Fast path for / with empty result, and faster non-Singeli Where
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@ -429,6 +429,7 @@ B slash_c1(B t, B x) {
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if (RARE(isAtm(x)) || RARE(RNK(x)!=1)) thrF("/: Argument must have rank 1 (%H ≡ ≢𝕩)", x);
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u64 s = usum(x);
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if (s>=USZ_MAX) thrOOM();
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if (s==0) { decG(x); return emptyIVec(); }
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usz xia = IA(x);
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if (RARE(xia>=I32_MAX)) {
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usz xia = IA(x);
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@ -471,9 +472,11 @@ B slash_c1(B t, B x) {
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if (xe==el_bit) {
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u64* xp = bitarr_ptr(x);
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while (xia>0 && !bitp_get(xp,xia-1)) xia--;
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for (u64 i = 0; i < xia; i++) {
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*rp = i;
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rp+= bitp_get(xp, i);
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u8* x8 = (u8*)xp;
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u8 q=xia%8; if (q) x8[xia/8] &= (1<<q)-1;
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for (usz i=0; i<(xia+7)/8; i++) {
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u8 v = x8[i];
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for (usz k=0; k<8; k++) { *rp=8*i+k; rp+= v&1; v>>=1; }
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}
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} else if (xe==el_i8) {
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i8* xp = i8any_ptr(x);
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