Implement ≠` with AVX-512 clmul and GFNI

This commit is contained in:
Marshall Lochbaum 2023-12-29 19:09:53 -05:00
parent 9dc44ed1a9
commit 92db3f15d0
3 changed files with 43 additions and 4 deletions

@ -1 +1 @@
Subproject commit 528faaf9e2a7f4f3434365bcd91d6c18c87c4f08
Subproject commit 5f9cbd46c265491ff167a5d9377d1462539dbdd8

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@ -0,0 +1,11 @@
local def re_mask{M, sub} = {
def l = vcount{M}; def w = max{32,l}
sub{fmtnat{l}, fmtnat{w}, ty_u{w}}
}
local def ismask{M} = if (isvec{M}) u1==eltype{M} else 0
def reinterpret{M, a:T & ismask{M} & width{T}==width{M}} = {
re_mask{M, {l,w,W} => emit{M, merge{'_cvtu',w,'_mask',l}, promote{W, a}}}
}
def reinterpret{T, a:M & ismask{M} & width{T}==width{M}} = {
re_mask{M, {l,w,W} => cast_i{T, emit{W, merge{'_cvtmask',l,'_u',w}, a}}}
}

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@ -1,5 +1,8 @@
include './base'
include './clmul'
if (hasarch{'X86_64'}) {
if (hasarch{'PCLMUL'}) include './clmul'
if (hasarch{'AVX512BW', 'VPCLMULQDQ', 'GFNI'}) include './avx512'
}
include './mask'
include './f64'
include './scan_common'
@ -77,7 +80,7 @@ fn scan_neq{}(p:u64, x:*u64, r:*u64, nw:u64) : void = {
p = -(r>>63) # repeat sign bit
}
}
fn clmul_scan_ne_any{..._ & hasarch{'PCLMUL'}}(x:*void, r:*void, init:u64, words:u64, mark:u64) : void = {
fn clmul_scan_ne_any{& hasarch{'PCLMUL'}}(x:*void, r:*void, init:u64, words:u64, mark:u64) : void = {
def V = [2]u64
m := V**mark
def xor64{a, i, carry} = { # carry is 64-bit broadcasted current total
@ -98,9 +101,34 @@ fn clmul_scan_ne_any{..._ & hasarch{'PCLMUL'}}(x:*void, r:*void, init:u64, words
storeLow{rv+e, 64, clmul{loadLow{xv+e, 64}, m, 0} ^ c}
}
}
fn scan_neq{..._ & hasarch{'PCLMUL'}}(init:u64, x:*u64, r:*u64, nw:u64) : void = {
fn scan_neq{& hasarch{'PCLMUL'}}(init:u64, x:*u64, r:*u64, nw:u64) : void = {
clmul_scan_ne_any{}(*void~~x, *void~~r, init, nw, -(u64~~1))
}
fn scan_neq{& hasarch{'AVX512BW', 'VPCLMULQDQ', 'GFNI'}}(init:u64, x:*u64, r:*u64, nw:u64) : void = {
def emitM{T,s,...a} = emit{T, merge{'_mm512_',s}, ...a}
def V = [8]u64
def sse{a} = make{[2]u64, a, 0}
carry := sse{init}
# xor-scan on bytes
xmat := V**base{256, 1<<(8-iota{8}) - 1}
def xor8 = emitM{V, 'gf2p8affine_epi64_epi8', ., xmat, 0}
# Exclusive xor-scan on one word
def exor64 = clmul{., sse{1<<64 - 2}, 0}
@for (xv in *V~~x, rv in *V~~r over i to cdiv{nw,vcount{V}}) {
x8 := xor8{xv}
hb := sse{u64~~emitM{[64]u1, 'movepi8_mask', x8}}
xh := exor64{hb} # Exclusive xor of high bits
xc := xh ^ carry
v := x8 ^ emitM{V, 'movm_epi8', [64]u1~~extract{xc,0}}
carry = (xc ^ hb) ^ shuf{[4]u32, xh, 4b3232}
rem:= nw - 8*i
if (rem < 8) {
emitM{void, 'mask_storeu_epi64', *V~~r+i, [8]u1~~(~(u8~~0xff<<rem)), v}
return{}
}
rv = v
}
}
export{'si_scan_ne', scan_neq{}}
# Boolean cumulative sum