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Bugfix in order_regs_for_reload 

From-SVN: r29455
This commit is contained in:
Bernd Schmidt 1999-09-16 09:55:48 +00:00 committed by Bernd Schmidt
parent 7402eca07a
commit 2feb9704c2
2 changed files with 22 additions and 26 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Sep 16 10:53:36 1999 Bernd Schmidt <bernds@cygnus.co.uk>
* reload1.c (order_regs_for_reload): Move hard_reg_n_uses
computation out of loop over hard regs.
Wed Sep 15 21:37:06 1999 Mark Mitchell <mark@codesourcery.com>
* function.c (identify_blocks): Don't shadow a variable in an

43
gcc/reload1.c
View File

@ -4109,45 +4109,36 @@ order_regs_for_reload (chain)
COPY_HARD_REG_SET (bad_spill_regs, bad_spill_regs_global);
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
hard_reg_n_uses[i].regno = i;
hard_reg_n_uses[i].uses = 0;
}
/* Count number of uses of each hard reg by pseudo regs allocated to it
and then order them by decreasing use. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
int j;
hard_reg_n_uses[i].regno = i;
hard_reg_n_uses[i].uses = 0;
/* Test the various reasons why we can't use a register for
spilling in this insn. */
if (fixed_regs[i]
|| REGNO_REG_SET_P (chain->live_before, i)
|| REGNO_REG_SET_P (chain->live_after, i))
{
SET_HARD_REG_BIT (bad_spill_regs, i);
continue;
}
/* Now find out which pseudos are allocated to it, and update
hard_reg_n_uses. */
CLEAR_REG_SET (pseudos_counted);
EXECUTE_IF_SET_IN_REG_SET
(chain->live_before, FIRST_PSEUDO_REGISTER, j,
{
count_pseudo (hard_reg_n_uses, j);
});
EXECUTE_IF_SET_IN_REG_SET
(chain->live_after, FIRST_PSEUDO_REGISTER, j,
{
count_pseudo (hard_reg_n_uses, j);
});
SET_HARD_REG_BIT (bad_spill_regs, i);
}
/* Now compute hard_reg_n_uses. */
CLEAR_REG_SET (pseudos_counted);
EXECUTE_IF_SET_IN_REG_SET
(chain->live_before, FIRST_PSEUDO_REGISTER, i,
{
count_pseudo (hard_reg_n_uses, i);
});
EXECUTE_IF_SET_IN_REG_SET
(chain->live_after, FIRST_PSEUDO_REGISTER, i,
{
count_pseudo (hard_reg_n_uses, i);
});
FREE_REG_SET (pseudos_counted);
/* Prefer registers not so far used, for use in temporary loading.