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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
@*/
.global ixheaacd_esbr_radix4bfly
ixheaacd_esbr_radix4bfly:
STMFD sp!, {r4-r12, r14}
SUB sp, sp, #16
MOV r6, #6
MUL r7, r6, r3
MOV r4, r3
STR r7, [sp]
MOV r3, r3, lsl #1
STR r2, [sp, #8]
STR r4, [sp, #12]
STR r4, [sp, #4]
ADD r2, r1, r3, lsl #2
ADD r0, r0, #16
RADIX4_OUTLOOP:
RADIX4_INLOOP:
LDR r6, [r1]
LDR r7, [r2]
LDR r8, [r2, r3, lsl #2]
LDR r9, [r2, r3, lsl #3]
ADD r10, r6, r8
SUB r11, r6, r8
ADD r12, r7, r9
SUB r14, r7, r9
ADD r6, r10, r12
SUB r7, r10, r12
STR r6, [r1], #4
LDR r8, [r1]
LDR r6, [r2, #4]!
LDR r9, [r2, r3, lsl #2]!
LDR r10, [r2, r3, lsl #2]!
ADD r12, r8, r9
SUB r8, r8, r9
ADD r9, r6, r10
SUB r6, r6, r10
ADD r10, r12, r9
STR r10, [r1], #4
SUB r12, r12, r9
ADD r9, r11, r6
SUB r10, r11, r6
ADD r11, r8, r14
LDR r5, [r0], #4
LDR r4, [r0], #-12
SUB r6, r8, r14
RSB r5, r5, #0
SMULL r14, r8, r10, r5
SMLAL r14, r8, r11, r4
RSB r5, r5, #0
MOV r8, r8, lsl #1
STR r8, [r2], #-4
SMULL r14, r8, r10, r4
SMLAL r14, r8, r11, r5
LDR r11, [r0], #4
LDR r4, [r0], #-12
MOV r8, r8, lsl #1
STR r8, [r2], -r3, lsl #2
SMULL r10, r8, r7, r4
SMLAL r10, r8, r12, r11
LDR r14, [r0], #4
MOV r5, r8, lsl #1
RSB r11, r11, #0
SMULL r10, r8, r7, r11
SMLAL r10, r8, r12, r4
LDR r4, [r0], #36
STR r5, [r2], #4
MOV r7, r8, lsl #1
RSB r14, r14, #0
SMULL r11, r12, r9, r14
SMLAL r11, r12, r6, r4
RSB r14, r14, #0
STR r7, [r2], -r3, lsl #2
MOV r12, r12, lsl #1
SMULL r10, r7, r9, r4
SMLAL r10, r7, r6, r14
STR r12, [r2], #-4
MOV r7, r7, lsl #1
STR r7, [r2], #8
LDR r4, [sp, #4]
SUBS r4, r4, #1
STR r4, [sp, #4]
BGT RADIX4_INLOOP
LDR r8, [sp]
LDR r4, [sp, #12]
LDR r6, [sp, #8]
SUB r0, r0, r8, lsl #2
ADD r1, r1, r8, lsl #2
ADD r2, r2, r8, lsl #2
STR r4, [sp, #4]
SUBS r6, r6, #1
STR r6, [sp, #8]
BGT RADIX4_OUTLOOP
ADD sp, sp, #16
LDMFD sp!, {r4-r12, r15}
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