ref: a23430834746ba4cbea146d47bf2cf100ac23f0d
dir: /vpx_dsp/arm/idct32x32_1_add_neon.asm/
;
; Copyright (c) 2013 The WebM project authors. All Rights Reserved.
;
; Use of this source code is governed by a BSD-style license and patent
; grant that can be found in the LICENSE file in the root of the source
; tree. All contributing project authors may be found in the AUTHORS
; file in the root of the source tree.
;
EXPORT |vpx_idct32x32_1_add_neon|
ARM
REQUIRE8
PRESERVE8
AREA ||.text||, CODE, READONLY, ALIGN=2
;TODO(hkuang): put the following macros in a seperate
;file so other idct function could also use them.
MACRO
LD_16x8 $src, $stride
vld1.8 {q8}, [$src], $stride
vld1.8 {q9}, [$src], $stride
vld1.8 {q10}, [$src], $stride
vld1.8 {q11}, [$src], $stride
vld1.8 {q12}, [$src], $stride
vld1.8 {q13}, [$src], $stride
vld1.8 {q14}, [$src], $stride
vld1.8 {q15}, [$src], $stride
MEND
MACRO
ADD_DIFF_16x8 $diff
vqadd.u8 q8, q8, $diff
vqadd.u8 q9, q9, $diff
vqadd.u8 q10, q10, $diff
vqadd.u8 q11, q11, $diff
vqadd.u8 q12, q12, $diff
vqadd.u8 q13, q13, $diff
vqadd.u8 q14, q14, $diff
vqadd.u8 q15, q15, $diff
MEND
MACRO
SUB_DIFF_16x8 $diff
vqsub.u8 q8, q8, $diff
vqsub.u8 q9, q9, $diff
vqsub.u8 q10, q10, $diff
vqsub.u8 q11, q11, $diff
vqsub.u8 q12, q12, $diff
vqsub.u8 q13, q13, $diff
vqsub.u8 q14, q14, $diff
vqsub.u8 q15, q15, $diff
MEND
MACRO
ST_16x8 $dst, $stride
vst1.8 {q8}, [$dst], $stride
vst1.8 {q9}, [$dst], $stride
vst1.8 {q10},[$dst], $stride
vst1.8 {q11},[$dst], $stride
vst1.8 {q12},[$dst], $stride
vst1.8 {q13},[$dst], $stride
vst1.8 {q14},[$dst], $stride
vst1.8 {q15},[$dst], $stride
MEND
;void vpx_idct32x32_1_add_neon(int16_t *input, uint8_t *dest,
; int dest_stride)
;
; r0 int16_t input
; r1 uint8_t *dest
; r2 int dest_stride
|vpx_idct32x32_1_add_neon| PROC
push {lr}
pld [r1]
add r3, r1, #16 ; r3 dest + 16 for second loop
ldrsh r0, [r0]
; generate cospi_16_64 = 11585
mov r12, #0x2d00
add r12, #0x41
; out = dct_const_round_shift(input[0] * cospi_16_64)
mul r0, r0, r12 ; input[0] * cospi_16_64
add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
asr r0, r0, #14 ; >> DCT_CONST_BITS
; out = dct_const_round_shift(out * cospi_16_64)
mul r0, r0, r12 ; out * cospi_16_64
mov r12, r1 ; save dest
add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
asr r0, r0, #14 ; >> DCT_CONST_BITS
; a1 = ROUND_POWER_OF_TWO(out, 6)
add r0, r0, #32 ; + (1 <<((6) - 1))
asrs r0, r0, #6 ; >> 6
bge diff_positive_32_32
diff_negative_32_32
neg r0, r0
usat r0, #8, r0
vdup.u8 q0, r0
mov r0, #4
diff_negative_32_32_loop
sub r0, #1
LD_16x8 r1, r2
SUB_DIFF_16x8 q0
ST_16x8 r12, r2
LD_16x8 r1, r2
SUB_DIFF_16x8 q0
ST_16x8 r12, r2
cmp r0, #2
moveq r1, r3
moveq r12, r3
cmp r0, #0
bne diff_negative_32_32_loop
pop {pc}
diff_positive_32_32
usat r0, #8, r0
vdup.u8 q0, r0
mov r0, #4
diff_positive_32_32_loop
sub r0, #1
LD_16x8 r1, r2
ADD_DIFF_16x8 q0
ST_16x8 r12, r2
LD_16x8 r1, r2
ADD_DIFF_16x8 q0
ST_16x8 r12, r2
cmp r0, #2
moveq r1, r3
moveq r12, r3
cmp r0, #0
bne diff_positive_32_32_loop
pop {pc}
ENDP ; |vpx_idct32x32_1_add_neon|
END