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(move_block_from_reg): New argument SIZE.

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(move_block_from_reg): New argument SIZE.  If SIZE less
than word and BYTES_BIG_ENDIAN, shift block left to align it
before storing it to memory.

From-SVN: r5014
This commit is contained in:
Jim Wilson 1993-07-28 10:13:53 -07:00
parent 8498efd082
commit 0040593d86
1 changed files with 23 additions and 2 deletions
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25
gcc/expr.c
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@ -1460,17 +1460,38 @@ move_block_to_reg (regno, x, nregs, mode)
}
/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
The number of registers to be filled is NREGS. */
The number of registers to be filled is NREGS. SIZE indicates the number
of bytes in the object X. */
void
move_block_from_reg (regno, x, nregs)
move_block_from_reg (regno, x, nregs, size)
int regno;
rtx x;
int nregs;
int size;
{
int i;
rtx pat, last;
/* Blocks smaller than a word on a BYTES_BIG_ENDIAN machine must be aligned
to the left before storing to memory. */
if (size < UNITS_PER_WORD && BYTES_BIG_ENDIAN)
{
rtx tem = operand_subword (x, 0, 1, BLKmode);
rtx shift;
if (tem == 0)
abort ();
shift = expand_shift (LSHIFT_EXPR, word_mode,
gen_rtx (REG, word_mode, regno),
build_int_2 ((UNITS_PER_WORD - size)
* BITS_PER_UNIT, 0), NULL_RTX, 0);
emit_move_insn (tem, shift);
return;
}
/* See if the machine can do this with a store multiple insn. */
#ifdef HAVE_store_multiple
last = get_last_insn ();