AVX-512 compress implementations
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@ -145,18 +145,10 @@ fn slash2{T==i8 & hasarch{'AVX2'}}(w:*u64, x:*T, r:*T, l:u64, sum:u64) : void =
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}
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}
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# 8-bit writes ~8 bytes of garbage past end, 16-bit writes ~16 bytes
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if (hasarch{'BMI2'}) {
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export{'bmipopc_2slash8', slash2{i8}}
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export{'bmipopc_2slash16', slash2{i16}}
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export{'bmipopc_1slash8', slash1{i8}}
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export{'bmipopc_1slash16', slash1{i16}}
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}
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itab :*u64 = fold{{t,k} => join{each{tup,t,k+(t<<8)%(1<<64)}}, tup{0x8080808080808080}, reverse{iota{8}}}
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i64tab:*u32 = fold{{t,k} => join{each{tup,t,k+(t<<8)%(1<<32)}}, tup{0x80808080}, reverse{2*iota{4}}}
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fn avx2_compress{T & width{T}>=32}(wp:*u64, x:*T, r:*T, l:u64, sum:u64) : void = {
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fn slash2{T & hasarch{'AVX2'} & width{T}>=32}(wp:*u64, x:*T, r:*T, l:u64, sum:u64) : void = {
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def tw = width{T}
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def V = [8]u32
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expander := make{[32]u8, merge{...each{{i}=>tup{i, ... 3**128}, iota{8}>>lb{tw/32}}}}
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@ -179,9 +171,39 @@ fn avx2_compress{T & width{T}>=32}(wp:*u64, x:*T, r:*T, l:u64, sum:u64) : void =
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}
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}
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fn slash2{T & hasarch{if (width{T}>=32) 'AVX512F' else 'AVX512VBMI2'}}(w:*u64, x:*T, r:*T, l:u64, sum:u64) : void = {
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def f = match { {_==8}=>'8'; {_==16}=>'16'; {_==32}=>'32'; {_==64}=>'64' }
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def wt = width{T}
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def vl = 512/wt
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def V = [vl]T
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def wu = max{32,vl}
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def load {a:T, n & 512==width{eltype{T}}} = emit{eltype{T}, '_mm512_loadu_si512', a+n}
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@for (w in *(ty_u{vl})~~w, x in *V~~x over cdiv{l,vl}) {
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def I = ty_u{wu}
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def emitT{O, name, ...a} = emit{O, merge{'_mm512_',name,'_epi',f{wt}}, ...a}
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def to_mask{a} = emit{[vl]u1, merge{'_cvtu',f{wu},'_mask',f{vl}}, a}
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m := to_mask{promote{I,w}}
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c := popc{w}
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# The compress-store instruction performs very poorly on Zen4,
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# and is also a lot worse than the following on Tiger Lake
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# emitT{void, 'mask_compressstoreu', r, m, x}
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cs := cast_i{I,promote{i64,1}<<c - 1}
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if (wu==64) cs -= cast_i{I,c}>>6
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v := emitT{V, 'mask_compress', x, m, x}
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emitT{void, 'mask_storeu', r, to_mask{cs}, v}
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r += c
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}
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}
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if (hasarch{'BMI2'}) {
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export{'bmipopc_2slash8', slash2{i8}}
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export{'bmipopc_2slash16', slash2{i16}}
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export{'bmipopc_1slash8', slash1{i8}}
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export{'bmipopc_1slash16', slash1{i16}}
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}
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if (hasarch{'AVX2'}) {
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export{'avx2_2slash32', avx2_compress{i32}}
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export{'avx2_2slash64', avx2_compress{i64}}
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export{'avx2_2slash32', slash2{i32}}
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export{'avx2_2slash64', slash2{i64}}
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}
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# pext, or boolean compress
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