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(protect_from_queue): Don't alter an existing MEM.

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(convert_modes): Use X's mode (not OLDMODE) unless it is VOIDmode.

From-SVN: r5311
This commit is contained in:
Richard Stallman 1993-09-12 13:19:38 +00:00
parent 7056f7e883
commit 3f15938e00
1 changed files with 21 additions and 9 deletions
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30
gcc/expr.c
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@ -378,11 +378,24 @@ protect_from_queue (x, modify)
/* Otherwise, recursively protect the subexpressions of all
the kinds of rtx's that can contain a QUEUED. */
if (code == MEM)
XEXP (x, 0) = protect_from_queue (XEXP (x, 0), 0);
{
rtx tem = protect_from_queue (XEXP (x, 0), 0);
if (tem != XEXP (x, 0))
{
x = copy_rtx (x);
XEXP (x, 0) = tem;
}
}
else if (code == PLUS || code == MULT)
{
XEXP (x, 0) = protect_from_queue (XEXP (x, 0), 0);
XEXP (x, 1) = protect_from_queue (XEXP (x, 1), 0);
rtx new0 = protect_from_queue (XEXP (x, 0), 0);
rtx new1 = protect_from_queue (XEXP (x, 1), 0);
if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1))
{
x = copy_rtx (x);
XEXP (x, 0) = new0;
XEXP (x, 1) = new1;
}
}
return x;
}
@ -1108,12 +1121,8 @@ convert_modes (mode, oldmode, x, unsignedp)
{
register rtx temp;
if (GET_MODE (x) != mode)
if (GET_MODE (x) != VOIDmode)
oldmode = GET_MODE (x);
/* If X doesnt have a mode, and we didn't specify one,
we have a potential bug, so crash now and get it fixed. */
if (oldmode == VOIDmode)
abort ();
/* If FROM is a SUBREG that indicates that we have already done at least
the required extension, strip it. */
@ -7100,7 +7109,10 @@ expand_increment (exp, post)
if (post)
{
/* We have a true reference to the value in OP0.
If there is an insn to add or subtract in this mode, queue it. */
If there is an insn to add or subtract in this mode, queue it.
Queueing the increment insn avoids the register shuffling
that often results if we must increment now and first save
the old value for subsequent use. */
#if 0 /* Turned off to avoid making extra insn for indexed memref. */
op0 = stabilize (op0);