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reload1.c (emit_reload_insns): If an output reload copies only to a secondary reload register... 

* reload1.c (emit_reload_insns): If an output reload copies only
	to a secondary reload register, indicate that the secondary reload
	does the actual store.

From-SVN: r21034
This commit is contained in:
J"orn Rennecke 1998-07-09 10:18:53 +00:00 committed by Joern Rennecke
parent 930176e742
commit 9da4652288
2 changed files with 35 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Thu Jul 9 18:12:49 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload1.c (emit_reload_insns): If an output reload copies only
to a secondary reload register, indicate that the secondary reload
does the actual store.
Thu Jul 9 18:01:05 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload.c (find_equiv_reg): If need_stable_sp is set,

30
gcc/reload1.c
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@ -7085,7 +7085,35 @@ emit_reload_insns (insn)
SET_HARD_REG_BIT (reg_reloaded_died, src);
}
if (reload_spill_index[j] >= 0)
new_spill_reg_store[reload_spill_index[j]] = p;
{
int s = reload_secondary_out_reload[j];
rtx set = single_set (p);
/* If this reload copies only to the secondary reload
register, the secondary reload does the actual
store. */
if (s >= 0 && set == NULL_RTX)
; /* We can't tell what function the secondary reload
has and where the actual store to the pseudo is
made; leave new_spill_reg_store alone. */
else if (s >= 0
&& SET_SRC (set) == reload_reg_rtx[j]
&& SET_DEST (set) == reload_reg_rtx[s])
{
/* Usually the next instruction will be the
secondary reload insn; if we can confirm
that it is, setting new_spill_reg_store to
that insn will allow an extra optimization. */
rtx s_reg = reload_reg_rtx[s];
rtx next = NEXT_INSN (p);
reload_out[s] = reload_out[j];
set = single_set (next);
if (set && SET_SRC (set) == s_reg
&& ! new_spill_reg_store[REGNO (s_reg)])
new_spill_reg_store[REGNO (s_reg)] = next;
}
else
new_spill_reg_store[reload_spill_index[j]] = p;
}
}
}