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Read time from timer register on arm64.

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On ODROID C2 this change improves timer resolution from 250 ns to 41 ns.
This commit is contained in:
Bartosz Taudul 2018-04-26 16:03:31 +02:00
parent 3a20104882
commit 1899066e36
1 changed files with 15 additions and 2 deletions
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17
client/TracyProfiler.hpp
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@ -23,6 +23,10 @@
# define TRACY_HW_TIMER
#endif
#if defined __aarch64__
# define TRACY_HW_TIMER
#endif
namespace tracy
{
@ -64,7 +68,12 @@ public:
static tracy_force_inline int64_t GetTime( uint32_t& cpu )
{
#ifdef TRACY_HW_TIMER
# if defined _MSC_VER || defined __CYGWIN__
# if defined __aarch64__
int64_t t;
cpu = 0xFFFFFFFF;
asm volatile ( "mrs %0, cntvct_el0" : "=r" (t) );
return t;
# elif defined _MSC_VER || defined __CYGWIN__
const auto t = int64_t( __rdtscp( &cpu ) );
return t;
# elif defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64
@ -81,7 +90,11 @@ public:
static tracy_force_inline int64_t GetTime()
{
#ifdef TRACY_HW_TIMER
# if defined _MSC_VER || defined __CYGWIN__
# if defined __aarch64__
int64_t t;
asm volatile ( "mrs %0, cntvct_el0" : "=r" (t) );
return t;
# elif defined _MSC_VER || defined __CYGWIN__
static unsigned int dontcare;
const auto t = int64_t( __rdtscp( &dontcare ) );
return t;