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reload1.c (alter_reg): Require the alignment of the stack slot to be at least reg_max_ref_width bytes. 

gcc/
	* reload1.c (alter_reg): Require the alignment of the stack slot to
	be at least reg_max_ref_width bytes.
	(scan_paradoxical_subregs): Record the largest width in
	reg_max_ref_width.

From-SVN: r117252
This commit is contained in:
Richard Sandiford 2006-09-27 15:27:38 +00:00 committed by Richard Sandiford
parent 0d1187867f
commit 63a7a62b25
2 changed files with 21 additions and 6 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2006-09-27 Richard Sandiford <richard@codesourcery.com>
* reload1.c (alter_reg): Require the alignment of the stack slot to
be at least reg_max_ref_width bytes.
(scan_paradoxical_subregs): Record the largest width in
reg_max_ref_width.
2006-09-26 Jakub Jelinek <jakub@redhat.com>
PR middle-end/25261

20
gcc/reload1.c
View File

@ -1996,8 +1996,11 @@ alter_reg (int i, int from_reg)
&& reg_equiv_memory_loc[i] == 0)
{
rtx x;
enum machine_mode mode = GET_MODE (regno_reg_rtx[i]);
unsigned int inherent_size = PSEUDO_REGNO_BYTES (i);
unsigned int inherent_align = GET_MODE_ALIGNMENT (mode);
unsigned int total_size = MAX (inherent_size, reg_max_ref_width[i]);
unsigned int min_align = reg_max_ref_width[i] * BITS_PER_UNIT;
int adjust = 0;
/* Each pseudo reg has an inherent size which comes from its own mode,
@ -2011,8 +2014,9 @@ alter_reg (int i, int from_reg)
if (from_reg == -1)
{
/* No known place to spill from => no slot to reuse. */
x = assign_stack_local (GET_MODE (regno_reg_rtx[i]), total_size,
inherent_size == total_size ? 0 : -1);
x = assign_stack_local (mode, total_size,
min_align > inherent_align
|| total_size > inherent_size ? -1 : 0);
if (BYTES_BIG_ENDIAN)
/* Cancel the big-endian correction done in assign_stack_local.
Get the address of the beginning of the slot.
@ -2028,7 +2032,8 @@ alter_reg (int i, int from_reg)
else if (spill_stack_slot[from_reg] != 0
&& spill_stack_slot_width[from_reg] >= total_size
&& (GET_MODE_SIZE (GET_MODE (spill_stack_slot[from_reg]))
>= inherent_size))
>= inherent_size)
&& MEM_ALIGN (spill_stack_slot[from_reg]) >= min_align)
x = spill_stack_slot[from_reg];
/* Allocate a bigger slot. */
@ -2036,7 +2041,6 @@ alter_reg (int i, int from_reg)
{
/* Compute maximum size needed, both for inherent size
and for total size. */
enum machine_mode mode = GET_MODE (regno_reg_rtx[i]);
rtx stack_slot;
if (spill_stack_slot[from_reg])
@ -2046,11 +2050,14 @@ alter_reg (int i, int from_reg)
mode = GET_MODE (spill_stack_slot[from_reg]);
if (spill_stack_slot_width[from_reg] > total_size)
total_size = spill_stack_slot_width[from_reg];
if (MEM_ALIGN (spill_stack_slot[from_reg]) > min_align)
min_align = MEM_ALIGN (spill_stack_slot[from_reg]);
}
/* Make a slot with that size. */
x = assign_stack_local (mode, total_size,
inherent_size == total_size ? 0 : -1);
min_align > inherent_align
|| total_size > inherent_size ? -1 : 0);
stack_slot = x;
/* All pseudos mapped to this slot can alias each other. */
@ -3828,7 +3835,8 @@ scan_paradoxical_subregs (rtx x)
case SUBREG:
if (REG_P (SUBREG_REG (x))
&& GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
&& (GET_MODE_SIZE (GET_MODE (x))
> reg_max_ref_width[REGNO (SUBREG_REG (x))]))
reg_max_ref_width[REGNO (SUBREG_REG (x))]
= GET_MODE_SIZE (GET_MODE (x));
return;