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function.c (purge_addressof_1): If the note accesses a mem+addressof in a wider mode than any replacement...

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* function.c (purge_addressof_1): If the note accesses a mem+addressof
        in a wider mode than any replacement, adjust the cached replacement.
        Cache trivial substitutions as well.

From-SVN: r24629
This commit is contained in:
Richard Henderson 1999-01-11 16:24:25 -08:00 committed by Richard Henderson
parent 5f6c11d6e5
commit fbdfe39cf2
2 changed files with 45 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Tue Jan 12 00:23:31 1999 Richard Henderson <rth@cygnus.com>
* function.c (purge_addressof_1): If the note accesses a mem+addressof
in a wider mode than any replacement, adjust the cached replacement.
Cache trivial substitutions as well.
Tue Jan 12 00:06:00 1999 Richard Henderson <rth@cygnus.com>
* Makefile.in (OBJECTS): Add sbitmap.o.

45
gcc/function.c
View File

@ -2899,11 +2899,36 @@ purge_addressof_1 (loc, insn, force, store)
for (tem = purge_addressof_replacements; tem != NULL_RTX;
tem = XEXP (XEXP (tem, 1), 1))
if (rtx_equal_p (x, XEXP (tem, 0)))
{
*loc = XEXP (XEXP (tem, 1), 0);
return;
}
{
rtx y = XEXP (tem, 0);
if (GET_CODE (y) == MEM
&& rtx_equal_p (XEXP (x, 0), XEXP (y, 0)))
{
/* It can happen that the note may speak of things in
a wider (or just different) mode than the code did.
This is especially true of REG_RETVAL. */
rtx z = XEXP (XEXP (tem, 1), 0);
if (GET_MODE (x) != GET_MODE (y))
{
if (GET_CODE (z) == SUBREG && SUBREG_WORD (z) == 0)
z = SUBREG_REG (z);
/* ??? If we'd gotten into any of the really complex
cases below, I'm not sure we can do a proper
replacement. Might we be able to delete the
note in some cases? */
if (GET_MODE_SIZE (GET_MODE (x))
< GET_MODE_SIZE (GET_MODE (y)))
abort ();
z = gen_lowpart (GET_MODE (x), z);
}
*loc = z;
return;
}
}
/* There should always be such a replacement. */
abort ();
@ -2991,7 +3016,15 @@ purge_addressof_1 (loc, insn, force, store)
}
}
else if (validate_change (insn, loc, sub, 0))
goto restart;
{
/* Remember the replacement so that the same one can be done
on the REG_NOTES. */
purge_addressof_replacements
= gen_rtx_EXPR_LIST (VOIDmode, x,
gen_rtx_EXPR_LIST (VOIDmode, sub,
purge_addressof_replacements));
goto restart;
}
give_up:;
/* else give up and put it into the stack */
}