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Use 64-bit integers inside Stopwatch to enable longer timings.

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This commit is contained in:
Andreas Kling 2019-03-21 13:36:40 +01:00
parent 0114c61cf1
commit 9dfcd95cd7
5 changed files with 155 additions and 25 deletions
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75
AK/StdLibExtras.cpp
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@ -3,6 +3,8 @@
#include <AK/Types.h>
#include <AK/kstdio.h>
extern "C" {
void* mmx_memcpy(void* dest, const void* src, size_t len)
{
ASSERT(len >= 1024);
@ -49,3 +51,76 @@ void* mmx_memcpy(void* dest, const void* src, size_t len)
memcpy(dest_ptr, src_ptr, len);
return dest;
}
static inline uint32_t divq(uint64_t n, uint32_t d)
{
uint32_t n1 = n >> 32;
uint32_t n0 = n;
uint32_t q;
uint32_t r;
asm volatile("divl %4" : "=d"(r), "=a"(q) : "0"(n1), "1"(n0), "rm"(d));
return q;
}
static uint64_t unsigned_divide64(uint64_t n, uint64_t d)
{
if ((d >> 32) == 0) {
uint64_t b = 1ULL << 32;
uint32_t n1 = n >> 32;
uint32_t n0 = n;
uint32_t d0 = d;
return divq(b * (n1 % d0) + n0, d0) + b * (n1 / d0);
}
if (n < d)
return 0;
uint32_t d1 = d >> 32u;
int s = __builtin_clz(d1);
uint64_t q = divq(n >> 1, (d << s) >> 32) >> (31 - s);
return n - (q - 1) * d < d ? q - 1 : q;
}
static uint32_t unsigned_modulo64(uint64_t n, uint64_t d)
{
return n - d * unsigned_divide64(n, d);
}
static int64_t signed_divide64(int64_t n, int64_t d)
{
uint64_t n_abs = n >= 0 ? (uint64_t)n : -(uint64_t)n;
uint64_t d_abs = d >= 0 ? (uint64_t)d : -(uint64_t)d;
uint64_t q_abs = unsigned_divide64(n_abs, d_abs);
return (n < 0) == (d < 0) ? (int64_t)q_abs : -(int64_t)q_abs;
}
static int32_t signed_modulo64(int64_t n, int64_t d)
{
return n - d * signed_divide64(n, d);
}
int64_t __divdi3(int64_t n, int64_t d)
{
return signed_divide64 (n, d);
}
int64_t __moddi3(int64_t n, int64_t d)
{
return signed_modulo64(n, d);
}
uint64_t __udivdi3(uint64_t n, uint64_t d)
{
return unsigned_divide64(n, d);
}
uint64_t __umoddi3(uint64_t n, uint64_t d)
{
return unsigned_modulo64(n, d);
}
uint64_t __udivmoddi4(uint64_t n, uint64_t d, uint64_t* r)
{
*r = unsigned_modulo64(n, d);
return unsigned_divide64(n, d);
}
}