-rw-r--r-- 557 libcpucycles-20230105/cpucycles/ppc64-mftb.c raw
// version 20230105 // public domain // djb // adapted from supercop/cpucycles/powerpccpuinfo.c #include "cpucycles_internal.h" long long ticks(void) { unsigned int high, low, newhigh; unsigned long long result; do { asm volatile( "mftbu %0; mftb %1; mftbu %2" : "=r" (high), "=r" (low), "=r" (newhigh) ); } while (newhigh != high); result = high; result <<= 32; result |= low; return result; } long long ticks_setup(void) { if (!cpucycles_works(ticks)) return cpucycles_SKIP; return cpucycles_FINDMULTIPLIER; }