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authorNicolas Pitre <nico@cam.org>2005-10-30 18:08:03 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-10-30 18:08:03 -0500
commitf741a1aab5fd7892927208ca37eb86b9ea85784a (patch)
treec4060ea9292f5e8f98e87ef354079bc900d81243 /arch/arm/lib
parentcb7610d018235653c73ff1fea79b962c16317474 (diff)
[ARM] 3049/1: More optimized libgcc functions
Patch from Nicolas Pitre This patch gets rid of the last C implementations of needed libgcc functions for the kernel, replacing them with optimized assembly versions. Those functions are: __ashldi3 __ashrdi3 __lshrdi3 __muldi3 __ucmpdi2 The first 3 were lifted from gcc, the other two were written from scratch. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/ashldi3.S48
-rw-r--r--arch/arm/lib/ashldi3.c56
-rw-r--r--arch/arm/lib/ashrdi3.S48
-rw-r--r--arch/arm/lib/ashrdi3.c57
-rw-r--r--arch/arm/lib/gcclib.h22
-rw-r--r--arch/arm/lib/lshrdi3.S48
-rw-r--r--arch/arm/lib/lshrdi3.c56
-rw-r--r--arch/arm/lib/muldi3.S44
-rw-r--r--arch/arm/lib/muldi3.c72
-rw-r--r--arch/arm/lib/ucmpdi2.S35
-rw-r--r--arch/arm/lib/ucmpdi2.c49
11 files changed, 223 insertions, 312 deletions
diff --git a/arch/arm/lib/ashldi3.S b/arch/arm/lib/ashldi3.S
new file mode 100644
index 000000000000..561e20717b30
--- /dev/null
+++ b/arch/arm/lib/ashldi3.S
@@ -0,0 +1,48 @@
1/* Copyright 1995, 1996, 1998, 1999, 2000, 2003, 2004, 2005
2 Free Software Foundation, Inc.
3
4This file is free software; you can redistribute it and/or modify it
5under the terms of the GNU General Public License as published by the
6Free Software Foundation; either version 2, or (at your option) any
7later version.
8
9In addition to the permissions in the GNU General Public License, the
10Free Software Foundation gives you unlimited permission to link the
11compiled version of this file into combinations with other programs,
12and to distribute those combinations without any restriction coming
13from the use of this file. (The General Public License restrictions
14do apply in other respects; for example, they cover modification of
15the file, and distribution when not linked into a combine
16executable.)
17
18This file is distributed in the hope that it will be useful, but
19WITHOUT ANY WARRANTY; without even the implied warranty of
20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21General Public License for more details.
22
23You should have received a copy of the GNU General Public License
24along with this program; see the file COPYING. If not, write to
25the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26Boston, MA 02110-1301, USA. */
27
28
29#include <linux/linkage.h>
30
31#ifdef __ARMEB__
32#define al r1
33#define ah r0
34#else
35#define al r0
36#define ah r1
37#endif
38
39ENTRY(__ashldi3)
40
41 subs r3, r2, #32
42 rsb ip, r2, #32
43 movmi ah, ah, lsl r2
44 movpl ah, al, lsl r3
45 orrmi ah, ah, al, lsr ip
46 mov al, al, lsl r2
47 mov pc, lr
48
diff --git a/arch/arm/lib/ashldi3.c b/arch/arm/lib/ashldi3.c
deleted file mode 100644
index b62875cfd8f8..000000000000
--- a/arch/arm/lib/ashldi3.c
+++ /dev/null
@@ -1,56 +0,0 @@
1/* More subroutines needed by GCC output code on some machines. */
2/* Compile this one with gcc. */
3/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22/* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton 29/07/01 */
31
32#include "gcclib.h"
33
34s64 __ashldi3(s64 u, int b)
35{
36 DIunion w;
37 int bm;
38 DIunion uu;
39
40 if (b == 0)
41 return u;
42
43 uu.ll = u;
44
45 bm = (sizeof(s32) * BITS_PER_UNIT) - b;
46 if (bm <= 0) {
47 w.s.low = 0;
48 w.s.high = (u32) uu.s.low << -bm;
49 } else {
50 u32 carries = (u32) uu.s.low >> bm;
51 w.s.low = (u32) uu.s.low << b;
52 w.s.high = ((u32) uu.s.high << b) | carries;
53 }
54
55 return w.ll;
56}
diff --git a/arch/arm/lib/ashrdi3.S b/arch/arm/lib/ashrdi3.S
new file mode 100644
index 000000000000..86fb2a90c301
--- /dev/null
+++ b/arch/arm/lib/ashrdi3.S
@@ -0,0 +1,48 @@
1/* Copyright 1995, 1996, 1998, 1999, 2000, 2003, 2004, 2005
2 Free Software Foundation, Inc.
3
4This file is free software; you can redistribute it and/or modify it
5under the terms of the GNU General Public License as published by the
6Free Software Foundation; either version 2, or (at your option) any
7later version.
8
9In addition to the permissions in the GNU General Public License, the
10Free Software Foundation gives you unlimited permission to link the
11compiled version of this file into combinations with other programs,
12and to distribute those combinations without any restriction coming
13from the use of this file. (The General Public License restrictions
14do apply in other respects; for example, they cover modification of
15the file, and distribution when not linked into a combine
16executable.)
17
18This file is distributed in the hope that it will be useful, but
19WITHOUT ANY WARRANTY; without even the implied warranty of
20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21General Public License for more details.
22
23You should have received a copy of the GNU General Public License
24along with this program; see the file COPYING. If not, write to
25the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26Boston, MA 02110-1301, USA. */
27
28
29#include <linux/linkage.h>
30
31#ifdef __ARMEB__
32#define al r1
33#define ah r0
34#else
35#define al r0
36#define ah r1
37#endif
38
39ENTRY(__ashrdi3)
40
41 subs r3, r2, #32
42 rsb ip, r2, #32
43 movmi al, al, lsr r2
44 movpl al, ah, asr r3
45 orrmi al, al, ah, lsl ip
46 mov ah, ah, asr r2
47 mov pc, lr
48
diff --git a/arch/arm/lib/ashrdi3.c b/arch/arm/lib/ashrdi3.c
deleted file mode 100644
index 9a8600a7543f..000000000000
--- a/arch/arm/lib/ashrdi3.c
+++ /dev/null
@@ -1,57 +0,0 @@
1/* More subroutines needed by GCC output code on some machines. */
2/* Compile this one with gcc. */
3/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22/* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton 29/07/01 */
31
32#include "gcclib.h"
33
34s64 __ashrdi3(s64 u, int b)
35{
36 DIunion w;
37 int bm;
38 DIunion uu;
39
40 if (b == 0)
41 return u;
42
43 uu.ll = u;
44
45 bm = (sizeof(s32) * BITS_PER_UNIT) - b;
46 if (bm <= 0) {
47 /* w.s.high = 1..1 or 0..0 */
48 w.s.high = uu.s.high >> (sizeof(s32) * BITS_PER_UNIT - 1);
49 w.s.low = uu.s.high >> -bm;
50 } else {
51 u32 carries = (u32) uu.s.high << bm;
52 w.s.high = uu.s.high >> b;
53 w.s.low = ((u32) uu.s.low >> b) | carries;
54 }
55
56 return w.ll;
57}
diff --git a/arch/arm/lib/gcclib.h b/arch/arm/lib/gcclib.h
deleted file mode 100644
index 8b6dcc656de7..000000000000
--- a/arch/arm/lib/gcclib.h
+++ /dev/null
@@ -1,22 +0,0 @@
1/* gcclib.h -- definitions for various functions 'borrowed' from gcc-2.95.3 */
2/* I Molton 29/07/01 */
3
4#include <linux/types.h>
5
6#define BITS_PER_UNIT 8
7#define SI_TYPE_SIZE (sizeof(s32) * BITS_PER_UNIT)
8
9#ifdef __ARMEB__
10struct DIstruct {
11 s32 high, low;
12};
13#else
14struct DIstruct {
15 s32 low, high;
16};
17#endif
18
19typedef union {
20 struct DIstruct s;
21 s64 ll;
22} DIunion;
diff --git a/arch/arm/lib/lshrdi3.S b/arch/arm/lib/lshrdi3.S
new file mode 100644
index 000000000000..46c2ed19ec95
--- /dev/null
+++ b/arch/arm/lib/lshrdi3.S
@@ -0,0 +1,48 @@
1/* Copyright 1995, 1996, 1998, 1999, 2000, 2003, 2004, 2005
2 Free Software Foundation, Inc.
3
4This file is free software; you can redistribute it and/or modify it
5under the terms of the GNU General Public License as published by the
6Free Software Foundation; either version 2, or (at your option) any
7later version.
8
9In addition to the permissions in the GNU General Public License, the
10Free Software Foundation gives you unlimited permission to link the
11compiled version of this file into combinations with other programs,
12and to distribute those combinations without any restriction coming
13from the use of this file. (The General Public License restrictions
14do apply in other respects; for example, they cover modification of
15the file, and distribution when not linked into a combine
16executable.)
17
18This file is distributed in the hope that it will be useful, but
19WITHOUT ANY WARRANTY; without even the implied warranty of
20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21General Public License for more details.
22
23You should have received a copy of the GNU General Public License
24along with this program; see the file COPYING. If not, write to
25the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26Boston, MA 02110-1301, USA. */
27
28
29#include <linux/linkage.h>
30
31#ifdef __ARMEB__
32#define al r1
33#define ah r0
34#else
35#define al r0
36#define ah r1
37#endif
38
39ENTRY(__lshrdi3)
40
41 subs r3, r2, #32
42 rsb ip, r2, #32
43 movmi al, al, lsr r2
44 movpl al, ah, lsr r3
45 orrmi al, al, ah, lsl ip
46 mov ah, ah, lsr r2
47 mov pc, lr
48
diff --git a/arch/arm/lib/lshrdi3.c b/arch/arm/lib/lshrdi3.c
deleted file mode 100644
index 3681f49d2b6e..000000000000
--- a/arch/arm/lib/lshrdi3.c
+++ /dev/null
@@ -1,56 +0,0 @@
1/* More subroutines needed by GCC output code on some machines. */
2/* Compile this one with gcc. */
3/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22/* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton 29/07/01 */
31
32#include "gcclib.h"
33
34s64 __lshrdi3(s64 u, int b)
35{
36 DIunion w;
37 int bm;
38 DIunion uu;
39
40 if (b == 0)
41 return u;
42
43 uu.ll = u;
44
45 bm = (sizeof(s32) * BITS_PER_UNIT) - b;
46 if (bm <= 0) {
47 w.s.high = 0;
48 w.s.low = (u32) uu.s.high >> -bm;
49 } else {
50 u32 carries = (u32) uu.s.high << bm;
51 w.s.high = (u32) uu.s.high >> b;
52 w.s.low = ((u32) uu.s.low >> b) | carries;
53 }
54
55 return w.ll;
56}
diff --git a/arch/arm/lib/muldi3.S b/arch/arm/lib/muldi3.S
new file mode 100644
index 000000000000..c7fbdf005319
--- /dev/null
+++ b/arch/arm/lib/muldi3.S
@@ -0,0 +1,44 @@
1/*
2 * linux/arch/arm/lib/muldi3.S
3 *
4 * Author: Nicolas Pitre
5 * Created: Oct 19, 2005
6 * Copyright: Monta Vista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/linkage.h>
14
15#ifdef __ARMEB__
16#define xh r0
17#define xl r1
18#define yh r2
19#define yl r3
20#else
21#define xl r0
22#define xh r1
23#define yl r2
24#define yh r3
25#endif
26
27ENTRY(__muldi3)
28
29 mul xh, yl, xh
30 mla xh, xl, yh, xh
31 mov ip, xl, asr #16
32 mov yh, yl, asr #16
33 bic xl, xl, ip, lsl #16
34 bic yl, yl, yh, lsl #16
35 mla xh, yh, ip, xh
36 mul yh, xl, yh
37 mul xl, yl, xl
38 mul ip, yl, ip
39 adds xl, xl, yh, lsl #16
40 adc xh, xh, yh, lsr #16
41 adds xl, xl, ip, lsl #16
42 adc xh, xh, ip, lsr #16
43 mov pc, lr
44
diff --git a/arch/arm/lib/muldi3.c b/arch/arm/lib/muldi3.c
deleted file mode 100644
index 0a3b93313f18..000000000000
--- a/arch/arm/lib/muldi3.c
+++ /dev/null
@@ -1,72 +0,0 @@
1/* More subroutines needed by GCC output code on some machines. */
2/* Compile this one with gcc. */
3/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22/* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton 29/07/01 */
31
32#include "gcclib.h"
33
34#define umul_ppmm(xh, xl, a, b) \
35{register u32 __t0, __t1, __t2; \
36 __asm__ ("%@ Inlined umul_ppmm \n\
37 mov %2, %5, lsr #16 \n\
38 mov %0, %6, lsr #16 \n\
39 bic %3, %5, %2, lsl #16 \n\
40 bic %4, %6, %0, lsl #16 \n\
41 mul %1, %3, %4 \n\
42 mul %4, %2, %4 \n\
43 mul %3, %0, %3 \n\
44 mul %0, %2, %0 \n\
45 adds %3, %4, %3 \n\
46 addcs %0, %0, #65536 \n\
47 adds %1, %1, %3, lsl #16 \n\
48 adc %0, %0, %3, lsr #16" \
49 : "=&r" ((u32) (xh)), \
50 "=r" ((u32) (xl)), \
51 "=&r" (__t0), "=&r" (__t1), "=r" (__t2) \
52 : "r" ((u32) (a)), \
53 "r" ((u32) (b)));}
54
55#define __umulsidi3(u, v) \
56 ({DIunion __w; \
57 umul_ppmm (__w.s.high, __w.s.low, u, v); \
58 __w.ll; })
59
60s64 __muldi3(s64 u, s64 v)
61{
62 DIunion w;
63 DIunion uu, vv;
64
65 uu.ll = u, vv.ll = v;
66
67 w.ll = __umulsidi3(uu.s.low, vv.s.low);
68 w.s.high += ((u32) uu.s.low * (u32) vv.s.high
69 + (u32) uu.s.high * (u32) vv.s.low);
70
71 return w.ll;
72}
diff --git a/arch/arm/lib/ucmpdi2.S b/arch/arm/lib/ucmpdi2.S
new file mode 100644
index 000000000000..112630f93e5d
--- /dev/null
+++ b/arch/arm/lib/ucmpdi2.S
@@ -0,0 +1,35 @@
1/*
2 * linux/arch/arm/lib/ucmpdi2.S
3 *
4 * Author: Nicolas Pitre
5 * Created: Oct 19, 2005
6 * Copyright: Monta Vista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/linkage.h>
14
15#ifdef __ARMEB__
16#define xh r0
17#define xl r1
18#define yh r2
19#define yl r3
20#else
21#define xl r0
22#define xh r1
23#define yl r2
24#define yh r3
25#endif
26
27ENTRY(__ucmpdi2)
28
29 cmp xh, yh
30 cmpeq xl, yl
31 movlo r0, #0
32 moveq r0, #1
33 movhi r0, #2
34 mov pc, lr
35
diff --git a/arch/arm/lib/ucmpdi2.c b/arch/arm/lib/ucmpdi2.c
deleted file mode 100644
index 57f3f2df3850..000000000000
--- a/arch/arm/lib/ucmpdi2.c
+++ /dev/null
@@ -1,49 +0,0 @@
1/* More subroutines needed by GCC output code on some machines. */
2/* Compile this one with gcc. */
3/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
21
22/* As a special exception, if you link this library with other files,
23 some of which are compiled with GCC, to produce an executable,
24 this library does not by itself cause the resulting executable
25 to be covered by the GNU General Public License.
26 This exception does not however invalidate any other reasons why
27 the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton 29/07/01 */
31
32#include "gcclib.h"
33
34int __ucmpdi2(s64 a, s64 b)
35{
36 DIunion au, bu;
37
38 au.ll = a, bu.ll = b;
39
40 if ((u32) au.s.high < (u32) bu.s.high)
41 return 0;
42 else if ((u32) au.s.high > (u32) bu.s.high)
43 return 2;
44 if ((u32) au.s.low < (u32) bu.s.low)
45 return 0;
46 else if ((u32) au.s.low > (u32) bu.s.low)
47 return 2;
48 return 1;
49}
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