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lavc/h264dsp: R-V V 8-bit h264_idct_add 

T-Head C908 (cycles):
h264_idct4_add_8bpp_c:      271.5
h264_idct4_add_8bpp_rvv_i32: 91.5
This commit is contained in:
Rémi Denis-Courmont 2024-07-02 22:03:07 +03:00
parent e0eff64ed1
commit f447189b0c
2 changed files with 83 additions and 2 deletions
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2
libavcodec/riscv/h264dsp_init.c
View File

@ -34,6 +34,7 @@ void ff_h264_h_loop_filter_luma_8_rvv(uint8_t *pix, ptrdiff_t stride,
void ff_h264_h_loop_filter_luma_mbaff_8_rvv(uint8_t *pix, ptrdiff_t stride,
int alpha, int beta, int8_t *tc0);
void ff_h264_idct_add_8_rvv(uint8_t *dst, int16_t *block, int stride);
void ff_h264_idct_add16_8_rvv(uint8_t *dst, const int *blockoffset,
int16_t *block, int stride,
const uint8_t nnzc[5 * 8]);
@ -63,6 +64,7 @@ av_cold void ff_h264dsp_init_riscv(H264DSPContext *dsp, const int bit_depth,
dsp->h264_h_loop_filter_luma_mbaff =
ff_h264_h_loop_filter_luma_mbaff_8_rvv;
dsp->h264_idct_add = ff_h264_idct_add_8_rvv;
# if __riscv_xlen == 64
dsp->h264_idct_add16 = ff_h264_idct_add16_8_rvv;
dsp->h264_idct_add16intra = ff_h264_idct_add16intra_8_rvv;

83
libavcodec/riscv/h264idct_rvv.S
View File

@ -26,6 +26,83 @@
#include "libavutil/riscv/asm.S"
.macro sx rd, addr
#if (__riscv_xlen == 32)
sw \rd, \addr
#elif (__riscv_xlen == 64)
sd \rd, \addr
#else
sq \rd, \addr
#endif
.endm
.variant_cc ff_h264_idct4_rvv
func ff_h264_idct4_rvv, zve32x
vsra.vi v5, v1, 1
vsra.vi v7, v3, 1
vadd.vv v8, v0, v2 # z0
vsub.vv v9, v0, v2 # z1
vsub.vv v10, v5, v3 # z2
vadd.vv v11, v1, v7 # z3
vadd.vv v1, v9, v10
vsub.vv v2, v9, v10
vadd.vv v0, v8, v11
vsub.vv v3, v8, v11
jr t0
endfunc
func ff_h264_idct_add_8_rvv, zve32x
csrwi vxrm, 0
.Lidct_add4_8_rvv:
vsetivli zero, 4, e16, mf2, ta, ma
addi t1, a1, 1 * 4 * 2
vle16.v v0, (a1)
addi t2, a1, 2 * 4 * 2
vle16.v v1, (t1)
addi t3, a1, 3 * 4 * 2
vle16.v v2, (t2)
vle16.v v3, (t3)
jal t0, ff_h264_idct4_rvv
vse16.v v0, (a1)
vse16.v v1, (t1)
vse16.v v2, (t2)
vse16.v v3, (t3)
vlseg4e16.v v0, (a1)
.rept 256 / __riscv_xlen
sx zero, ((__riscv_xlen / 8) * \+)(a1)
.endr
jal t0, ff_h264_idct4_rvv
add t1, a0, a2
vle8.v v4, (a0)
add t2, t1, a2
vle8.v v5, (t1)
add t3, t2, a2
vle8.v v6, (t2)
vle8.v v7, (t3)
.irp n,0,1,2,3
vssra.vi v\n, v\n, 6
.endr
vsetvli zero, zero, e8, mf4, ta, ma
vwaddu.wv v0, v0, v4
vwaddu.wv v1, v1, v5
vwaddu.wv v2, v2, v6
vwaddu.wv v3, v3, v7
vsetvli zero, zero, e16, mf2, ta, ma
.irp n,0,1,2,3
vmax.vx v\n, v\n, zero
.endr
vsetvli zero, zero, e8, mf4, ta, ma
vnclipu.wi v4, v0, 0
vnclipu.wi v5, v1, 0
vnclipu.wi v6, v2, 0
vnclipu.wi v7, v3, 0
vse8.v v4, (a0)
vse8.v v5, (t1)
vse8.v v6, (t2)
vse8.v v7, (t3)
ret
endfunc
const ff_h264_scan8
.byte 014, 015, 024, 025, 016, 017, 026, 027
.byte 034, 035, 044, 045, 036, 037, 046, 047
@ -34,6 +111,7 @@ endconst
#if (__riscv_xlen == 64)
.irp depth, 8
func ff_h264_idct_add16_\depth\()_rvv, zve32x
csrwi vxrm, 0
addi sp, sp, -80
lla t0, ff_h264_scan8
sd s0, (sp)
@ -83,7 +161,7 @@ func ff_h264_idct_add16_\depth\()_rvv, zve32x
call ff_h264_idct_dc_add_\depth\()_c
j 3f
2:
call ff_h264_idct_add_\depth\()_c
call .Lidct_add4_\depth\()_rvv
3:
srli s3, s3, 1
addi s5, s5, 4
@ -104,6 +182,7 @@ func ff_h264_idct_add16_\depth\()_rvv, zve32x
endfunc
func ff_h264_idct_add16intra_\depth\()_rvv, zve32x
csrwi vxrm, 0
addi sp, sp, -80
lla t0, ff_h264_scan8
sd s0, (sp)
@ -147,7 +226,7 @@ func ff_h264_idct_add16intra_\depth\()_rvv, zve32x
mv a2, s7
add a0, s4, t2
beqz t0, 2f # if (nnzc[scan8[i]])
call ff_h264_idct_add_\depth\()_c
call .Lidct_add4_\depth\()_rvv
j 3f
2:
beqz t1, 3f # if (block[i * 16])