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(simplify_rtx): For (not (xor X C)) generate new rtx

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instead of modifying old rtx.

From-SVN: r7788
This commit is contained in:
Jim Wilson 1994-07-21 15:06:05 -07:00
parent 6fc7c517d5
commit 787745f56c
1 changed files with 1 additions and 4 deletions
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5
gcc/combine.c
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@ -3261,10 +3261,7 @@ simplify_rtx (x, op0_mode, last, in_dest)
&& (temp = simplify_unary_operation (NOT, mode,
XEXP (XEXP (x, 0), 1),
mode)) != 0)
{
SUBST (XEXP (XEXP (x, 0), 1), temp);
return XEXP (x, 0);
}
return gen_binary (XOR, mode, XEXP (XEXP (x, 0), 0), temp);
/* (not (ashift 1 X)) is (rotate ~1 X). We used to do this for operands
other than 1, but that is not valid. We could do a similar