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// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
#include <stdarg.h>
#include <stdint.h>
extern long time();
extern long insn();
#ifdef USE_MYSTDLIB
extern char *malloc();
extern int printf(const char *format, ...);
extern void *memcpy(void *dest, const void *src, long n);
extern char *strcpy(char *dest, const char *src);
extern int strcmp(const char *s1, const char *s2);
char heap_memory[1024];
int heap_memory_used = 0;
#endif
long time()
{
int cycles;
asm volatile ("rdcycle %0" : "=r"(cycles));
// printf("[time() -> %d]", cycles);
return cycles;
}
long insn()
{
int insns;
asm volatile ("rdinstret %0" : "=r"(insns));
// printf("[insn() -> %d]", insns);
return insns;
}
#ifdef USE_MYSTDLIB
char *malloc(int size)
{
char *p = heap_memory + heap_memory_used;
// printf("[malloc(%d) -> %d (%d..%d)]", size, (int)p, heap_memory_used, heap_memory_used + size);
heap_memory_used += size;
if (heap_memory_used > 1024)
asm volatile ("ebreak");
return p;
}
static void printf_c(int c)
{
*((volatile int*)0x10000000) = c;
}
static void printf_s(char *p)
{
while (*p)
*((volatile int*)0x10000000) = *(p++);
}
static void printf_d(int val)
{
char buffer[32];
char *p = buffer;
if (val < 0) {
printf_c('-');
val = -val;
}
while (val || p == buffer) {
*(p++) = '0' + val % 10;
val = val / 10;
}
while (p != buffer)
printf_c(*(--p));
}
int printf(const char *format, ...)
{
int i;
va_list ap;
va_start(ap, format);
for (i = 0; format[i]; i++)
if (format[i] == '%') {
while (format[++i]) {
if (format[i] == 'c') {
printf_c(va_arg(ap,int));
break;
}
if (format[i] == 's') {
printf_s(va_arg(ap,char*));
break;
}
if (format[i] == 'd') {
printf_d(va_arg(ap,int));
break;
}
}
} else
printf_c(format[i]);
va_end(ap);
}
void *memcpy(void *aa, const void *bb, long n)
{
// printf("**MEMCPY**\n");
char *a = aa;
const char *b = bb;
while (n--) *(a++) = *(b++);
return aa;
}
char *strcpy(char* dst, const char* src)
{
char *r = dst;
while ((((uint32_t)dst | (uint32_t)src) & 3) != 0)
{
char c = *(src++);
*(dst++) = c;
if (!c) return r;
}
while (1)
{
uint32_t v = *(uint32_t*)src;
if (__builtin_expect((((v) - 0x01010101UL) & ~(v) & 0x80808080UL), 0))
{
dst[0] = v & 0xff;
if ((v & 0xff) == 0)
return r;
v = v >> 8;
dst[1] = v & 0xff;
if ((v & 0xff) == 0)
return r;
v = v >> 8;
dst[2] = v & 0xff;
if ((v & 0xff) == 0)
return r;
v = v >> 8;
dst[3] = v & 0xff;
return r;
}
*(uint32_t*)dst = v;
src += 4;
dst += 4;
}
}
int strcmp(const char *s1, const char *s2)
{
while ((((uint32_t)s1 | (uint32_t)s2) & 3) != 0)
{
char c1 = *(s1++);
char c2 = *(s2++);
if (c1 != c2)
return c1 < c2 ? -1 : +1;
else if (!c1)
return 0;
}
while (1)
{
uint32_t v1 = *(uint32_t*)s1;
uint32_t v2 = *(uint32_t*)s2;
if (__builtin_expect(v1 != v2, 0))
{
char c1, c2;
c1 = v1 & 0xff, c2 = v2 & 0xff;
if (c1 != c2) return c1 < c2 ? -1 : +1;
if (!c1) return 0;
v1 = v1 >> 8, v2 = v2 >> 8;
c1 = v1 & 0xff, c2 = v2 & 0xff;
if (c1 != c2) return c1 < c2 ? -1 : +1;
if (!c1) return 0;
v1 = v1 >> 8, v2 = v2 >> 8;
c1 = v1 & 0xff, c2 = v2 & 0xff;
if (c1 != c2) return c1 < c2 ? -1 : +1;
if (!c1) return 0;
v1 = v1 >> 8, v2 = v2 >> 8;
c1 = v1 & 0xff, c2 = v2 & 0xff;
if (c1 != c2) return c1 < c2 ? -1 : +1;
return 0;
}
if (__builtin_expect((((v1) - 0x01010101UL) & ~(v1) & 0x80808080UL), 0))
return 0;
s1 += 4;
s2 += 4;
}
}
#endif
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