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function.c (purge_addressof_1): In (mem (addressof (reg))) case for reg notes...

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* function.c (purge_addressof_1): In (mem (addressof (reg))) case
	for reg notes, if there are no substitutions, just use a SUBREG.

From-SVN: r65934
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J"orn Rennecke 2003-04-22 11:41:58 +00:00 committed by Joern Rennecke
parent 6adb9463cd
commit 277b3b18b3
2 changed files with 35 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-04-22 J"orn Rennecke <joern.rennecke@superh.com>
* function.c (purge_addressof_1): In (mem (addressof (reg))) case
for reg notes, if there are no substitutions, just use a SUBREG.
2003-04-21 Mark Mitchell <mark@codesourcery.com>
* Makefile.in (calls.o): Depend on except.h.

30
gcc/function.c
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@ -3147,6 +3147,36 @@ purge_addressof_1 (loc, insn, force, store, may_postpone, ht)
return true;
}
/* When we are processing the REG_NOTES of the last instruction
of a libcall, there will be typically no replacements
for that insn; the replacements happened before, piecemeal
fashion. OTOH we are not interested in the details of
this for the REG_EQUAL note, we want to know the big picture,
which can be succinctly described with a simple SUBREG.
Note that removing the REG_EQUAL note is not an option
on the last insn of a libcall, so we must do a replacement. */
if (! purge_addressof_replacements
&& ! purge_bitfield_addressof_replacements)
{
/* In compile/990107-1.c:7 compiled at -O1 -m1 for sh-elf,
we got
(mem:DI (addressof:SI (reg/v:DF 160) 159 0x401c8510)
[0 S8 A32]), which can be expressed with a simple
same-size subreg */
if ((GET_MODE_SIZE (GET_MODE (x))
== GET_MODE_SIZE (GET_MODE (sub)))
/* Again, invalid pointer casts (as in
compile/990203-1.c) can require paradoxical
subregs. */
|| (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
&& (GET_MODE_SIZE (GET_MODE (x))
> GET_MODE_SIZE (GET_MODE (sub)))))
{
*loc = gen_rtx_SUBREG (GET_MODE (x), sub, 0);
return true;
}
/* ??? Are there other cases we should handle? */
}
/* Sometimes we may not be able to find the replacement. For
example when the original insn was a MEM in a wider mode,
and the note is part of a sign extension of a narrowed