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(store_field): If signed bitfield and want value, sign extend.

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From-SVN: r2504
This commit is contained in:
Richard Stallman 1992-10-18 05:09:47 +00:00
parent ca3e4a2f2d
commit 5c4d7cfb47
1 changed files with 10 additions and 1 deletions
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11
gcc/expr.c
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@ -2702,7 +2702,16 @@ store_field (target, bitsize, bitpos, mode, exp, value_mode,
/* If possible, avoid refetching from the bitfield itself. */
if (width_mask != 0
&& ! (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)))
return expand_and (temp, GEN_INT (width_mask), NULL_RTX);
{
rtx count;
enum machine_mode tmode;
if (unsignedp)
return expand_and (temp, GEN_INT (width_mask), NULL_RTX);
tmode = GET_MODE (temp);
count = build_int_2 (GET_MODE_BITSIZE (tmode) - bitsize, 0);
temp = expand_shift (LSHIFT_EXPR, tmode, temp, count, 0, 0);
return expand_shift (RSHIFT_EXPR, tmode, temp, count, 0, 0);
}
return extract_bit_field (target, bitsize, bitpos, unsignedp,
NULL_RTX, value_mode, 0, align,
total_size);