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#+private
package slice
import "base:builtin"
import "base:intrinsics"
_ :: intrinsics
ORD :: intrinsics.type_is_ordered
Sort_Kind :: enum {
Ordered,
Less,
Cmp,
}
_stable_sort_general :: proc(data: $T/[]$E, call: $P, $KIND: Sort_Kind) where (ORD(E) && KIND == .Ordered) || (KIND != .Ordered) #no_bounds_check {
less :: #force_inline proc(a, b: E, call: P) -> bool {
when KIND == .Ordered {
return a < b
} else when KIND == .Less {
return call(a, b)
} else when KIND == .Cmp {
return call(a, b) == .Less
} else {
#panic("unhandled Sort_Kind")
}
}
// insertion sort
// TODO(bill): use a different algorithm as insertion sort is O(n^2)
n := len(data)
for i in 1..<n {
for j := i; j > 0 && less(data[j], data[j-1], call); j -= 1 {
swap(data, j, j-1)
}
}
}
@(private)
_smoothsort :: proc(base: [^]byte, nel: uint, width: uint, cmp: Generic_Cmp, arg: rawptr) {
pntz :: proc "contextless" (p: [2]uint) -> int {
r := intrinsics.count_trailing_zeros(p[0] - 1)
if r != 0 {
return int(r)
}
r = (8*size_of(uint) + intrinsics.count_trailing_zeros(p[1]))
if r != 8*size_of(uint) {
return int(r)
}
return 0
}
shl :: proc "contextless" (p: []uint, n: int) {
n := n
if n >= 8*size_of(uint) {
n -= 8*size_of(uint)
p[1] = p[0]
p[0] = 0
}
p[1] <<= uint(n)
p[0] |= p[0] >> uint(8*size_of(uint) - n)
p[0] <<= uint(n)
}
shr :: proc "contextless" (p: []uint, n: int) {
n := n
if n >= 8*size_of(uint) {
n -= 8*size_of(uint)
p[0] = p[1]
p[1] = 0
}
p[0] >>= uint(n)
p[0] |= p[1] << uint(8*size_of(uint) - n)
p[1] >>= uint(n)
}
cycle :: proc "contextless" (width: uint, data: [][^]byte, n: int) {
if len(data) < 2 {
return
}
buf: [256]u8 = ---
data[n] = raw_data(buf[:])
width := width
for width != 0 {
l := builtin.min(size_of(buf), int(width))
copy(data[n][:l], data[0][:l])
for i in 0..<n {
copy(data[i][:l], data[i+1][:l])
data[i] = data[i][l:]
}
width -= uint(l)
}
}
sift :: proc(head: [^]byte, width: uint, cmp: Generic_Cmp, arg: rawptr, pshift: int, lp: []uint) {
head := head
buf: [14*size_of(uint)+1][^]byte = ---
buf[0] = head
i := 1
pshift := pshift
for pshift > 1 {
rt := head[-width:]
lf := head[-width:][-lp[pshift - 2]:]
if cmp(buf[0], lf, arg) >= .Equal && cmp(buf[0], rt, arg) >= .Equal {
break
}
if cmp(lf, rt, arg) >= .Equal {
buf[i], head = lf, lf
pshift -= 1
} else {
buf[i], head = rt, rt
pshift -= 2
}
i += 1
}
cycle(width, buf[:], i)
}
trinkle :: proc(head: [^]byte, width: uint, cmp: Generic_Cmp, arg: rawptr, pp: []uint, pshift: int, trusty: bool, lp: []uint) {
head := head
p := [2]uint{pp[0], pp[1]}
buf: [14*size_of(uint)+1][^]byte = ---
buf[0] = head
i := 1
trail := 0
pshift := pshift
trusty := trusty
for p[0] != 1 || p[1] != 0 {
stepson := head[-lp[pshift]:]
if cmp(stepson, buf[0], arg) <= .Equal {
break
}
if !trusty && pshift > 1 {
rt := head[-width:]
lf := head[-width:][-lp[pshift-2]:]
if cmp(rt, stepson, arg) >= .Equal || cmp(lf, stepson, arg) >= .Equal {
break
}
}
buf[i] = stepson
head = stepson
trail = pntz(p)
shr(p[:], trail)
pshift += trail
trusty = false
i += 1
}
if trusty {
return
}
cycle(width, buf[:], i)
sift(head, width, cmp, arg, pshift, lp)
}
size := nel * width
if size == 0 {
return
}
lp: [12*size_of(uint)]uint = ---
lp[1] = width
lp[0] = lp[1]
for i := 2; true; i += 1 {
lp[i] = lp[i-2] + lp[i-1] + width
if lp[i] >= size {
break
}
}
head := base
high := head[size - width:]
p := [2]uint{1, 0}
pshift := 1
for head < high {
if (p[0] & 3) == 3 {
sift(head, width, cmp, arg, pshift, lp[:])
shr(p[:], 2)
pshift += 2
} else {
if lp[pshift - 1] >= uint(uintptr(high) - uintptr(head)) {
trinkle(head, width, cmp, arg, p[:], pshift, false, lp[:])
} else {
sift(head, width, cmp, arg, pshift, lp[:])
}
if pshift == 1 {
shl(p[:], 1)
pshift = 0
} else {
shl(p[:], pshift - 1)
pshift = 1
}
}
p[0] |= 1
head = head[width:]
}
trinkle(head, width, cmp, arg, p[:], pshift, false, lp[:])
for pshift != 1 || p[0] != 1 || p[1] != 0 {
if pshift <= 1 {
trail := pntz(p)
shr(p[:], trail)
pshift += trail
} else {
shl(p[:], 2)
pshift -= 2
p[0] ~= 7
shr(p[:], 1)
trinkle(head[-width:][-lp[pshift]:], width, cmp, arg, p[:], pshift + 1, true, lp[:])
shl(p[:], 1)
p[0] |= 1
trinkle(head[-width:], width, cmp, arg, p[:], pshift, true, lp[:])
}
head = head[-width:]
}
}
|
