From 941c785324d7d271393c8ff3f834acc2e42d3aca Mon Sep 17 00:00:00 2001 From: uros Date: Sat, 22 Mar 2008 19:34:09 +0000 Subject: [PATCH] * config/i386/i386.c (assign_386_stack_local): Align DImode slots to their natural alignment to avoid store forwarding stalls. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@133451 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 5 +++++ gcc/config/i386/i386.c | 11 ++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5927c951c47..d1d0a18e6ee 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2008-03-22 Uros Bizjak + + * 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 PR target/27946 diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 8ddfa9f183b..60c000c6335 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -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; -- 2.11.0