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(store_field): If storing a record on big endian targets, 

set up so we store the high-order bits.
(expand_expr, case COMPONENT_REF): Likewise for loads.

From-SVN: r12714
This commit is contained in:
Richard Kenner 1996-09-14 20:42:46 -04:00
parent 853e0b2def
commit ef19912d09
1 changed files with 24 additions and 0 deletions
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24
gcc/expr.c
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@ -4105,6 +4105,18 @@ store_field (target, bitsize, bitpos, mode, exp, value_mode,
{
rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
/* If BITSIZE is narrower than the size of the type of EXP
we will be narrowing TEMP. Normally, what's wanted are the
low-order bits. However, if EXP's type is a record and this is
big-endian machine, we want the upper BITSIZE bits. */
if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
&& bitsize < GET_MODE_BITSIZE (GET_MODE (temp))
&& TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
size_int (GET_MODE_BITSIZE (GET_MODE (temp))
- bitsize),
temp, 1);
/* Unless MODE is VOIDmode or BLKmode, convert TEMP to
MODE. */
if (mode != VOIDmode && mode != BLKmode
@ -5595,6 +5607,18 @@ expand_expr (exp, target, tmode, modifier)
unsignedp, target, ext_mode, ext_mode,
alignment,
int_size_in_bytes (TREE_TYPE (tem)));
/* If the result is a record type and BITSIZE is narrower than
the mode of OP0, an integral mode, and this is a big endian
machine, we must put the field into the high-order bits. */
if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
&& GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
&& bitsize < GET_MODE_BITSIZE (GET_MODE (op0)))
op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
size_int (GET_MODE_BITSIZE (GET_MODE (op0))
- bitsize),
op0, 1);
if (mode == BLKmode)
{
rtx new = assign_stack_temp (ext_mode,