asmfunc.s

实现aac编码 解码的源代码！

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;/* assembly.s
; * 
; * the assembly routines are written in this separate .s file because EVC++ won't inline...
; *
; * Notes on APCS (ARM procedure call standard):
; *  - first four arguments are in r0-r3
; *  - additional argumets are pushed onto stack in reverse order
; *  - return value goes in r0
; *  - routines can overwrite r0-r3, r12 without saving
; *  - other registers must be preserved with stm/ldm commands
; * 
; * Equivalent register names:
; *
; * r0  r1  r2  r3  r4  r5  r6  r7  r8  r9  r10 r11 r12 r13 r14 r15
; * ---------------------------------------------------------------
; * a1  a2  a3  a4  v1  v2  v3  v4  v5  v6  sl  fp  ip  sp  lr  pc
; */

	AREA	|.text|, CODE, READONLY

; int MULSHIFT32(int x, int y);

	EXPORT	raac_MULSHIFT32
	
raac_MULSHIFT32

	smull	r2, r0, r1, r0
	mov		pc, lr

; __int64 MADD64(unsigned int sumLo, int sumHi, int a, int b);

	EXPORT raac_MADD64

raac_MADD64

   	smlal	r0, r1, r2, r3 
	mov		pc, lr

	END