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Ported: Optimize String.repeat()

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This backports the optimization done in `master`.
- Calinou, MewPurPur
3b31ff9008
This commit is contained in:
Relintai 2022-09-16 22:08:51 +02:00
parent bce30062a5
commit dbcca5d26d
1 changed files with 12 additions and 10 deletions
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22
core/string/ustring.cpp
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@ -34,8 +34,8 @@
#include "ustring.h"
#include "core/math/color.h"
#include "core/crypto/crypto_core.h"
#include "core/math/color.h"
#include "core/math/math_funcs.h"
#include "core/os/memory.h"
#include "core/string/print_string.h"
@ -1537,17 +1537,19 @@ String String::newline_to_br() const {
String String::repeat(int p_count) const {
ERR_FAIL_COND_V_MSG(p_count < 0, "", "Parameter count should be a positive number.");
String new_string;
const CharType *src = this->get_data();
int len = length();
String new_string = *this;
new_string.resize(p_count * len + 1);
new_string.resize(length() * p_count + 1);
new_string[length() * p_count] = 0;
for (int i = 0; i < p_count; i++) {
for (int j = 0; j < length(); j++) {
new_string[i * length() + j] = src[j];
}
CharType *dst = new_string.ptrw();
int offset = 1;
int stride = 1;
while (offset < p_count) {
memcpy(dst + offset * len, dst, stride * len * sizeof(CharType));
offset += stride;
stride = MIN(stride * 2, p_count - offset);
}
dst[p_count * len] = _null;
return new_string;
}