1dnl  PowerPC-32 mpn_sec_tabselect.
2
3dnl  Contributed to the GNU project by Torbj��rn Granlund.
4
5dnl  Copyright 2011-2013 Free Software Foundation, Inc.
6
7dnl  This file is part of the GNU MP Library.
8dnl
9dnl  The GNU MP Library is free software; you can redistribute it and/or modify
10dnl  it under the terms of either:
11dnl
12dnl    * the GNU Lesser General Public License as published by the Free
13dnl      Software Foundation; either version 3 of the License, or (at your
14dnl      option) any later version.
15dnl
16dnl  or
17dnl
18dnl    * the GNU General Public License as published by the Free Software
19dnl      Foundation; either version 2 of the License, or (at your option) any
20dnl      later version.
21dnl
22dnl  or both in parallel, as here.
23dnl
24dnl  The GNU MP Library is distributed in the hope that it will be useful, but
25dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
26dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
27dnl  for more details.
28dnl
29dnl  You should have received copies of the GNU General Public License and the
30dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
31dnl  see https://www.gnu.org/licenses/.
32
33include(`../config.m4')
34
35C                   cycles/limb
36C 603e:			 ?
37C 604e:			 ?
38C 75x (G3):		 ?
39C 7400,7410 (G4):	 2.5
40C 744x,745x (G4+):	 2.0
41C power4/ppc970:	 2.0
42C power5:		 ?
43
44define(`rp',     `r3')
45define(`tp',     `r4')
46define(`n',      `r5')
47define(`nents',  `r6')
48define(`which',  `r7')
49
50define(`i',      `r8')
51define(`j',      `r9')
52define(`stride', `r12')
53define(`mask',   `r11')
54
55
56ASM_START()
57PROLOGUE(mpn_sec_tabselect)
58	stwu	r1, -32(r1)
59	addic.	j, n, -4		C outer loop induction variable
60	stmw	r27, 8(r1)
61	slwi	stride, n, 2
62
63	blt	cr0, L(outer_end)
64L(outer_top):
65	mtctr	nents
66	mr	r10, tp
67	li	r28, 0
68	li	r29, 0
69	li	r30, 0
70	li	r31, 0
71	addic.	j, j, -4		C outer loop induction variable
72	mr	i, which
73
74	ALIGN(16)
75L(top):	addic	i, i, -1		C set carry iff i != 0
76	subfe	mask, mask, mask
77	lwz	r0, 0(tp)
78	lwz	r27, 4(tp)
79	and	r0, r0, mask
80	and	r27, r27, mask
81	or	r28, r28, r0
82	or	r29, r29, r27
83	lwz	r0, 8(tp)
84	lwz	r27, 12(tp)
85	and	r0, r0, mask
86	and	r27, r27, mask
87	or	r30, r30, r0
88	or	r31, r31, r27
89	add	tp, tp, stride
90	bdnz	L(top)
91
92	stw	r28, 0(rp)
93	stw	r29, 4(rp)
94	stw	r30, 8(rp)
95	stw	r31, 12(rp)
96	addi	tp, r10, 16
97	addi	rp, rp, 16
98	bge	cr0, L(outer_top)
99L(outer_end):
100
101	andi.	r0, n, 2
102	beq	cr0, L(b0x)
103L(b1x):	mtctr	nents
104	mr	r10, tp
105	li	r28, 0
106	li	r29, 0
107	mr	i, which
108	ALIGN(16)
109L(tp2):	addic	i, i, -1
110	subfe	mask, mask, mask
111	lwz	r0, 0(tp)
112	lwz	r27, 4(tp)
113	and	r0, r0, mask
114	and	r27, r27, mask
115	or	r28, r28, r0
116	or	r29, r29, r27
117	add	tp, tp, stride
118	bdnz	L(tp2)
119	stw	r28, 0(rp)
120	stw	r29, 4(rp)
121	addi	tp, r10, 8
122	addi	rp, rp, 8
123
124L(b0x):	andi.	r0, n, 1
125	beq	cr0, L(b00)
126L(b01):	mtctr	nents
127	mr	r10, tp
128	li	r28, 0
129	mr	i, which
130	ALIGN(16)
131L(tp1):	addic	i, i, -1
132	subfe	mask, mask, mask
133	lwz	r0, 0(tp)
134	and	r0, r0, mask
135	or	r28, r28, r0
136	add	tp, tp, stride
137	bdnz	L(tp1)
138	stw	r28, 0(rp)
139
140L(b00):	lmw	r27, 8(r1)
141	addi	r1, r1, 32
142	blr
143EPILOGUE()
144