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expr.c (expand_expr): When expanding TARGET_EXPRs...

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* expr.c (expand_expr): When expanding TARGET_EXPRs, make sure
        that they are only expanded once, after the first expansion,
        the rtl can be used without further expansions.

From-SVN: r1890
This commit is contained in:
Mike Stump 1992-08-19 01:33:35 +00:00
parent 7e70e7c5a6
commit ac993f4f60
1 changed files with 15 additions and 1 deletions
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16
gcc/expr.c
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@ -4641,7 +4641,12 @@ expand_expr (exp, target, tmode, modifier)
if (target == 0)
{
if (DECL_RTL (slot) != 0)
target = DECL_RTL (slot);
{
target = DECL_RTL (slot);
/* We have already expanded the slot, so don't do
it again. (mrs) */
return target;
}
else
{
target = assign_stack_temp (mode, int_size_in_bytes (type), 0);
@ -4651,6 +4656,15 @@ expand_expr (exp, target, tmode, modifier)
}
#if 0
/* I bet this needs to be done, and I bet that it needs to
be above, inside the else clause. The reason is
simple, how else is it going to get cleaned up? (mrs)
The reason is probably did not work before, and was
commented out is because this was re-expanding already
expanded target_exprs (target == 0 and DECL_RTL (slot)
!= 0) also cleaning them up many times as well. :-( */
/* Since SLOT is not known to the called function
to belong to its stack frame, we must build an explicit
cleanup. This case occurs when we must build up a reference