OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[ARC] Restore blink first when optimizing for speed.

Browse Source 
When not optimizing for size, we can restore first blink, hence the return
instruction will be executed faster.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (GMASK_LEN): Define.
	(arc_restore_callee_saves): Restore first blink when
	!optimize_size.

From-SVN: r270120
This commit is contained in:
Claudiu Zissulescu 2019-04-03 12:08:04 +02:00 committed by Claudiu Zissulescu
parent deb012a19d
commit 8f84521301
2 changed files with 41 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2019-04-03 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.c (GMASK_LEN): Define.
(arc_restore_callee_saves): Restore first blink when
!optimize_size.
2019-04-03 Sudakshina Das <sudi.das@arm.com>
* doc/extend.texi: Add deprecated comment on sign-return-address

37
gcc/config/arc/arc.c
View File

@ -2506,6 +2506,9 @@ struct GTY (()) arc_frame_info
bool save_return_addr;
};
/* GMASK bit length -1. */
#define GMASK_LEN 31
/* Defining data structures for per-function information. */
typedef struct GTY (()) machine_function
@ -3048,6 +3051,8 @@ arc_restore_callee_saves (unsigned int gmask,
{
rtx reg;
int frame_deallocated = 0;
HOST_WIDE_INT offs = cfun->machine->frame_info.reg_size;
bool early_blink_restore;
/* Emit mov fp,sp. */
if (arc_frame_pointer_needed () && offset)
@ -3073,9 +3078,21 @@ arc_restore_callee_saves (unsigned int gmask,
offset = 0;
}
/* When we do not optimize for size, restore first blink. */
early_blink_restore = restore_blink && !optimize_size && offs;
if (early_blink_restore)
{
rtx addr = plus_constant (Pmode, stack_pointer_rtx, offs);
reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
rtx insn = frame_move_inc (reg, gen_frame_mem (Pmode, addr),
stack_pointer_rtx, NULL_RTX);
add_reg_note (insn, REG_CFA_RESTORE, reg);
restore_blink = false;
}
/* N.B. FRAME_POINTER_MASK and RETURN_ADDR_MASK are cleared in gmask. */
if (gmask)
for (int i = 0; i <= 31; i++)
for (int i = 0; i <= GMASK_LEN; i++)
{
machine_mode restore_mode = SImode;
@ -3088,7 +3105,23 @@ arc_restore_callee_saves (unsigned int gmask,
continue;
reg = gen_rtx_REG (restore_mode, i);
frame_deallocated += frame_restore_reg (reg, 0);
offs = 0;
switch (restore_mode)
{
case E_DImode:
if ((GMASK_LEN - __builtin_clz (gmask)) == (i + 1)
&& early_blink_restore)
offs = 4;
break;
case E_SImode:
if ((GMASK_LEN - __builtin_clz (gmask)) == i
&& early_blink_restore)
offs = 4;
break;
default:
offs = 0;
}
frame_deallocated += frame_restore_reg (reg, offs);
offset = 0;
if (restore_mode == DImode)