Add two new frame fields:
* cfun->machine->frame.wb_candidate1
* cfun->machine->frame.wb_candidate2
* wb_candidate1 to record the first reg index which
could carry write-back.
* wb_candidate2 to record the second reg index which
could form reg pair with
* wb_candidate1 to carry write-back when doing paired
load/store.
They are useful in later pro/epi optimization.
*no functional change*
ok to install?
thanks.
gcc/
* config/aarch64/aarch64.h (frame): New fields "wb_candidate1" and
"wb_candidate2".
* config/aarch64/aarch64.c (aarch64_layout_frame): Calcualte new added fields.
>From 1272a5bcbb7978452cef1d0da507500c459031c5 Mon Sep 17 00:00:00 2001
From: Jiong Wang <jiong.w...@arm.com>
Date: Tue, 17 Jun 2014 22:21:44 +0100
Subject: [PATCH 15/19] [AArch64/GCC][16/20] Add two new frame fields
Add two new frame fields:
* cfun->machine->frame.wb_candidate1
* cfun->machine->frame.wb_candidate2
wb_candidate1 to record the first reg index which could carry write-back.
wb_candidate2 to record the second reg index which could form reg pair with
wb_candidate1 to carry write-back when doing paired load/store.
They are useful in later pro/epi optimization.
*no functional change*
2014-06-16 Jiong Wang <jiong.w...@arm.com>
Marcus Shawcroft <marcus.shawcr...@arm.com>
gcc/
* config/aarch64/aarch64.h (frame): New fields "wb_candidate1" and
"wb_candidate2".
* config/aarch64/aarch64.c (aarch64_layout_frame): Calcualte new added fields.
---
gcc/config/aarch64/aarch64.c | 14 ++++++++++++++
gcc/config/aarch64/aarch64.h | 3 +++
2 files changed, 17 insertions(+)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 65a84e8..a6b253a 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1815,6 +1815,9 @@ aarch64_layout_frame (void)
#define SLOT_NOT_REQUIRED (-2)
#define SLOT_REQUIRED (-1)
+ cfun->machine->frame.wb_candidate1 = FIRST_PSEUDO_REGISTER;
+ cfun->machine->frame.wb_candidate2 = FIRST_PSEUDO_REGISTER;
+
/* First mark all the registers that really need to be saved... */
for (regno = R0_REGNUM; regno <= R30_REGNUM; regno++)
cfun->machine->frame.reg_offset[regno] = SLOT_NOT_REQUIRED;
@@ -1843,7 +1846,9 @@ aarch64_layout_frame (void)
{
/* FP and LR are placed in the linkage record. */
cfun->machine->frame.reg_offset[R29_REGNUM] = 0;
+ cfun->machine->frame.wb_candidate1 = R29_REGNUM;
cfun->machine->frame.reg_offset[R30_REGNUM] = UNITS_PER_WORD;
+ cfun->machine->frame.wb_candidate2 = R30_REGNUM;
cfun->machine->frame.hardfp_offset = 2 * UNITS_PER_WORD;
offset += 2 * UNITS_PER_WORD;
}
@@ -1853,6 +1858,10 @@ aarch64_layout_frame (void)
if (cfun->machine->frame.reg_offset[regno] == SLOT_REQUIRED)
{
cfun->machine->frame.reg_offset[regno] = offset;
+ if (cfun->machine->frame.wb_candidate1 == FIRST_PSEUDO_REGISTER)
+ cfun->machine->frame.wb_candidate1 = regno;
+ else if (cfun->machine->frame.wb_candidate2 == FIRST_PSEUDO_REGISTER)
+ cfun->machine->frame.wb_candidate2 = regno;
offset += UNITS_PER_WORD;
}
@@ -1860,6 +1869,11 @@ aarch64_layout_frame (void)
if (cfun->machine->frame.reg_offset[regno] == SLOT_REQUIRED)
{
cfun->machine->frame.reg_offset[regno] = offset;
+ if (cfun->machine->frame.wb_candidate1 == FIRST_PSEUDO_REGISTER)
+ cfun->machine->frame.wb_candidate1 = regno;
+ else if (cfun->machine->frame.wb_candidate2 == FIRST_PSEUDO_REGISTER
+ && cfun->machine->frame.wb_candidate1 >= V0_REGNUM)
+ cfun->machine->frame.wb_candidate2 = regno;
offset += UNITS_PER_WORD;
}
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index b95365a..ee70a18 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -542,6 +542,9 @@ struct GTY (()) aarch64_frame
* frame (incomming SP) to the stack_pointer. This value is always
* a multiple of STACK_BOUNDARY. */
+ unsigned wb_candidate1;
+ unsigned wb_candidate2;
+
HOST_WIDE_INT frame_size;
bool laid_out;
--
1.7.9.5
