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(validate_replace_rtx_1, case MINUS): New case.

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From-SVN: r13869
This commit is contained in:
Richard Kenner 1997-04-13 09:48:25 -04:00
parent eead6b5bda
commit 06140bdfa1
1 changed files with 16 additions and 3 deletions
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19
gcc/recog.c
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@ -1,5 +1,5 @@
/* Subroutines used by or related to instruction recognition.
Copyright (C) 1987, 88, 91-5, 1996 Free Software Foundation, Inc.
Copyright (C) 1987, 1988, 1991-6, 1997 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -374,15 +374,28 @@ validate_replace_rtx_1 (loc, from, to, object)
}
}
/* Note that if CODE's RTX_CLASS is "c" or "<" we will have already
done the substitution, otherwise we won't. */
switch (code)
{
case PLUS:
/* If we have have a PLUS whose second operand is now a CONST_INT, use
plus_constant to try to simplify it. */
if (GET_CODE (XEXP (x, 1)) == CONST_INT && XEXP (x, 1) == to)
validate_change (object, loc,
plus_constant (XEXP (x, 0), INTVAL (XEXP (x, 1))), 1);
validate_change (object, loc, plus_constant (XEXP (x, 0), INTVAL (to)),
1);
return;
case MINUS:
if (GET_CODE (to) == CONST_INT && XEXP (x, 1) == from)
{
validate_change (object, loc,
plus_constant (XEXP (x, 0), - INTVAL (to)),
1);
return;
}
break;
case ZERO_EXTEND:
case SIGN_EXTEND: