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: armVCM4P2_Clip8_s.s 19 ; * OpenMAX DL: v1.0.2 20 ; * Revision: 9641 21 ; * Date: Thursday, February 7, 2008 22 ; * 23 ; * 24 ; * 25 ; * 26 ; * Description: 27 ; * Contains module for Clipping 16 bit value to [0,255] Range 28 ; */ 29 30 INCLUDE omxtypes_s.h 31 INCLUDE armCOMM_s.h 32 33 34 M_VARIANTS ARM1136JS 35 36 37 38 IF ARM1136JS 39 40 ;//Input Arguments 41 42 pSrc RN 0 43 pDst RN 1 44 step RN 2 45 46 ;// Local variables 47 48 x0 RN 3 49 x1 RN 4 50 x2 RN 5 51 x3 RN 6 52 53 Count RN 14 54 55 56 M_START armVCM4P2_Clip8,r6 57 58 59 MOV Count,#8 60 loop 61 62 LDMIA pSrc!,{x0, x1} 63 SUBS Count,Count, #1 ;// count down 64 LDMIA pSrc!,{x2, x3} 65 USAT16 x0, #8, x0 ;// clip two samples to [0,255] 66 USAT16 x1, #8, x1 ;// clip two samples to [0,255] 67 STRB x0, [pDst] 68 MOV x0, x0, LSR #16 69 STRB x0, [pDst,#1] 70 STRB x1, [pDst,#2] 71 MOV x1, x1, LSR #16 72 STRB x1, [pDst,#3] 73 74 USAT16 x2, #8, x2 ;// clip two samples to [0,255] 75 USAT16 x3, #8, x3 ;// clip two samples to [0,255] 76 STRB x2, [pDst,#4] 77 MOV x2, x2, LSR #16 78 STRB x2, [pDst,#5] 79 STRB x3, [pDst,#6] 80 MOV x3, x3, LSR #16 81 STRB x3, [pDst,#7] 82 ADD pDst,pDst,step ;// Increment pDst by step value 83 84 BGT loop ;// Continue loop until Count reaches 64 85 86 M_END 87 ENDIF 88 89 END 90
