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(preserve_temp_slots): If argument is REG, see if it is address of a

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temp slot we know about.

From-SVN: r6843
This commit is contained in:
Richard Kenner 1994-03-21 17:15:32 -05:00
parent 987c71d9bc
commit e3a771613f
1 changed files with 15 additions and 1 deletions
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16
gcc/function.c
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@ -946,9 +946,23 @@ preserve_temp_slots (x)
{
struct temp_slot *p;
if (x == 0)
return;
/* If X is a register that is being used as a pointer, see if we have
a temporary slot we know it points to. To be consistent with
the code below, we really should preserve all non-kept slots
if we can't find a match, but that seems to be much too costly. */
if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))
&& (p = find_temp_slot_from_address (x)) != 0)
{
p->level--;
return;
}
/* If X is not in memory or is at a constant address, it cannot be in
a temporary slot. */
if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
return;
/* First see if we can find a match. */