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(subst, case MINUS): Canonicalize (minus A (plus A B)).

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From-SVN: r6226
This commit is contained in:
Richard Kenner 1993-12-13 20:58:37 -05:00
parent 9e269f7292
commit 7bef86801b
1 changed files with 11 additions and 0 deletions
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11
gcc/combine.c
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@ -3564,6 +3564,17 @@ subst (x, from, to, in_dest, unique_copy)
- INTVAL (XEXP (XEXP (x, 1), 1)) - 1);
goto restart;
}
/* Canonicalize (minus A (plus B C)) to (minus (minus A B) C) for
integers. */
if (GET_CODE (XEXP (x, 1)) == PLUS && INTEGRAL_MODE_P (mode))
{
x = gen_binary (MINUS, mode,
gen_binary (MINUS, mode, XEXP (x, 0),
XEXP (XEXP (x, 1), 0)),
XEXP (XEXP (x, 1), 1));
goto restart;
}
break;
case MULT: