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aarch64/hevcdsp_idct_neon: Optimize idct dc

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clang does better than the assembly code before the patch, especially
for small size:

hevc_idct_4x4_dc_8_c:                                   11.2 ( 1.00x)
hevc_idct_4x4_dc_8_neon:                                15.5 ( 0.73x)
hevc_idct_4x4_dc_10_c:                                  12.0 ( 1.00x)
hevc_idct_4x4_dc_10_neon:                               15.2 ( 0.79x)
hevc_idct_8x8_dc_8_c:                                   13.2 ( 1.00x)
hevc_idct_8x8_dc_8_neon:                                18.2 ( 0.73x)
hevc_idct_8x8_dc_10_c:                                  13.5 ( 1.00x)
hevc_idct_8x8_dc_10_neon:                               17.2 ( 0.78x)
hevc_idct_16x16_dc_8_c:                                 41.8 ( 1.00x)
hevc_idct_16x16_dc_8_neon:                              37.8 ( 1.11x)
hevc_idct_16x16_dc_10_c:                                41.8 ( 1.00x)
hevc_idct_16x16_dc_10_neon:                             37.8 ( 1.11x)
hevc_idct_32x32_dc_8_c:                                130.2 ( 1.00x)
hevc_idct_32x32_dc_8_neon:                             132.2 ( 0.98x)
hevc_idct_32x32_dc_10_c:                               130.2 ( 1.00x)
hevc_idct_32x32_dc_10_neon:                            132.2 ( 0.98x)

This patch basically clone what the compiler does, so the performance
is the same.

Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili
2025-02-20 00:50:23 +08:00
parent 5a32496962
commit 5977bff569
1 changed files with 31 additions and 28 deletions
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59
libavcodec/aarch64/hevcdsp_idct_neon.S
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@ -888,38 +888,41 @@ function ff_hevc_transform_luma_4x4_neon_8, export=1
ret
endfunc
.macro idct_8x8_dc_store offset
.irp i, 0x0, 0x20, 0x40, 0x60
stp q0, q0, [x0, #(\offset + \i)]
.endr
.endm
.macro idct_16x16_dc_store
.irp index, 0x0, 0x80, 0x100, 0x180
idct_8x8_dc_store offset=\index
.endr
.endm
// void ff_hevc_idct_NxN_dc_DEPTH_neon(int16_t *coeffs)
.macro idct_dc size, bitdepth
function ff_hevc_idct_\size\()x\size\()_dc_\bitdepth\()_neon, export=1
ld1r {v4.8h}, [x0]
srshr v4.8h, v4.8h, #1
srshr v0.8h, v4.8h, #(14 - \bitdepth)
srshr v1.8h, v4.8h, #(14 - \bitdepth)
.if \size > 4
srshr v2.8h, v4.8h, #(14 - \bitdepth)
srshr v3.8h, v4.8h, #(14 - \bitdepth)
.if \size > 16 /* dc 32x32 */
mov x2, #4
ldrsh w1, [x0]
add w1, w1, #1
asr w1, w1, #1
add w1, w1, #(1 << (13 - \bitdepth))
asr w1, w1, #(14 - \bitdepth)
dup v0.8h, w1
.if \size < 8
stp q0, q0, [x0]
.elseif \size < 16
idct_8x8_dc_store 0x0
.elseif \size < 32
idct_16x16_dc_store
.else
add x2, x0, #(32 * 32 * 2)
1:
subs x2, x2, #1
.endif
add x12, x0, #64
mov x13, #128
.if \size > 8 /* dc 16x16 */
st1 {v0.8h-v3.8h}, [x0], x13
st1 {v0.8h-v3.8h}, [x12], x13
st1 {v0.8h-v3.8h}, [x0], x13
st1 {v0.8h-v3.8h}, [x12], x13
st1 {v0.8h-v3.8h}, [x0], x13
st1 {v0.8h-v3.8h}, [x12], x13
.endif /* dc 8x8 */
st1 {v0.8h-v3.8h}, [x0], x13
st1 {v0.8h-v3.8h}, [x12], x13
.if \size > 16 /* dc 32x32 */
bne 1b
.endif
.else /* dc 4x4 */
st1 {v0.8h-v1.8h}, [x0]
idct_16x16_dc_store
add x0, x0, #(16 * 16 * 2)
cmp x0, x2
b.lt 1b
.endif
ret
endfunc