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fix: memory and other improvements

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This commit is contained in:
Daniel Hammer
2026-03-06 22:09:11 +01:00
parent d682a49c77
commit 56fea336d6
14 changed files with 445 additions and 107 deletions
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programs/include/montauk/string.h
+41 -5
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@@ -39,22 +39,58 @@ namespace montauk {
inline void memcpy(void* dst, const void* src, uint64_t n) {
auto* d = (uint8_t*)dst;
auto* s = (const uint8_t*)src;
for (uint64_t i = 0; i < n; i++) d[i] = s[i];
// Byte copy until 8-byte aligned
while (n && ((uint64_t)d & 7)) { *d++ = *s++; n--; }
// Bulk 8-byte copy
auto* d8 = (uint64_t*)d;
auto* s8 = (const uint64_t*)s;
uint64_t words = n / 8;
for (uint64_t i = 0; i < words; i++) d8[i] = s8[i];
// Remainder
d = (uint8_t*)(d8 + words);
s = (const uint8_t*)(s8 + words);
for (uint64_t i = 0; i < (n & 7); i++) d[i] = s[i];
}
inline void memmove(void* dst, const void* src, uint64_t n) {
auto* d = (uint8_t*)dst;
auto* s = (const uint8_t*)src;
if (d < s) {
for (uint64_t i = 0; i < n; i++) d[i] = s[i];
if (d < s || d >= s + n) {
memcpy(dst, src, n);
} else {
for (uint64_t i = n; i > 0; i--) d[i-1] = s[i-1];
// Backward copy — bulk 8 bytes at a time from end
d += n; s += n;
while (n && ((uint64_t)d & 7)) { *--d = *--s; n--; }
auto* d8 = (uint64_t*)d;
auto* s8 = (const uint64_t*)s;
uint64_t words = n / 8;
for (uint64_t i = 1; i <= words; i++) d8[-i] = s8[-i];
d = (uint8_t*)(d8 - words);
s = (const uint8_t*)(s8 - words);
for (uint64_t i = 1; i <= (n & 7); i++) d[-i] = s[-i];
}
}
inline void memset(void* dst, int val, uint64_t n) {
auto* d = (uint8_t*)dst;
for (uint64_t i = 0; i < n; i++) d[i] = (uint8_t)val;
uint8_t v = (uint8_t)val;
// Byte fill until 8-byte aligned
while (n && ((uint64_t)d & 7)) { *d++ = v; n--; }
// Bulk 8-byte fill
uint64_t v8 = v;
v8 |= v8 << 8; v8 |= v8 << 16; v8 |= v8 << 32;
auto* d8 = (uint64_t*)d;
uint64_t words = n / 8;
for (uint64_t i = 0; i < words; i++) d8[i] = v8;
// Remainder
d = (uint8_t*)(d8 + words);
for (uint64_t i = 0; i < (n & 7); i++) d[i] = v;
}
inline void strcpy(char* dst, const char* src) {