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lavc/ac3dsp: R-V V min_exponents

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T-Head C908:
ac3_exponent_min_reuse0_c:         7.5
ac3_exponent_min_reuse0_rvv_i32:   7.5
ac3_exponent_min_reuse1_c:      1820.7
ac3_exponent_min_reuse1_rvv_i32: 102.5
ac3_exponent_min_reuse2_c:      3088.5
ac3_exponent_min_reuse2_rvv_i32: 138.7
ac3_exponent_min_reuse3_c:      5073.7
ac3_exponent_min_reuse3_rvv_i32: 174.7
ac3_exponent_min_reuse4_c:      4624.2
ac3_exponent_min_reuse4_rvv_i32: 204.2
ac3_exponent_min_reuse5_c:      5138.7
ac3_exponent_min_reuse5_rvv_i32: 238.0
This commit is contained in:
Rémi Denis-Courmont 2024-05-01 09:19:46 +03:00
parent 5e7180864f
commit 38f67a32b3
2 changed files with 26 additions and 0 deletions
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4
libavcodec/riscv/ac3dsp_init.c
View file

@ -26,6 +26,7 @@
#include "libavutil/cpu.h"
#include "libavcodec/ac3dsp.h"
void ff_ac3_exponent_min_rvv(uint8_t *exp, int, int);
void ff_extract_exponents_rvb(uint8_t *exp, int32_t *coef, int nb_coefs);
void ff_float_to_fixed24_rvv(int32_t *dst, const float *src, size_t len);
void ff_sum_square_butterfly_int32_rvv(int64_t *, const int32_t *,
@ -38,6 +39,9 @@ av_cold void ff_ac3dsp_init_riscv(AC3DSPContext *c)
#if HAVE_RV
int flags = av_get_cpu_flags();
if (flags & AV_CPU_FLAG_RVV_I32)
c->ac3_exponent_min = ff_ac3_exponent_min_rvv;
if (flags & AV_CPU_FLAG_RVB_ADDR) {
if (flags & AV_CPU_FLAG_RVB_BASIC)
c->extract_exponents = ff_extract_exponents_rvb;

22
libavcodec/riscv/ac3dsp_rvv.S
View file

@ -21,6 +21,28 @@
#include "config.h"
#include "libavutil/riscv/asm.S"
func ff_ac3_exponent_min_rvv, zve32x
beqz a1, 3f
1:
vsetvli t2, a2, e8, m8, ta, ma
vle8.v v8, (a0)
addi t0, a0, 256
sub a2, a2, t2
mv t1, a1
2:
vle8.v v16, (t0)
addi t1, t1, -1
vminu.vv v8, v8, v16
addi t0, t0, 256
bnez t1, 2b
vse8.v v8, (a0)
add a0, a0, t2
bnez a2, 1b
3:
ret
endfunc
func ff_float_to_fixed24_rvv, zve32f
li t1, 1 << 24
fcvt.s.w f0, t1