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Remove no_caller_save_reg_set

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Reusing the reasoning from the call_fixed_reg_set patch:

  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    for (j = 1; j <= MOVE_MAX_WORDS; j++)
      if (reg_save_code (i,regno_save_mode[i][j]) == -1)

should be true whenever regno_save_mode[i][j] == VOIDmode,
which it is for:

  ~call_used_reg_set | ~have_save_mode

So this condition amounts to:

  ~call_used_reg_set | ~have_save_mode | ~have_save_insn
  == ~call_used_reg_set | ~savable_regs

no_caller_save_reg_set is then set if call_used_regs[i], so
no_caller_save_reg_set is:

  call_used_reg_set & (~call_used_reg_set | ~savable_regs)
  == call_used_reg_set & ~savable_regs

This patch expands its single user accordingly.

Note that ~savable_regs is always empty on LRA targets.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (target_hard_regs::x_no_caller_save_reg_set): Delete.
	(no_caller_save_reg_set): Delete.
	* caller-save.c (init_caller_save): Don't initialize it.
	* ira-conflicts.c (ira_build_conflicts): Calculate
	no_caller_save_reg_set locally from call_used_reg_set and savable_regs.

From-SVN: r275599
This commit is contained in:
Richard Sandiford 2019-09-10 18:56:31 +00:00 committed by Richard Sandiford
parent df1f0eef67
commit 026116ce2a
4 changed files with 11 additions and 12 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2019-09-10 Richard Sandiford <richard.sandiford@arm.com>
* hard-reg-set.h (target_hard_regs::x_no_caller_save_reg_set): Delete.
(no_caller_save_reg_set): Delete.
* caller-save.c (init_caller_save): Don't initialize it.
* ira-conflicts.c (ira_build_conflicts): Calculate
no_caller_save_reg_set locally from call_used_reg_set and savable_regs.
2019-09-10 Richard Sandiford <richard.sandiford@arm.com>
* hard-reg-set.h (target_hard_regs::x_call_fixed_reg_set): Delete.

7
gcc/caller-save.c
View File

@ -192,7 +192,6 @@ init_caller_save (void)
caller_save_initialized_p = true;
CLEAR_HARD_REG_SET (no_caller_save_reg_set);
/* First find all the registers that we need to deal with and all
the modes that they can have. If we can't find a mode to use,
we can't have the register live over calls. */
@ -264,11 +263,7 @@ init_caller_save (void)
{
regno_save_mode[i][j] = VOIDmode;
if (j == 1)
{
CLEAR_HARD_REG_BIT (savable_regs, i);
if (call_used_regs[i])
SET_HARD_REG_BIT (no_caller_save_reg_set, i);
}
CLEAR_HARD_REG_BIT (savable_regs, i);
}
}

6
gcc/hard-reg-set.h
View File

@ -424,10 +424,6 @@ struct target_hard_regs {
with the local stack frame are safe, but scant others. */
HARD_REG_SET x_regs_invalidated_by_call;
/* Call used hard registers which cannot be saved because there is no
insn for this. */
HARD_REG_SET x_no_caller_save_reg_set;
/* Table of register numbers in the order in which to try to use them. */
int x_reg_alloc_order[FIRST_PSEUDO_REGISTER];
@ -490,8 +486,6 @@ extern struct target_hard_regs *this_target_hard_regs;
(this_target_hard_regs->x_savable_regs)
#define regs_invalidated_by_call \
(this_target_hard_regs->x_regs_invalidated_by_call)
#define no_caller_save_reg_set \
(this_target_hard_regs->x_no_caller_save_reg_set)
#define reg_alloc_order \
(this_target_hard_regs->x_reg_alloc_order)
#define inv_reg_alloc_order \

2
gcc/ira-conflicts.c
View File

@ -765,6 +765,8 @@ ira_build_conflicts (void)
}
else if (ALLOCNO_CALLS_CROSSED_NUM (a) != 0)
{
HARD_REG_SET no_caller_save_reg_set
= (call_used_reg_set & ~savable_regs);
OBJECT_TOTAL_CONFLICT_HARD_REGS (obj) |= no_caller_save_reg_set;
OBJECT_TOTAL_CONFLICT_HARD_REGS (obj) |= temp_hard_reg_set;
OBJECT_CONFLICT_HARD_REGS (obj) |= no_caller_save_reg_set;