ref: 0271c75afe5ff91239a033965d311743f88c5440
dir: /vp8/common/arm/neon/idct_dequant_0_2x_neon.asm/
;
; Copyright (c) 2010 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 |idct_dequant_0_2x_neon|
ARM
REQUIRE8
PRESERVE8
AREA ||.text||, CODE, READONLY, ALIGN=2
;void idct_dequant_0_2x_neon(short *q, short dq,
; unsigned char *dst, int stride);
; r0 *q
; r1 dq
; r2 *dst
; r3 stride
|idct_dequant_0_2x_neon| PROC
push {r4, r5}
vpush {d8-d15}
add r12, r2, #4
vld1.32 {d2[0]}, [r2], r3
vld1.32 {d8[0]}, [r12], r3
vld1.32 {d2[1]}, [r2], r3
vld1.32 {d8[1]}, [r12], r3
vld1.32 {d4[0]}, [r2], r3
vld1.32 {d10[0]}, [r12], r3
vld1.32 {d4[1]}, [r2], r3
vld1.32 {d10[1]}, [r12], r3
ldrh r12, [r0] ; lo q
ldrh r4, [r0, #32] ; hi q
mov r5, #0
strh r5, [r0]
strh r5, [r0, #32]
sxth r12, r12 ; lo
mul r0, r12, r1
add r0, r0, #4
asr r0, r0, #3
vdup.16 q0, r0
sxth r4, r4 ; hi
mul r0, r4, r1
add r0, r0, #4
asr r0, r0, #3
vdup.16 q3, r0
vaddw.u8 q1, q0, d2 ; lo
vaddw.u8 q2, q0, d4
vaddw.u8 q4, q3, d8 ; hi
vaddw.u8 q5, q3, d10
sub r2, r2, r3, lsl #2 ; dst - 4*stride
add r0, r2, #4
vqmovun.s16 d2, q1 ; lo
vqmovun.s16 d4, q2
vqmovun.s16 d8, q4 ; hi
vqmovun.s16 d10, q5
vst1.32 {d2[0]}, [r2], r3 ; lo
vst1.32 {d8[0]}, [r0], r3 ; hi
vst1.32 {d2[1]}, [r2], r3
vst1.32 {d8[1]}, [r0], r3
vst1.32 {d4[0]}, [r2], r3
vst1.32 {d10[0]}, [r0], r3
vst1.32 {d4[1]}, [r2]
vst1.32 {d10[1]}, [r0]
vpop {d8-d15}
pop {r4, r5}
bx lr
ENDP ; |idct_dequant_0_2x_neon|
END