From 324eba69f7193367a28f31411f5ded9d7eb2eb48 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= Date: Sat, 27 Jul 2024 18:31:07 +0300 Subject: [PATCH] lavc/vc1dsp: use saturating arithmetic for RVV inv_trans_dc T-Head C908 (cycles): vc1dsp.vc1_inv_trans_4x4_dc_c: 113.7 vc1dsp.vc1_inv_trans_4x4_dc_rvv_i32: 46.5 (before) vc1dsp.vc1_inv_trans_4x4_dc_rvv_i32: 45.5 (after) vc1dsp.vc1_inv_trans_4x8_dc_c: 230.7 vc1dsp.vc1_inv_trans_4x8_dc_rvv_i32: 65.7 (before) vc1dsp.vc1_inv_trans_4x8_dc_rvv_i32: 52.5 (after) vc1dsp.vc1_inv_trans_8x4_dc_c: 246.7 vc1dsp.vc1_inv_trans_8x4_dc_rvv_i64: 56.7 (before) vc1dsp.vc1_inv_trans_8x4_dc_rvv_i64: 45.5 (after) vc1dsp.vc1_inv_trans_8x8_dc_c: 419.7 vc1dsp.vc1_inv_trans_8x8_dc_rvv_i64: 81.2 (before) vc1dsp.vc1_inv_trans_8x8_dc_rvv_i64: 53.5 (after) --- libavcodec/riscv/vc1dsp_rvv.S | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/libavcodec/riscv/vc1dsp_rvv.S b/libavcodec/riscv/vc1dsp_rvv.S index 548ef9d3bf..f9b59688ae 100644 --- a/libavcodec/riscv/vc1dsp_rvv.S +++ b/libavcodec/riscv/vc1dsp_rvv.S @@ -38,18 +38,20 @@ func ff_vc1_inv_trans_\cols\()x\rows\()_dc_rvv, zve64x, zba .endif addi t2, t2, 64 srai t2, t2, 7 -.if \rows * \cols == 64 - vsetvli zero, t0, e16, m8, ta, ma -.elseif \rows * \cols == 32 - vsetvli zero, t0, e16, m4, ta, ma +.if \rows * \cols >= 32 + vsetvli zero, t0, e8, m\mat_lmul, ta, ma .else - vsetivli zero, \rows * \cols, e16, m2, ta, ma + vsetivli zero, \rows * \cols, e8, m\mat_lmul, ta, ma .endif - vzext.vf2 v8, v0 - vadd.vx v8, v8, t2 - vmax.vx v8, v8, zero - vsetvli zero, zero, e8, m\mat_lmul, ta, ma - vnclipu.wi v0, v8, 0 + bgez t2, 1f + + neg t2, t2 + vssubu.vx v0, v0, t2 + vsetivli zero, \rows, e8, m\row_lmul, ta, ma + vsse\w\().v v0, (a0), a1 + ret +1: + vsaddu.vx v0, v0, t2 vsetivli zero, \rows, e8, m\row_lmul, ta, ma vsse\w\().v v0, (a0), a1 ret