP (XEXP (y, 1), 0) == XEXP (const_arg1, 0)) && XEXP (XEXP (y, 1), 0) == XEXP (const_arg1, 0))
return XEXP (y, 0); return XEXP (y, 0);
/* Now try for a CONST of a MINUS like the above. */ /* Now try for a CONST of a MINUS like the above. */
if ((y = lookup_as_function (folded_arg0, CONST)) != 0 if ((y = (GET_CODE (folded_arg0) == CONST ? folded_arg0
: lookup_as_function (folded_arg0, CONST))) != 0
&& GET_CODE (XEXP (y, 0)) == MINUS && GET_CODE (XEXP (y, 0)) == MINUS
&& GET_CODE (XEXP (XEXP (y, 0), 1)) == LABEL_REF && GET_CODE (XEXP (XEXP (y, 0), 1)) == LABEL_REF
&& XEXP (XEXP (XEXP (y, 0),1), 0) == XEXP (const_arg1, 0)) && XEXP (XEXP (XEXP (y, 0),1), 0) == XEXP (const_arg1, 0))
return XEXP (XEXP (y, 0), 0); return XEXP (XEXP (y, 0), 0);
} }
/* Likewise if the operands are in the other order. */
if (const_arg0 && GET_CODE (const_arg0) == LABEL_REF)
{
rtx y
= GET_CODE (folded_arg1) == MINUS ? folded_arg1
: lookup_as_function (folded_arg1, MINUS);
if (y != 0 && GET_CODE (XEXP (y, 1)) == LABEL_REF
&& XEXP (XEXP (y, 1), 0) == XEXP (const_arg0, 0))
return XEXP (y, 0);
/* Now try for a CONST of a MINUS like the above. */
if ((y = (GET_CODE (folded_arg1) == CONST ? folded_arg1
: lookup_as_function (folded_arg1, CONST))) != 0
&& GET_CODE (XEXP (y, 0)) == MINUS
&& GET_CODE (XEXP (XEXP (y, 0), 1)) == LABEL_REF
&& XEXP (XEXP (XEXP (y, 0),1), 0) == XEXP (const_arg0, 0))
return XEXP (XEXP (y, 0), 0);
}
/* If second operand is a register equivalent to a negative /* If second operand is a register equivalent to a negative
CONST_INT, see if we can find a register equivalent to the CONST_INT, see if we can find a register equivalent to the
positive constant. Make a MINUS if so. Don't do this for positive constant. Make a MINUS if so. Don't do this for