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lavu/float_dsp: optimise R-V V fmul_reverse & fmul_window
Roll the loop to avoid slow gathers. Before: vector_fmul_reverse_c: 1561.7 vector_fmul_reverse_rvv_f32: 2410.2 vector_fmul_window_c: 2068.2 vector_fmul_window_rvv_f32: 1879.5 After: vector_fmul_reverse_c: 1561.7 vector_fmul_reverse_rvv_f32: 916.2 vector_fmul_window_c: 2068.2 vector_fmul_window_rvv_f32: 1202.5
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@ -75,18 +75,19 @@ endfunc
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func ff_vector_fmul_window_rvv, zve32f
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// a0: dst, a1: src0, a2: src1, a3: window, a4: length
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vsetvli t0, zero, e16, m2, ta, ma
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// e16/m2 and e32/m4 are possible but slower due to gather.
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vsetvli t0, zero, e16, m1, ta, ma
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sh2add a2, a4, a2
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vid.v v0
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sh3add t3, a4, a3
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vadd.vi v0, v0, 1
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sh3add t0, a4, a0
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1:
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vsetvli t2, a4, e16, m2, ta, ma
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vsetvli t2, a4, e16, m1, ta, ma
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slli t4, t2, 2
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vrsub.vx v2, v0, t2
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sub t3, t3, t4
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vsetvli zero, zero, e32, m4, ta, ma
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vsetvli zero, zero, e32, m2, ta, ma
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sub a2, a2, t4
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vle32.v v8, (t3)
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sub t0, t0, t4
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@ -133,16 +134,17 @@ endfunc
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// TODO factor vrsub, separate last iteration?
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// (a0) = (a1) * reverse(a2) [0..a3-1]
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func ff_vector_fmul_reverse_rvv, zve32f
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vsetvli t0, zero, e16, m4, ta, ma
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// e16/m4 and e32/m8 are possible but slower due to gather.
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vsetvli t0, zero, e16, m1, ta, ma
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sh2add a2, a3, a2
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vid.v v0
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vadd.vi v0, v0, 1
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1:
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vsetvli t0, a3, e16, m4, ta, ma
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vsetvli t0, a3, e16, m1, ta, ma
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slli t1, t0, 2
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vrsub.vx v4, v0, t0 // v4[i] = [VL-1, VL-2... 1, 0]
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sub a2, a2, t1
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vsetvli zero, zero, e32, m8, ta, ma
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vsetvli zero, zero, e32, m2, ta, ma
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vle32.v v8, (a2)
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sub a3, a3, t0
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vle32.v v16, (a1)
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