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[AArch64] Optimize prologue when there is no frame pointer. 

From-SVN: r212999
This commit is contained in:
Jiong Wang 2014-07-24 14:41:49 +00:00 committed by Marcus Shawcroft
parent ae13fce333
commit c5e1f66e59
11 changed files with 91 additions and 22 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-07-24 Jiong Wang <jiong.wang@arm.com>
* config/aarch64/aarch64.c (aarch64_pushwb_single_reg): New function.
(aarch64_expand_prologue): Optimize prologue when !frame_pointer_needed.
2014-07-24 Jiong Wang <jiong.wang@arm.com>
* config/aarch64/aarch64.c (aarch64_restore_callee_saves)

58
gcc/config/aarch64/aarch64.c
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@ -1930,6 +1930,22 @@ aarch64_next_callee_save (unsigned regno, unsigned limit)
return regno;
}
static void
aarch64_pushwb_single_reg (enum machine_mode mode, unsigned regno,
HOST_WIDE_INT adjustment)
{
rtx base_rtx = stack_pointer_rtx;
rtx insn, reg, mem;
reg = gen_rtx_REG (mode, regno);
mem = gen_rtx_PRE_MODIFY (Pmode, base_rtx,
plus_constant (Pmode, base_rtx, -adjustment));
mem = gen_rtx_MEM (mode, mem);
insn = emit_move_insn (mem, reg);
RTX_FRAME_RELATED_P (insn) = 1;
}
static rtx
aarch64_gen_storewb_pair (enum machine_mode mode, rtx base, rtx reg, rtx reg2,
HOST_WIDE_INT adjustment)
@ -2279,11 +2295,10 @@ aarch64_expand_prologue (void)
{
bool skip_wb = false;
/* Save the frame pointer and lr if the frame pointer is needed
first. Make the frame pointer point to the location of the
old frame pointer on the stack. */
if (frame_pointer_needed)
{
skip_wb = true;
if (fp_offset)
{
insn = emit_insn (gen_add2_insn (stack_pointer_rtx,
@ -2291,12 +2306,11 @@ aarch64_expand_prologue (void)
RTX_FRAME_RELATED_P (insn) = 1;
aarch64_set_frame_expr (gen_rtx_SET
(Pmode, stack_pointer_rtx,
gen_rtx_MINUS (Pmode,
stack_pointer_rtx,
gen_rtx_MINUS (Pmode, stack_pointer_rtx,
GEN_INT (offset))));
aarch64_save_callee_saves (DImode, fp_offset, R29_REGNUM,
R30_REGNUM, skip_wb);
R30_REGNUM, false);
}
else
aarch64_pushwb_pair_reg (DImode, R29_REGNUM, R30_REGNUM, offset);
@ -2314,20 +2328,36 @@ aarch64_expand_prologue (void)
RTX_FRAME_RELATED_P (insn) = 1;
insn = emit_insn (gen_stack_tie (stack_pointer_rtx,
hard_frame_pointer_rtx));
aarch64_save_callee_saves (DImode, fp_offset, R0_REGNUM, R28_REGNUM,
skip_wb);
}
else
{
insn = emit_insn (gen_add2_insn (stack_pointer_rtx,
GEN_INT (-offset)));
RTX_FRAME_RELATED_P (insn) = 1;
unsigned reg1 = cfun->machine->frame.wb_candidate1;
unsigned reg2 = cfun->machine->frame.wb_candidate2;
aarch64_save_callee_saves (DImode, fp_offset, R0_REGNUM, R30_REGNUM,
skip_wb);
if (fp_offset
|| reg1 == FIRST_PSEUDO_REGISTER
|| (reg2 == FIRST_PSEUDO_REGISTER
&& offset >= 256))
{
insn = emit_insn (gen_add2_insn (stack_pointer_rtx,
GEN_INT (-offset)));
RTX_FRAME_RELATED_P (insn) = 1;
}
else
{
enum machine_mode mode1 = (reg1 <= R30_REGNUM) ? DImode : DFmode;
skip_wb = true;
if (reg2 == FIRST_PSEUDO_REGISTER)
aarch64_pushwb_single_reg (mode1, reg1, offset);
else
aarch64_pushwb_pair_reg (mode1, reg1, reg2, offset);
}
}
aarch64_save_callee_saves (DImode, fp_offset, R0_REGNUM, R30_REGNUM,
skip_wb);
aarch64_save_callee_saves (DFmode, fp_offset, V0_REGNUM, V31_REGNUM,
skip_wb);
}

12
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,15 @@
2014-07-24 Jiong Wang <jiong.wang@arm.com>
* gcc.target/aarch64/test_frame_1.c: Match optimized instruction
sequences.
* gcc.target/aarch64/test_frame_10.c: Likewise.
* gcc.target/aarch64/test_frame_2.c: Likewise.
* gcc.target/aarch64/test_frame_4.c: Likewise.
* gcc.target/aarch64/test_frame_6.c: Likewise.
* gcc.target/aarch64/test_frame_7.c: Likewise.
* gcc.target/aarch64/test_frame_8.c: Likewise.
* gcc.target/aarch64/test_fp_attribute_1.c: Likewise.
2014-07-24 Martin Jambor <mjambor@suse.cz>
PR ipa/61160

2
gcc/testsuite/gcc.target/aarch64/test_fp_attribute_1.c
View File

@ -21,6 +21,6 @@ non_leaf_2 (void)
leaf ();
}
/* { dg-final { scan-assembler-times "str\tx30, \\\[sp\\\]" 2 } } */
/* { dg-final { scan-assembler-times "str\tx30, \\\[sp, -\[0-9\]+\\\]!" 2 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_1.c
View File

@ -6,9 +6,12 @@
* optimized code should use "str !" for stack adjustment. */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern (test1, 200, )
t_frame_run (test1)
/* { dg-final { scan-assembler-times "str\tx30, \\\[sp, -\[0-9\]+\\\]!" 2 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_10.c
View File

@ -8,9 +8,12 @@
the first subtractions could be optimized into "stp !". */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern_outgoing (test10, 480, "x19", 24, a[8], a[9], a[10])
t_frame_run (test10)
/* { dg-final { scan-assembler-times "stp\tx19, x30, \\\[sp, -\[0-9\]+\\\]!" 1 } } */
/* { dg-final { cleanup-saved-temps } } */

6
gcc/testsuite/gcc.target/aarch64/test_frame_2.c
View File

@ -6,9 +6,13 @@
* optimized code should use "stp !" for stack adjustment. */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern (test2, 200, "x19")
t_frame_run (test2)
/* { dg-final { scan-assembler-times "stp\tx19, x30, \\\[sp, -\[0-9\]+\\\]!" 1 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_4.c
View File

@ -6,9 +6,12 @@
* we can use "stp !" to optimize stack adjustment. */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern (test4, 400, "x19")
t_frame_run (test4)
/* { dg-final { scan-assembler-times "stp\tx19, x30, \\\[sp, -\[0-9\]+\\\]!" 1 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_6.c
View File

@ -7,9 +7,12 @@
the second subtraction should use "str !". */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern (test6, 700, )
t_frame_run (test6)
/* { dg-final { scan-assembler-times "str\tx30, \\\[sp, -\[0-9\]+\\\]!" 2 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_7.c
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@ -7,9 +7,12 @@
the second subtraction should use "stp !". */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern (test7, 700, "x19")
t_frame_run (test7)
/* { dg-final { scan-assembler-times "stp\tx19, x30, \\\[sp, -\[0-9\]+\\\]!" 1 } } */
/* { dg-final { cleanup-saved-temps } } */

5
gcc/testsuite/gcc.target/aarch64/test_frame_8.c
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@ -5,9 +5,12 @@
* number of callee-saved reg == 1. */
/* { dg-do run } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
/* { dg-options "-O2 -fomit-frame-pointer --save-temps" } */
#include "test_frame_common.h"
t_frame_pattern_outgoing (test8, 700, , 8, a[8])
t_frame_run (test8)
/* { dg-final { scan-assembler-times "str\tx30, \\\[sp, -\[0-9\]+\\\]!" 3 } } */
/* { dg-final { cleanup-saved-temps } } */