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@/******************************************************************************
@ *
@ * Copyright (C) 2018 The Android Open Source Project
@ *
@ * Licensed under the Apache License, Version 2.0 (the "License");
@ * you may not use this file except in compliance with the License.
@ * You may obtain a copy of the License at:
@ *
@ * http://www.apache.org/licenses/LICENSE-2.0
@ *
@ * Unless required by applicable law or agreed to in writing, software
@ * distributed under the License is distributed on an "AS IS" BASIS,
@ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@ * See the License for the specific language governing permissions and
@ * limitations under the License.
@ *
@ *****************************************************************************
@ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
@*/
.text
.p2align 2
.global ixheaacd_expsubbandsamples_armv7
ixheaacd_expsubbandsamples_armv7:
STMFD sp!, {r4-r12}
LDR r7, [sp, #0x24]
LDR r10, [sp, #0x28]
SUB r11, r3, r2
MOV r12, #1
CMP r7, r10
BGE EXIT
MOVS r3, r11
BEQ EXIT
LDR r4, [sp, #0x2c]
CMP r4, #0
BEQ HQ_OUTER_LOOP
SUB r10, r10, r7
ADD r0, r0, r7, LSL #2
LDR r1, [r0], #4
OUTERLOOP:
MOV r3, r11
ADD r5, r1, r2, LSL #2
INLOOP:
LDR r4, [r5], #4
SUBS r3, r3, #2
LDRGE r8, [r5], #4
EOR r1 , r4 , r4, asr #31
ORR r12, r12, r1
EORGE r1 , r8 , r8, asr #31
ORRGE r12, r12, r1
BGT INLOOP
SUBS r10, r10, #1
LDR r1, [r0], #4
BGT OUTERLOOP
B EXIT
HQ_OUTER_LOOP:
LDR r6, [r0, r7, LSL #2]
LDR r5, [r1, r7, LSL #2]
ADD r6, r6, r2, LSL #2
ADD r5, r5, r2, LSL #2
MOV r4, r11
HQ_IN_LOOP:
LDR r8, [r6], #4
LDR r9, [r5], #4
SUBS r4, r4, #2
EOR r3 , r8 , r8, asr #31
ORR r12, r12, r3
EOR r3 , r9 , r9, asr #31
ORR r12, r12, r3
LDRGE r8, [r6], #4
LDRGE r9, [r5], #4
EORGE r3 , r8 , r8, asr #31
ORRGE r12, r12, r3
EORGE r3 , r9 , r9, asr #31
ORRGE r12, r12, r3
BGT HQ_IN_LOOP
INLOEN:
ADD r7, r7, #1
CMP r7, r10
BLT HQ_OUTER_LOOP
EXIT:
CLZ r0, r12
SUB r0, r0, #1
LDMFD sp!, {r4-r12}
BX lr
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