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: 9641 21 ;// Date: Thursday, February 7, 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
