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(protect_from_queue): If (MEM (QUEUED ...)), modify a new MEM instead

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of the one we were passed.

From-SVN: r6375
This commit is contained in:
Richard Kenner 1994-01-10 19:23:47 -05:00
parent 4a86a6d20f
commit e9baa64402
1 changed files with 14 additions and 9 deletions
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23
gcc/expr.c
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@ -416,24 +416,29 @@ protect_from_queue (x, modify)
if (code != QUEUED)
{
/* A special hack for read access to (MEM (QUEUED ...))
to facilitate use of autoincrement.
Make a copy of the contents of the memory location
rather than a copy of the address, but not
if the value is of mode BLKmode. */
/* A special hack for read access to (MEM (QUEUED ...)) to facilitate
use of autoincrement. Make a copy of the contents of the memory
location rather than a copy of the address, but not if the value is
of mode BLKmode. Don't modify X in place since it might be
shared. */
if (code == MEM && GET_MODE (x) != BLKmode
&& GET_CODE (XEXP (x, 0)) == QUEUED && !modify)
{
register rtx y = XEXP (x, 0);
XEXP (x, 0) = QUEUED_VAR (y);
register rtx new = gen_rtx (MEM, GET_MODE (x), QUEUED_VAR (y));
MEM_IN_STRUCT_P (new) = MEM_IN_STRUCT_P (x);
RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (x);
MEM_VOLATILE_P (new) = MEM_VOLATILE_P (x);
if (QUEUED_INSN (y))
{
register rtx temp = gen_reg_rtx (GET_MODE (x));
emit_insn_before (gen_move_insn (temp, x),
register rtx temp = gen_reg_rtx (GET_MODE (new));
emit_insn_before (gen_move_insn (temp, new),
QUEUED_INSN (y));
return temp;
}
return x;
return new;
}
/* Otherwise, recursively protect the subexpressions of all
the kinds of rtx's that can contain a QUEUED. */