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(expand_field_assignment): Take SUBREG_WORD into account when have STRICT_LOW_PART. 

(expand_field_assignment): Take SUBREG_WORD into account when have
STRICT_LOW_PART.
(make_extraction): Make a STRICT_LOW_PART at any low-order word.

From-SVN: r11775
This commit is contained in:
Richard Kenner 1996-04-15 05:12:16 -04:00
parent cf4403481d
commit 4d9cfc7b05
1 changed files with 10 additions and 8 deletions
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18
gcc/combine.c
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@ -4957,7 +4957,7 @@ expand_field_assignment (x)
{
inner = SUBREG_REG (XEXP (SET_DEST (x), 0));
len = GET_MODE_BITSIZE (GET_MODE (XEXP (SET_DEST (x), 0)));
pos = const0_rtx;
pos = GEN_INT (BITS_PER_WORD * SUBREG_WORD (XEXP (SET_DEST (x), 0)));
}
else if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT
&& GET_CODE (XEXP (SET_DEST (x), 1)) == CONST_INT)
@ -5133,7 +5133,8 @@ make_extraction (mode, inner, pos, pos_rtx, len,
if (tmode != BLKmode
&& ! (spans_byte && inner_mode != tmode)
&& ((pos_rtx == 0 && pos == 0 && GET_CODE (inner) != MEM
&& ((pos_rtx == 0 && (pos % BITS_PER_WORD) == 0
&& GET_CODE (inner) != MEM
&& (! in_dest
|| (GET_CODE (inner) == REG
&& (movstrict_optab->handlers[(int) tmode].insn_code
@ -5153,8 +5154,8 @@ make_extraction (mode, inner, pos, pos_rtx, len,
field. If the original and current mode are the same, we need not
adjust the offset. Otherwise, we do if bytes big endian.
If INNER is not a MEM, get a piece consisting of the just the field
of interest (in this case POS must be 0). */
If INNER is not a MEM, get a piece consisting of just the field
of interest (in this case POS % BITS_PER_WORD must be 0). */
if (GET_CODE (inner) == MEM)
{
@ -5178,10 +5179,11 @@ make_extraction (mode, inner, pos, pos_rtx, len,
new = gen_rtx (SUBREG, tmode, inner,
(WORDS_BIG_ENDIAN
&& GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD
? ((GET_MODE_SIZE (inner_mode)
- GET_MODE_SIZE (tmode))
/ UNITS_PER_WORD)
: 0));
? (((GET_MODE_SIZE (inner_mode)
- GET_MODE_SIZE (tmode))
/ UNITS_PER_WORD)
- pos / BITS_PER_WORD)
: pos / BITS_PER_WORD));
else
new = inner;
}