armVCCOMM_s.h revision 21e525fdcc234c22d843a8bf1a4ec35c4b376314 
1;//
2;//
3;// File Name:  armVCCOMM_s.h
4;// OpenMAX DL: v1.0.2
5;// Revision:   12290
6;// Date:       Wednesday, April 9, 2008
7;//
8;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
9;//
10;//
11;//
12;// ARM optimized OpenMAX AC header file
13;//
14;// Formula used:
15;// MACRO for calculating median for three values.
16
17
18
19    IF :LNOT::DEF:ARMVCCOMM_S_H
20        INCLUDE armCOMM_s.h
21    M_VARIANTS      CortexA8, ARM1136JS
22
23    IF ARM1136JS :LOR: CortexA8
24
25     ;///*
26     ;// * Macro: M_MEDIAN3
27     ;// *
28     ;// * Description: Finds the median of three numbers
29     ;// *
30     ;// * Remarks:
31     ;// *
32     ;// * Parameters:
33     ;// * [in] x     First entry for the list of three numbers.
34     ;// * [in] y     Second entry for the list of three numbers.
35     ;// *            Input value may be corrupted at the end of
36     ;// *            the execution of this macro.
37     ;// * [in] z     Third entry of the list of three numbers.
38     ;// *            Input value corrupted at the end of the
39     ;// *            execution of this macro.
40     ;// * [in] t     Temporary scratch  register.
41     ;// * [out]z     Median of the three numbers.
42     ;// */
43
44     MACRO
45
46     M_MEDIAN3 $x, $y, $z, $t
47
48     SUBS  $t, $y, $z; // if (y < z)
49     ADDLT $z, $z, $t; //  swap y and z
50     SUBLT $y, $y, $t;
51
52     ;// Now z' <= y', so there are three cases for the
53     ;// median value, depending on x.
54
55     ;// 1) x <= z'      <= y'      : median value is z'
56     ;// 2)      z' <= x <= y'      : median value is x
57     ;// 3)      z'      <= y' <= x : median value is y'
58
59     CMP   $z, $x;     // if ( x > min(y,z) )
60     MOVLT $z, $x;     // ans = x
61
62     CMP   $x, $y;     // if ( x > max(y,z) )
63     MOVGT $z, $y;     // ans = max(y,z)
64
65     MEND
66    ENDIF
67
68
69
70    ENDIF ;// ARMACCOMM_S_H
71
72 END