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(fold_rtx, case MEM): Surround TRUNCATE for jump table entry with a CONST. 

(fold_rtx, case '1'): Handle operand 0 of a CONST.
(fold_rtx, case PLUS): Handle (const (minus (label_ref) (label_ref))).

From-SVN: r7832
This commit is contained in:
Richard Kenner 1994-07-30 12:58:42 -04:00
parent 96c9d70dda
commit 67a3773731
1 changed files with 32 additions and 8 deletions
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40
gcc/cse.c
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@ -5001,7 +5001,11 @@ fold_rtx (x, insn)
if (GET_MODE (table) != Pmode)
new = gen_rtx (TRUNCATE, GET_MODE (table), new);
return new;
/* Indicate this is a constant. This isn't a
valid form of CONST, but it will only be used
to fold the next insns and then discarded, so
it should be safe. */
return gen_rtx (CONST, GET_MODE (new), new);
}
}
}
@ -5174,13 +5178,26 @@ fold_rtx (x, insn)
switch (GET_RTX_CLASS (code))
{
case '1':
/* We can't simplify extension ops unless we know the original mode. */
if ((code == ZERO_EXTEND || code == SIGN_EXTEND)
&& mode_arg0 == VOIDmode)
break;
new = simplify_unary_operation (code, mode,
const_arg0 ? const_arg0 : folded_arg0,
mode_arg0);
{
int is_const = 0;
/* We can't simplify extension ops unless we know the
original mode. */
if ((code == ZERO_EXTEND || code == SIGN_EXTEND)
&& mode_arg0 == VOIDmode)
break;
/* If we had a CONST, strip it off and put it back later if we
fold. */
if (const_arg0 != 0 && GET_CODE (const_arg0) == CONST)
is_const = 1, const_arg0 = XEXP (const_arg0, 0);
new = simplify_unary_operation (code, mode,
const_arg0 ? const_arg0 : folded_arg0,
mode_arg0);
if (new != 0 && is_const)
new = gen_rtx (CONST, mode, new);
}
break;
case '<':
@ -5358,6 +5375,13 @@ fold_rtx (x, insn)
if (y != 0 && GET_CODE (XEXP (y, 1)) == LABEL_REF
&& XEXP (XEXP (y, 1), 0) == XEXP (const_arg1, 0))
return XEXP (y, 0);
/* Now try for a CONST of a MINUS like the above. */
if ((y = lookup_as_function (folded_arg0, 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_arg1, 0))
return XEXP (XEXP (y, 0), 0);
}
/* If second operand is a register equivalent to a negative