Branchless i32 sparse Where

This commit is contained in:
Marshall Lochbaum 2022-09-10 13:13:41 -04:00
parent 017fcaea2a
commit 4999758497

View File

@ -104,6 +104,11 @@
#endif
#endif
#define WHERE_SPARSE(X,R,S) do { \
for (usz i=0, j=0; j<S; i++) \
for (u64 v=X[i]; v; v&=v-1) R[j++] = i*64 + CTZ(v); \
} while (0)
extern B rt_slash;
B slash_c1(B t, B x) {
if (RARE(isAtm(x)) || RARE(RNK(x)!=1)) thrF("/: Argument must have rank 1 (%H ≡ ≢𝕩)", x);
@ -128,30 +133,48 @@ B slash_c1(B t, B x) {
u64* xp = bitarr_ptr(x);
// Sparse method with CTZ
#if SINGELI && defined(__BMI2__)
if (xia>128 && s < xia/8+(xia<=32768?xia/4:0)) {
if (xia>128 && xia<=32768 && s < xia/16) {
#else
if (xia<=128 || s < xia/2+(xia<=32768?xia/4:0)) {
#endif
usz q=xia%64; if (q) xp[xia/64] &= ((u64)1<<q) - 1;
#define WHERE(T) \
T* rp; r = m_##T##arrv(&rp, s); \
for (usz i=0, j=0; j<s; i++) \
for (u64 v=xp[i]; v; v&=v-1) rp[j++] = i*64 + CTZ(v);
if (xia<=32768) { WHERE(i16) } else { WHERE(i32) }
#define WHERE(T) T* rp; r=m_##T##arrv(&rp,s); WHERE_SPARSE(xp,rp,s);
if (0&&xia<=32768) { WHERE(i16) } else { WHERE(i32) }
#undef WHERE
} else
#if SINGELI && defined(__BMI2__)
if (xia<=128) { i8* rp = m_tyarrvO(&r, 1, s, t_i8arr , 8); bmipopc_1slash8 (xp, rp, xia); }
else if (xia<=32768) { i16* rp = m_tyarrvO(&r, 2, s, t_i16arr, 16); bmipopc_1slash16(xp, rp, xia); }
else {
usz b = 1<<12;
usz b = 1<<11;
i32* rp; r = m_i32arrv(&rp, s);
TALLOC(i16, buf, b);
i32* rq=rp; usz i=0;
for (; i+b<xia; i+=b) {
bmipopc_1slash16(xp, buf, b);
usz bs = bit_sum(xp, b);
for (usz j=0; j<bs; j++) rq[j] = i+buf[j];
usz bs = bit_sum(xp,b);
if (bs >= b/8+b/16) {
bmipopc_1slash16(xp, buf, b);
for (usz j=0; j<bs; j++) rq[j] = i+buf[j];
} else if (bs >= b/256) {
for (usz j=0; j<bs; j++) rq[j]=0;
u32 top = 1<<24;
for (usz i=0, j=0; i<b/64; i++) {
u64 u=xp[i], p;
p=(u32)u&(top-1); rq[j]+=(2*top)|p; j+=POPC(p); u>>=24;
p=(u32)u&(top-1); rq[j]+=(3*top)|p; j+=POPC(p); u>>=24;
p=(u32)u ; rq[j]+=(3*top)|p; j+=POPC(p);
}
u64 t=((u64)i<<21)-2*top;
for (usz j=0; j<bs; j++) {
t += (u32)rq[j];
rq[j] = 8*(t>>24) + CTZ((u32)t);
t &= t-1;
}
} else {
for (usz ii=i/64, j=0; j<bs; ii++) {
for (u64 v=xp[ii-i/64]; RARE(v); v&=v-1) rq[j++] = ii*64 + CTZ(v);
}
}
rq+= bs;
xp+= b/64;
}