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Revert "lavc/sbrdsp: R-V V neg_odd_64"

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While this function can easily be written with vectors, it just fails to
get any performance improvement.

For reference, this is a simpler loop-free implementation that does get
better performance than the current one depending on hardware, but still
more or less the same metrics as the C code:

 func ff_sbr_neg_odd_64_rvv, zve64x
         li      a1, 32
         addi    a0, a0, 7
         li      t0, 8
         vsetvli zero, a1, e8, m2, ta, ma
         li      t1, 0x80
         vlse8.v v8, (a0), t0
         vxor.vx v8, v8, t1
         vsse8.v v8, (a0), t0
         ret
 endfunc

This reverts commit d06fd18f8f.
This commit is contained in:
Rémi Denis-Courmont 2024-05-13 19:39:47 +03:00
parent d452db8410
commit 7591eb4055
2 changed files with 0 additions and 22 deletions
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5
libavcodec/riscv/sbrdsp_init.c
View File

@ -26,7 +26,6 @@
void ff_sbr_sum64x5_rvv(float *z);
float ff_sbr_sum_square_rvv(float (*x)[2], int n);
void ff_sbr_neg_odd_64_rvv(float *x);
void ff_sbr_autocorrelate_rvv(const float x[40][2], float phi[3][2][2]);
void ff_sbr_hf_gen_rvv(float (*X_high)[2], const float (*X_low)[2],
const float alpha0[2], const float alpha1[2],
@ -64,9 +63,5 @@ av_cold void ff_sbrdsp_init_riscv(SBRDSPContext *c)
}
c->autocorrelate = ff_sbr_autocorrelate_rvv;
}
#if __riscv_xlen >= 64
if ((flags & AV_CPU_FLAG_RVV_I64) && (flags & AV_CPU_FLAG_RVB_ADDR))
c->neg_odd_64 = ff_sbr_neg_odd_64_rvv;
#endif
#endif
}

17
libavcodec/riscv/sbrdsp_rvv.S
View File

@ -68,23 +68,6 @@ NOHWF fmv.x.w a0, fa0
ret
endfunc
#if __riscv_xlen >= 64
func ff_sbr_neg_odd_64_rvv, zve64x
li a1, 32
li t1, 1 << 63
1:
vsetvli t0, a1, e64, m8, ta, ma
vle64.v v8, (a0)
sub a1, a1, t0
vxor.vx v8, v8, t1
vse64.v v8, (a0)
sh3add a0, t0, a0
bnez t0, 1b
ret
endfunc
#endif
func ff_sbr_autocorrelate_rvv, zve32f
vsetvli t0, zero, e32, m4, ta, ma
vmv.v.x v0, zero