1/* libs/opengles/iterators.S
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18
19    .text
20    .align
21    .arm
22
23    .global iterators0032
24    .type iterators0032, %function
25
26/*
27 * iterators0032
28 *
29 * MUST BE CALLED FROM ARM CODE
30 *
31 * r0: const compute_iterators_t* (this)
32 *      r0 + 0: m_dx01
33 *      r0 + 4: m_dy10
34 *      r0 + 8: m_dx20
35 *      r0 +12: m_dy02
36 *      r0 +16: m_x0
37 *      r0 +20: m_y0
38 *      r0 +24: m_area
39 *		r0 +28: m_scale
40 *		r0 +29: m_area_scale;
41 * r1: int32_t* (out)
42 *      r1 + 0: c
43 *      r1 + 4: dcdx
44 *      r1 + 8: dcdy
45 *   r2: c0
46 *   r3: c1
47 * [sp]: c2
48 */
49
50iterators0032:
51        stmfd	sp!, {r4, r5, r6, r7, r8, lr}
52        ldr     r4, [sp, #4*6]
53
54        ldrb    r12, [r0, #29]
55        sub     r3, r3, r2
56        sub     r4, r4, r2
57        sub     r12, r12, #16
58        mov     r3, r3, asr r12
59        mov     r4, r4, asr r12
60
61        ldr     r5, [r0, #0]
62        ldr     r12, [r0, #4]
63        smull   r8, lr, r4, r5
64        ldr     r5, [r0, #8]
65        smull   r6, r7, r4, r12
66        ldr     r12, [r0, #12]
67        smlal   r8, lr, r3, r5
68        smlal   r6, r7, r3, r12
69
70        ldr     r3, [r0, #16]        // m_x0
71        ldr     r4, [r0, #20]        // m_x1
72
73        str     r6, [r1, #4]
74        str     r8, [r1, #8]
75
76        umull   r6, r5, r3, r6
77        umull   r8, r0, r4, r8
78        mla     r7, r3, r7, r5
79        mla     lr, r4, lr, r0
80        adds    r6, r6, r8
81        adc     r7, r7, lr
82
83        movs    r6, r6, lsr #4
84        adc     r6, r6, r7, lsl #28
85        rsb     r6, r6, r2, lsl #16
86        str     r6, [r1, #0]
87
88        ldmfd	sp!, {r4, r5, r6, r7, r8, pc}
89
90