Check for a small return type in large-range /⁼ with a sparse table
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@ -39,16 +39,16 @@
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// SHOULD do something for odd cell widths in Replicate
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// Indices inverse (/⁼), a lot like Group
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// COULD always give a squeezed result, sometimes expensive
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// SHOULD sort large-range 𝕩 to find minimum result type
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// Always gives a squeezed result for integer 𝕩
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// Boolean 𝕩: just count 1s
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// Long i8 and i16 𝕩: count into zeroed buffer before anything else
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// Only zero positive part; if total is too small there were negatives
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// Cutoff is set so short 𝕩 gives a result of the same type
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// Scan for strictly ascending 𝕩
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// COULD vectorize with find-compare
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// COULD find descending too
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// Unsigned maximum for integers to avoid a separate negative check
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// If (≠÷⌈´)𝕩 is small, find result type with a sparse u8 table
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// COULD use a u16 table for i32 𝕩 to detect i16 result
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#include "../core.h"
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#include "../utils/mut.h"
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@ -913,26 +913,45 @@ B slash_im(B t, B x) {
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rp[sum>0] = sum; rp[0] = xia - sum;
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r = num_squeeze(r); break;
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}
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#define IIND_INT(N) \
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if (xp[0]<0) thrM("/⁼: Argument cannot contain negative numbers"); \
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usz a=1; while (a<xia && xp[a]>xp[a-1]) a++; \
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u##N max=xp[a-1]; \
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if (a<xia) { \
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for (usz i=a; i<xia; i++) { u##N c=xp[i]; if (c>max) max=c; } \
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if ((i##N)max<0) thrM("/⁼: Argument cannot contain negative numbers"); \
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usz ria = max + 1; \
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if (xia < ria/8) { \
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u8 maxcount = 0; \
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TALLOC(u8, tab, ria); \
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for (usz i=0; i<xia; i++) tab[xp[i]]=0; \
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for (usz i=0; i<xia; i++) maxcount|=tab[xp[i]]++; \
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TFREE(tab); \
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if (maxcount==0) a=xia; \
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else if (N>=16 && maxcount<127) { \
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i8* rp; r = m_i8arrv(&rp, ria); for (usz i=0; i<ria; i++) rp[i]=0; \
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for (usz i = 0; i < xia; i++) rp[xp[i]]++; \
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break; \
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} \
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} \
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} \
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if (a==xia) { /* Unique argument */ \
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usz ria = max + 1; \
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u64* rp; r = m_bitarrv(&rp, ria); \
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for (usz i=0; i<BIT_N(ria); i++) rp[i]=0; \
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for (usz i=0; i<xia; i++) bitp_set(rp, xp[i], 1); \
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break; \
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} \
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usz ria = (usz)max + 1; \
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i##N* rp; r = m_i##N##arrv(&rp, ria); for (usz i=0; i<ria; i++) rp[i]=0; \
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for (usz i = 0; i < xia; i++) rp[xp[i]]++; \
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r = num_squeeze(r);
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#define CASE_SMALL(N) \
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case el_i##N: { \
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i##N* xp = i##N##any_ptr(x); \
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usz m=1<<N; \
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if (xia < m/2) { \
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if (xp[0]<0) thrM("/⁼: Argument cannot contain negative numbers"); \
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usz a=1; while (a<xia && xp[a]>xp[a-1]) a++; \
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u##N max=xp[a-1]; \
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if (a==xia) { /* Sorted unique argument */ \
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usz ria = max + 1; \
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u64* rp; r = m_bitarrv(&rp, ria); \
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for (usz i=0; i<BIT_N(ria); i++) rp[i]=0; \
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for (usz i=0; i<xia; i++) bitp_set(rp, xp[i], 1); \
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break; \
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} \
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for (usz i=a; i<xia; i++) { u##N c=xp[i]; if (c>max) max=c; } \
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if ((i##N)max<0) thrM("/⁼: Argument cannot contain negative numbers"); \
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usz ria = max+1; \
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i##N* rp; r = m_i##N##arrv(&rp, ria); for (usz i=0; i<ria; i++) rp[i]=0; \
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for (usz i = 0; i < xia; i++) rp[xp[i]]++; \
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IIND_INT(N) \
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} else { \
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TALLOC(usz, t, m); \
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for (usz j=0; j<m/2; j++) t[j]=0; \
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@ -941,26 +960,14 @@ B slash_im(B t, B x) {
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if (ria>m/2) thrM("/⁼: Argument cannot contain negative numbers"); \
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i32* rp; r = m_i32arrv(&rp, ria); for (usz i=0; i<ria; i++) rp[i]=t[i]; \
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TFREE(t); \
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r = num_squeeze(r); \
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} \
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r = num_squeeze(r); break; \
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break; \
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}
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CASE_SMALL(8) CASE_SMALL(16)
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#undef CASE_SMALL
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case el_i32: {
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i32* xp = i32any_ptr(x);
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usz i,j; i32 max=-1;
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for (i = 0; i < xia; i++) { i32 c=xp[i]; if (c<=max) break; max=c; }
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for (j = i; j < xia; j++) { i32 c=xp[j]; max=c>max?c:max; if (c<0) thrM("/⁼: Argument cannot contain negative numbers"); }
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usz ria = max+1;
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if (i==xia) {
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u64* rp; r = m_bitarrv(&rp, ria); for (usz i=0; i<BIT_N(ria); i++) rp[i]=0;
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for (usz i = 0; i < xia; i++) bitp_set(rp, xp[i], 1);
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} else {
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i32* rp; r = m_i32arrv(&rp, ria); for (usz i=0; i<ria; i++) rp[i]=0;
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for (usz i = 0; i < xia; i++) rp[xp[i]]++;
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}
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break;
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}
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case el_i32: { i32* xp = i32any_ptr(x); IIND_INT(32) r = num_squeeze(r); break; }
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#undef IIND_INT
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case el_f64: {
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f64* xp = f64any_ptr(x);
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usz i,j; f64 max=-1;
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