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i386.c (assign_386_stack_local): Align DImode slots to their natural alignment to avoid store forwarding stalls.

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* config/i386/i386.c (assign_386_stack_local): Align DImode slots
        to their natural alignment to avoid store forwarding stalls.

From-SVN: r133451
This commit is contained in:
Uros Bizjak 2008-03-22 20:34:09 +01:00 committed by Uros Bizjak
parent a6b2268416
commit 48e55066d5
2 changed files with 15 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2008-03-22 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.c (assign_386_stack_local): Align DImode slots
to their natural alignment to avoid store forwarding stalls.
2008-03-21 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR target/27946

11
gcc/config/i386/i386.c
View File

@ -16315,6 +16315,7 @@ rtx
assign_386_stack_local (enum machine_mode mode, enum ix86_stack_slot n)
{
struct stack_local_entry *s;
int align;
gcc_assert (n < MAX_386_STACK_LOCALS);
@ -16325,11 +16326,19 @@ assign_386_stack_local (enum machine_mode mode, enum ix86_stack_slot n)
if (s->mode == mode && s->n == n)
return copy_rtx (s->rtl);
/* Align DImode slots to their natural alignment
to avoid store forwarding stalls. */
if (mode == DImode
&& (GET_MODE_BITSIZE (mode) > GET_MODE_ALIGNMENT (mode)))
align = GET_MODE_BITSIZE (mode);
else
align = 0;
s = (struct stack_local_entry *)
ggc_alloc (sizeof (struct stack_local_entry));
s->n = n;
s->mode = mode;
s->rtl = assign_stack_local (mode, GET_MODE_SIZE (mode), 0);
s->rtl = assign_stack_local (mode, GET_MODE_SIZE (mode), align);
s->next = ix86_stack_locals;
ix86_stack_locals = s;