dequant.s

这个是H.264解码部分,4*4残差块的反量化ARM汇编代码.

			  AREA           IQ,CODE,READONLY
			  EXPORT         ARM_dequant
			  IMPORT         udivide
			  IMPORT         dequantcoeff
			  IMPORT         dequantdata
			  IMPORT         dequant_after
			  
num           EQU            16
			  
			  
              			
ARM_dequant       
              LDR            SP,=0x40000000
              STMFD          SP!,{R3-R12,LR}
              LDR            R5,dequantcoeff_addr
              LDR            R6,dequantdata_addr
              LDR            R11,dequant_after_addr
              MOV            R10,#num
              MOV            R4,R6
              BL             udivide
              ADD            R5,R5,R1,LSL #6
              
dequanting    
              LDR            R7,[R5],#4
              LDR            R8,[R6],#4
              MUL            R9,R8,R7
              MOV            R9,R9,LSL R0
              STR            R9,[R4],#4
              SUB            R10,R10,#1
              CMP            R10,#0
              BNE            dequanting
              LDMFD          SP!,{R3-R12,LR}
              MOV            PC,LR
                                                     
dequantcoeff_addr               
              DCD            dequantcoeff 

dequantdata_addr
              DCD            dequantdata
      
dequant_after_addr
              DCD            dequant_after
              
              END