AVX2 k/bool for odd 64<k<256 using shift-based masks
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@ -45,6 +45,7 @@
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// COULD use pdep or similar to avoid overhead on small results
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// Otherwise, factor into power of 2 times odd
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// COULD fuse 2×odd, since 2/odd/ has a larger intermediate
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// 𝕨≤256, AVX2: Modular permutation with shift-based masks
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// Other typed 𝕩 uses +`, or lots of Singeli
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// Fixed shuffles, factorization, partial shuffles, self-overlapping
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// Otherwise, cell-by-cell copying
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@ -779,7 +780,10 @@ B slash_c2(B t, B w, B x) {
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if (xl == 0) {
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u64* xp = bitany_ptr(x);
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u64* rp; r = m_bitarrv(&rp, s);
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#if SINGELI
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#if SINGELI_AVX2
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if (wv <= 256) si_constrep_bool(wv, xp, rp, s);
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else
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#elif SINGELI
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if (wv <= 64) si_constrep_bool(wv, xp, rp, s);
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else
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#endif
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@ -296,7 +296,7 @@ if_inline (hasarch{'AARCH64'}) {
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}
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fn rep_const_bool{}(wv:usz, x:*u64, r:*u64, rlen:usz) : void = {
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assert{wv >= 2}; assert{wv <= 64}
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assert{wv >= 2}
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nw := cdiv{rlen, 64}
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if (wv&1 == 0) {
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p := ctz{wv | 8} # Power of two for second replicate
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@ -555,14 +555,15 @@ def proc_mod_dat{swap_data:W} = {
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else tup{8, get_byteperm{}}
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}
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# Fill in higher steps
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def get_mod_permuter{} = {
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def get_mod_permuter{width} = {
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def get_swap{l} = {
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def mask = extract_modperm_mask{swap_data, swap_lane, l}
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modperm_shuf_step{., l, mask}
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}
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def swap_x = on_len_range{get_swap, partwidth, ww}
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def swap_x = on_len_range{get_swap, partwidth, width}
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{x} => partperm{swap_x{x}}
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}
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def get_mod_permuter{} = get_mod_permuter{ww}
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tup{partperm, get_mod_permuter}
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}
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@ -577,15 +578,18 @@ def rep_const_bool_odd{k, x, r, nw} = {
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# Modular permutation: small-k cases may use a limited permutation
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# on bytes or 32-bit ints; general case uses the whole thing
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swtab:*W = each{modperm_dat{W, .}, 1+2*iota{32}}
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swap_data := load{swtab, k>>1}
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swap_data := load{swtab, (k%64)>>1}
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def {partperm, get_full_permute} = proc_mod_dat{swap_data}
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def sp_max = if (any_sel) 8 else 4
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if (k < sp_max) {
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rep_const_bool_small_odd{W, sp_max, k, getter{partperm}, output}
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} else {
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} else if (not avx2 or k < 64) {
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def get_swap_x = getter{get_full_permute{}}
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rep_const_bool_odd_mask4{W, k, get_swap_x, output, cdiv{nw, vcount{W}}}
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} else {
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def get_swap_x = getter{get_full_permute{64}}
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rep_const_bool_odd_loose_mask{W, k, get_swap_x, output}
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}
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flush{}
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}
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@ -599,6 +603,7 @@ def rep_const_bool_odd_mask4{
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} = {
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def ifvec{g} = match (M) { {[_](u64)} => g; {_} => ({v}=>v) }
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def scal = ifvec{{v} => M**v}
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assert{k < 64}
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# Fundamental operation: shifts act as order-k cyclic group on masks
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def advance{m, sh} = advance_spaced_mask{k, m, sh}
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@ -729,4 +734,55 @@ def rep_const_bool_small_odd{W=[wl](u64), max_wv, wv, get_perm_x, output} = {
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}
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}
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# Odd factors larger than 64
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# AVX2-only because scalar should be about as good otherwise
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def rep_const_bool_odd_loose_mask{V=[vl==4](u64), k, get_modperm_x, output if hasarch{'AVX2'}} = {
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assert{k > 64}
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# Distance from end to previous row boundary (-k <= q < 0)
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q := -make{V, 64*(1+iota{vl})}
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def q_mod{} = { d:=q+V**k; q = blend_top{q,d, d} }
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o:u64 = width{V}; while (o>k) { o-=k; q_mod{} }
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km:= k%64
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i:usz = 0; iv:usz = 0 # Words and vectors completed
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def step{perm, diff} = {
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# Mod-64 mask with 1 bit per word
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m:= V**1 << (q & V**63)
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# Indicator of which bits are actual boundaries
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def S = ty_s{V}; a:= S**(-65) < S~~q
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q-= V**o; q_mod{}
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# Set to bit from perm, but below a&m xor with diff to get previous
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base:= (m & perm) == m
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md:= (a & m) & diff
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output{base ^ (md + (md==m))}
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}
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{xp, xd, perm, diff}:= 4**(V**0)
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while (1) {
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# get_modperm_x permutes each 64-bit word
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# Each iteration of this loop handles one permuted word
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def first = shuf{., 4**0}
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if (i%4 == 0) {
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xp = get_modperm_x{}
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# Shift by 1, or k%64 in mod-space
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# Then the low bit of each word has to be moved to the next
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# As before, first bit is wrong but unused
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xl:= xp>>(64-km)
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xo:= (xp<<km | (xl &~ V**1)) | (shuf{xl, 3,0,1,2} & V**1)
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xd = xo ^ xp
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perm = first{xp}; diff = first{xd}
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} else {
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def upd{xq, q} = {
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xq = shuf{xq, 1,2,3,0} # Next word
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qs:= q; q = first{xq}
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blend_hom{q, qs, iota{V} < V**(i%4)}
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}
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step{upd{xp, perm}, upd{xd, diff}} # Do boundary between iterations
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++iv
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}
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i+= k
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ip:= iv; iv = i/4
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@for (iv - ip) step{perm, diff}
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}
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}
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export{'si_constrep_bool', rep_const_bool{}}
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