diff options
Diffstat (limited to 'mysys')
| -rw-r--r-- | mysys/my_cpu.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/mysys/my_cpu.c b/mysys/my_cpu.c index cd13624df0f..dd8ff4b6a02 100644 --- a/mysys/my_cpu.c +++ b/mysys/my_cpu.c @@ -24,8 +24,15 @@ unsigned my_cpu_relax_multiplier = 200; # ifdef _MSC_VER # include <intrin.h> +# define my_timer_cycles __rdtsc +# elif !defined __x86_64__ +/* On some x86 targets, __rdtsc() causes an unresolved external symbol error, +instead of being inlined. Let us fall back to my_timer_cycles(), which +internally invokes rdtsc. */ +# include <my_rdtsc.h> # else # include <x86intrin.h> +# define my_timer_cycles __rdtsc # endif #define PAUSE4 MY_RELAX_CPU(); MY_RELAX_CPU(); MY_RELAX_CPU(); MY_RELAX_CPU() @@ -70,11 +77,11 @@ unsigned my_cpu_relax_multiplier = 200; void my_cpu_init(void) { uint64_t t0, t1, t2; - t0= __rdtsc(); + t0= my_timer_cycles(); PAUSE16; - t1= __rdtsc(); + t1= my_timer_cycles(); PAUSE16; - t2= __rdtsc(); + t2= my_timer_cycles(); if (t2 - t1 > 30 * 16 && t1 - t0 > 30 * 16) my_cpu_relax_multiplier= 20; } |