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(make_memloc): Don't reuse a memloc.

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From-SVN: r4675
This commit is contained in:
Richard Stallman 1993-06-14 08:47:36 +00:00
parent 2937cf8796
commit dbf85761b5
1 changed files with 10 additions and 0 deletions
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10
gcc/reload.c
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@ -3794,6 +3794,9 @@ find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest)
return x; return x;
} }
/* Return a mem ref for the memory equivalent of reg REGNO.
This mem ref is not shared with anything. */
static rtx static rtx
make_memloc (ad, regno) make_memloc (ad, regno)
rtx ad; rtx ad;
@ -3801,9 +3804,16 @@ make_memloc (ad, regno)
{ {
register int i; register int i;
rtx tem = reg_equiv_address[regno]; rtx tem = reg_equiv_address[regno];
#if 0 /* We cannot safely reuse a memloc made here;
if the pseudo appears twice, and its mem needs a reload,
it gets two separate reloads assigned, but it only
gets substituted with the second of them;
then it can get used before that reload reg gets loaded up. */
for (i = 0; i < n_memlocs; i++) for (i = 0; i < n_memlocs; i++)
if (rtx_equal_p (tem, XEXP (memlocs[i], 0))) if (rtx_equal_p (tem, XEXP (memlocs[i], 0)))
return memlocs[i]; return memlocs[i];
#endif
/* If TEM might contain a pseudo, we must copy it to avoid /* If TEM might contain a pseudo, we must copy it to avoid
modifying it when we do the substitution for the reload. */ modifying it when we do the substitution for the reload. */