'What is the gcc cpu-type that includes support for RDTSCP?
I am using RDTSCP to replace LFENCE;RDTSC sequences and also get the processor ID back so that I know when I'm comparing TSC values after the thread was rescheduled to another CPU.
To ensure I don't run RDTSCP on a too old machine I fallback to RDTSC after a CPUID check (using libcpuid). I'd like to try using the gcc multiple target attribute functionality instead of a CPUID call:
int core2_func (void) __attribute__ ((__target__ ("arch=core2")));
The gcc manual lists a number of cpu families (haswell, skylake, ...). How would I find which cpu family first introduced RDTSCP?
Solution 1:[1]
All AMD processors since the K8 Hammer support RDTSCP.
On Intel processors, RDTSCP is supported on Nehalem and later, Silvermont and later, and Knights Landing and later.
Sources
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Source: Stack Overflow
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