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reload1.c (emit_reload_insns): Also find equivalent mems for subregs of pseudos.

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* reload1.c (emit_reload_insns): Also find equivalent mems
        for subregs of pseudos.

From-SVN: r26444
This commit is contained in:
Richard Henderson 1999-04-14 03:00:12 -07:00 committed by Richard Henderson
parent c5fb6d4a79
commit 4eea167258
2 changed files with 33 additions and 15 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Apr 14 09:59:38 1999 Richard Henderson <rth@cygnus.com>
* reload1.c (emit_reload_insns): Also find equivalent mems
for subregs of pseudos.
Wed Apr 14 09:39:20 1999 Richard Henderson <rth@cygnus.com>
* i386.md (neghi): Use the whole register when widening the op.

43
gcc/reload1.c
View File

@ -6865,6 +6865,7 @@ emit_reload_insns (chain)
int secondary_reload = reload_secondary_in_reload[j];
rtx real_oldequiv = oldequiv;
rtx real_old = old;
rtx tmp;
/* If OLDEQUIV is a pseudo with a MEM, get the real MEM
and similarly for OLD.
@ -6873,30 +6874,42 @@ emit_reload_insns (chain)
equivalent MEM, we must fall back to reload_in, which
will have all the necessary substitutions registered.
Likewise for a pseudo that can't be replaced with its
equivalent constant. */
equivalent constant.
Take extra care for subregs of such pseudos. Note that
we cannot use reg_equiv_mem in this case because it is
not in the right mode. */
if (GET_CODE (oldequiv) == REG
&& REGNO (oldequiv) >= FIRST_PSEUDO_REGISTER
&& (reg_equiv_memory_loc[REGNO (oldequiv)] != 0
|| reg_equiv_constant[REGNO (oldequiv)] != 0))
tmp = oldequiv;
if (GET_CODE (tmp) == SUBREG)
tmp = SUBREG_REG (tmp);
if (GET_CODE (tmp) == REG
&& REGNO (tmp) >= FIRST_PSEUDO_REGISTER
&& (reg_equiv_memory_loc[REGNO (tmp)] != 0
|| reg_equiv_constant[REGNO (tmp)] != 0))
{
if (! reg_equiv_mem[REGNO (oldequiv)]
|| num_not_at_initial_offset)
if (! reg_equiv_mem[REGNO (tmp)]
|| num_not_at_initial_offset
|| GET_CODE (oldequiv) == SUBREG)
real_oldequiv = reload_in[j];
else
real_oldequiv = reg_equiv_mem[REGNO (oldequiv)];
real_oldequiv = reg_equiv_mem[REGNO (tmp)];
}
if (GET_CODE (old) == REG
&& REGNO (old) >= FIRST_PSEUDO_REGISTER
&& (reg_equiv_memory_loc[REGNO (old)] != 0
|| reg_equiv_constant[REGNO (old)] != 0))
tmp = old;
if (GET_CODE (tmp) == SUBREG)
tmp = SUBREG_REG (tmp);
if (GET_CODE (tmp) == REG
&& REGNO (tmp) >= FIRST_PSEUDO_REGISTER
&& (reg_equiv_memory_loc[REGNO (tmp)] != 0
|| reg_equiv_constant[REGNO (tmp)] != 0))
{
if (! reg_equiv_mem[REGNO (old)]
|| num_not_at_initial_offset)
if (! reg_equiv_mem[REGNO (tmp)]
|| num_not_at_initial_offset
|| GET_CODE (old) == SUBREG)
real_old = reload_in[j];
else
real_old = reg_equiv_mem[REGNO (old)];
real_old = reg_equiv_mem[REGNO (tmp)];
}
second_reload_reg = reload_reg_rtx[secondary_reload];