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(make_extraction): Correct typo in force_to_mode call in previous change.

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Return 0 if pos+len out of range of want desired mode.

From-SVN: r11544
This commit is contained in:
Richard Kenner 1996-03-16 18:56:24 -05:00
parent ff352ceaa0
commit 9e74dc4154
1 changed files with 16 additions and 6 deletions
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22
gcc/combine.c
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@ -5321,13 +5321,23 @@ make_extraction (mode, inner, pos, pos_rtx, len,
}
}
/* If INNER is not memory, we can always get it into the proper mode. */
/* If INNER is not memory, we can always get it into the proper mode. If we
are changing its mode, POS must be a constant and smaller than the size
of the new mode. */
else if (GET_CODE (inner) != MEM)
inner = force_to_mode (inner, wanted_inner_mode,
pos_rtx || len + orig_pos >= HOST_BITS_PER_WIDE_INT
? GET_MODE_MASK (extraction_mode)
: (((HOST_WIDE_INT) 1 << len) - 1) << orig_pos,
NULL_RTX, 0);
{
if (GET_MODE (inner) != wanted_inner_mode
&& (pos_rtx != 0
|| orig_pos + len > GET_MODE_BITSIZE (wanted_inner_mode)))
return 0;
inner = force_to_mode (inner, wanted_inner_mode,
pos_rtx
|| len + orig_pos >= HOST_BITS_PER_WIDE_INT
? GET_MODE_MASK (wanted_inner_mode)
: (((HOST_WIDE_INT) 1 << len) - 1) << orig_pos,
NULL_RTX, 0);
}
/* Adjust mode of POS_RTX, if needed. If we want a wider mode, we
have to zero extend. Otherwise, we can just use a SUBREG. */