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From b1fc91cda7c15264116f3dde6944ead149123653 Mon Sep 17 00:00:00 2001
From: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 15 Jan 2018 11:28:44 +0000
Subject: [PATCH 02/13] i386: Use reference of struct ix86_frame to avoid copy
When there is no need to make a copy of ix86_frame, we can use reference
of struct ix86_frame to avoid copy.
Backport from mainline
2017-11-06 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386.c (ix86_can_use_return_insn_p): Use reference
of struct ix86_frame.
(ix86_initial_elimination_offset): Likewise.
(ix86_expand_split_stack_prologue): Likewise.
---
gcc/config/i386/i386.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index a1ff32b648b..13ebf107e90 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -10887,7 +10887,6 @@ symbolic_reference_mentioned_p (rtx op)
bool
ix86_can_use_return_insn_p (void)
{
- struct ix86_frame frame;
if (! reload_completed || frame_pointer_needed)
return 0;
@@ -10898,7 +10897,7 @@ ix86_can_use_return_insn_p (void)
return 0;
ix86_compute_frame_layout ();
- frame = cfun->machine->frame;
+ struct ix86_frame &frame = cfun->machine->frame;
return (frame.stack_pointer_offset == UNITS_PER_WORD
&& (frame.nregs + frame.nsseregs) == 0);
}
@@ -11310,7 +11309,7 @@ HOST_WIDE_INT
ix86_initial_elimination_offset (int from, int to)
{
ix86_compute_frame_layout ();
- struct ix86_frame frame = cfun->machine->frame;
+ struct ix86_frame &frame = cfun->machine->frame;
if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)
return frame.hard_frame_pointer_offset;
@@ -13821,7 +13820,6 @@ static GTY(()) rtx split_stack_fn_large;
void
ix86_expand_split_stack_prologue (void)
{
- struct ix86_frame frame;
HOST_WIDE_INT allocate;
unsigned HOST_WIDE_INT args_size;
rtx_code_label *label;
@@ -13834,7 +13832,7 @@ ix86_expand_split_stack_prologue (void)
ix86_finalize_stack_realign_flags ();
ix86_compute_frame_layout ();
- frame = cfun->machine->frame;
+ struct ix86_frame &frame = cfun->machine->frame;
allocate = frame.stack_pointer_offset - INCOMING_FRAME_SP_OFFSET;
/* This is the label we will branch to if we have enough stack
--
2.16.3
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