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reload1.c (emit_reload_insns): Clear spill_reg_store when doing a new non-inherited reload from the same pseudo. 

* reload1.c (emit_reload_insns): Clear spill_reg_store
        when doing a new non-inherited reload from the same pseudo.

From-SVN: r24029
This commit is contained in:
J"orn Rennecke 1998-12-01 10:53:54 +00:00 committed by Jeff Law
parent de80f41622
commit 78a2bc0856
2 changed files with 31 additions and 0 deletions
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gcc/ChangeLog
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@ -9,6 +9,9 @@ Tue Dec 1 10:22:18 1998 Nick Clifton <nickc@cygnus.com>
Tue Dec 1 17:58:26 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload1.c (emit_reload_insns): Clear spill_reg_store
when doing a new non-inherited reload from the same pseudo.
* local-alloc.c (function_invariant_p): New function.
(update_equiv_regs): Use function_invariant_p instead of CONSTANT_P
to decide if an equivalence should be recorded.

28
gcc/reload1.c
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@ -7300,6 +7300,34 @@ emit_reload_insns (chain)
register int r = reload_order[j];
register int i = reload_spill_index[r];
/* If this is a non-inherited input reload from a pseudo, we must
clear any memory of a previous store to the same pseudo. Only do
something if there will not be an output reload for the pseudo
being reloaded. */
if (reload_in_reg[r] != 0
&& ! (reload_inherited[r] || reload_override_in[r]))
{
rtx reg = reload_in_reg[r];
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
if (GET_CODE (reg) == REG
&& REGNO (reg) >= FIRST_PSEUDO_REGISTER
&& ! reg_has_output_reload[REGNO (reg)])
{
int nregno = REGNO (reg);
if (reg_last_reload_reg[nregno])
{
int last_regno = REGNO (reg_last_reload_reg[nregno]);
if (reg_reloaded_contents[last_regno] == nregno)
spill_reg_store[last_regno] = 0;
}
}
}
/* I is nonneg if this reload used a register.
If reload_reg_rtx[r] is 0, this is an optional reload
that we opted to ignore. */