From 18202ba32cb8de22fc43a5839235a751d0f5c4d9 Mon Sep 17 00:00:00 2001 From: hjl Date: Mon, 15 Jan 2018 11:28:44 +0000 Subject: [PATCH 2/9] 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 * 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-7-branch@256692 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/config/i386/i386.c | 9 +++------ gcc/testsuite/ChangeLog | 8 ++++++++ 2 files changed, 11 insertions(+), 6 deletions(-) diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 8133372..397ef7c 100644 --- a/src/gcc/config/i386/i386.c +++ b/src/gcc/config/i386/i386.c @@ -11843,8 +11843,6 @@ 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; @@ -11857,7 +11855,7 @@ 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); } @@ -12344,7 +12342,7 @@ 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; @@ -14860,7 +14858,6 @@ 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; @@ -14873,7 +14870,7 @@ 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 -- 2.7.4