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(make_extraction): Don't make an extraction that has the potential of

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crossing a boundary.

From-SVN: r6462
This commit is contained in:
Richard Kenner 1994-02-01 18:27:04 -05:00
parent 08d95f9128
commit e737355637
1 changed files with 10 additions and 0 deletions
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10
gcc/combine.c
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@ -5120,6 +5120,16 @@ make_extraction (mode, inner, pos, pos_rtx, len,
&& ! in_compare && ! spans_byte && unsignedp)
return 0;
/* Unless we are allowed to span bytes, reject this if we would be
spanning bytes or if the position is not a constant and the length
is not 1. In all other cases, we would only be going outside
out object in cases when an original shift would have been
undefined. */
if (! spans_byte
&& ((pos_rtx == 0 && pos + len > GET_MODE_BITSIZE (is_mode))
|| (pos_rtx != 0 && len != 1)))
return 0;
/* Get the mode to use should INNER be a MEM, the mode for the position,
and the mode for the result. */
#ifdef HAVE_insv