armVCCOMM_s.h revision 78e52bfac041d71ce53b5b13c2abf78af742b09d 
1;//
2;// Copyright (C) 2007-2008 ARM Limited
3;//
4;// Licensed under the Apache License, Version 2.0 (the "License");
5;// you may not use this file except in compliance with the License.
6;// You may obtain a copy of the License at
7;//
8;//      http://www.apache.org/licenses/LICENSE-2.0
9;//
10;// Unless required by applicable law or agreed to in writing, software
11;// distributed under the License is distributed on an "AS IS" BASIS,
12;// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13;// See the License for the specific language governing permissions and
14;// limitations under the License.
15;//
16;//
17;//
18;// File Name:  armVCCOMM_s.h
19;// OpenMAX DL: v1.0.2
20;// Revision:   12290
21;// Date:       Wednesday, April 9, 2008
22;//
23;//
24;//
25;//
26;// ARM optimized OpenMAX AC header file
27;//
28;// Formula used:
29;// MACRO for calculating median for three values.
30
31
32
33    IF :LNOT::DEF:ARMVCCOMM_S_H
34        INCLUDE armCOMM_s.h
35    M_VARIANTS      CortexA8, ARM1136JS
36
37    IF ARM1136JS :LOR: CortexA8
38
39     ;///*
40     ;// * Macro: M_MEDIAN3
41     ;// *
42     ;// * Description: Finds the median of three numbers
43     ;// *
44     ;// * Remarks:
45     ;// *
46     ;// * Parameters:
47     ;// * [in] x     First entry for the list of three numbers.
48     ;// * [in] y     Second entry for the list of three numbers.
49     ;// *            Input value may be corrupted at the end of
50     ;// *            the execution of this macro.
51     ;// * [in] z     Third entry of the list of three numbers.
52     ;// *            Input value corrupted at the end of the
53     ;// *            execution of this macro.
54     ;// * [in] t     Temporary scratch  register.
55     ;// * [out]z     Median of the three numbers.
56     ;// */
57
58     MACRO
59
60     M_MEDIAN3 $x, $y, $z, $t
61
62     SUBS  $t, $y, $z; // if (y < z)
63     ADDLT $z, $z, $t; //  swap y and z
64     SUBLT $y, $y, $t;
65
66     ;// Now z' <= y', so there are three cases for the
67     ;// median value, depending on x.
68
69     ;// 1) x <= z'      <= y'      : median value is z'
70     ;// 2)      z' <= x <= y'      : median value is x
71     ;// 3)      z'      <= y' <= x : median value is y'
72
73     CMP   $z, $x;     // if ( x > min(y,z) )
74     MOVLT $z, $x;     // ans = x
75
76     CMP   $x, $y;     // if ( x > max(y,z) )
77     MOVGT $z, $y;     // ans = max(y,z)
78
79     MEND
80    ENDIF
81
82
83
84    ENDIF ;// ARMACCOMM_S_H
85
86 END
87