rdtsc | How to count clock cycles with RDTSC in GCC x86?

Keyword	CPC	PCC	Volume	Score	Length of keyword
rdtsc	1.33	0.4	3902	10	5

Keyword	CPC	PCC	Volume	Score
rdtsc	0.09	0.3	956	78
rdtscp	1.3	0.2	4466	74
rdtsc instruction	0.78	0.9	4387	34
rdtsc linux	1.14	0.2	1781	53
rdtsc arm	1.47	0.1	2547	14
rdtsc x86	0.87	0.2	5083	87
rdtsc c++	0.73	0.3	4470	58
rdtscll	1.52	0.6	9753	8
rdtscp trick	0.6	0.1	1900	49
rdtsc to nanoseconds	1.86	0.1	7719	8

Search Results related to rdtsc on Search Engine

How to count clock cycles with RDTSC in GCC x86?
stackoverflow.com

https://stackoverflow.com/questions/9887839/how-to-count-clock-cycles-with-rdtsc-in-gcc-x86

WebHow to get the CPU cycle count in x86_64 from C++? (5 answers) Closed 5 years ago. With Visual Studio I can read the clock cycle count from the processor as shown below. How do I do the same thing with GCC? #ifdef _MSC_VER // Compiler: Microsoft Visual Studio. #ifdef _M_IX86 // Processor: x86.

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__rdtsc | Microsoft Learn
microsoft.com

https://learn.microsoft.com/en-us/cpp/intrinsics/rdtsc?view=msvc-170

WebAug 2, 2021 · Requirements. Remarks. Show 2 more. Microsoft Specific. Generates the rdtsc instruction, which returns the processor time stamp. The processor time stamp records the number of clock cycles since the last reset. Syntax. Copy. unsigned __int64 __rdtsc(); Return value. A 64-bit unsigned integer representing a tick count. …

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RDTSC — Read Time-Stamp Counter - felixcloutier.com
felixcloutier.com

https://www.felixcloutier.com/x86/rdtsc

WebRDTSC — Read Time-Stamp Counter. Instruction Operand Encoding ¶. Description ¶. Reads the current value of the processor’s time-stamp counter (a 64-bit MSR) into the EDX:EAX registers. The EDX register is loaded with the high-order 32 bits of the MSR and the EAX register is loaded with the low-order 32 bits.

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Time Stamp Counter - Wikipedia
wikipedia.org

https://en.wikipedia.org/wiki/Time_Stamp_Counter

WebThe Time Stamp Counter ( TSC) is a 64-bit register present on all x86 processors since the Pentium. It counts the number of CPU cycles since its reset. The instruction RDTSC returns the TSC in EDX:EAX. In x86-64 mode, RDTSC also clears the upper 32 bits of RAX and RDX. Its opcode is 0F 31. [1] .

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Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?
stackoverflow.com

https://stackoverflow.com/questions/12631856/difference-between-rdtscp-rdtsc-memory-and-cpuid-rdtsc

WebSep 28, 2012 · : : "%rcx", "%rdx"); // rcx and rdx are clobbered. However, rdtscp is only available on newer CPUs. So in this case we have to use rdtsc. But rdtsc is non-serializing, so using it alone will not prevent the CPU from reordering it. So we can use either of these two options to prevent reordering:

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linux - Getting cpu cycles using RDTSC - Stack Overflow
stackoverflow.com

https://stackoverflow.com/questions/8602336/getting-cpu-cycles-using-rdtsc-why-does-the-value-of-rdtsc-always-increase

WebOct 21, 2016 · 20. I want to get the CPU cycles at a specific point. I use this function at that point: static __inline__ unsigned long long rdtsc(void) { unsigned long long int x; __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x)); // broken for 64-bit builds; don't copy this code. return x; } (editor's note: "=A" is wrong for x86-64; it picks either RDX or RAX.

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Performance measurements with RDTSC - strchr.com
strchr.com

https://www.strchr.com/performance_measurements_with_rdtsc

WebThe RDTSC instruction returns a 64-bit time stamp counter (TSC), which is increased on every clock cycle. It's the most precise counter available on x86 architecture. MSVC++ 2005 compiler supports a handy __rdtsc intrinsic that returns the result in 64-bit variable.

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X86-assembly/Instructions/rdtsc - aldeid
aldeid.com

https://www.aldeid.com/wiki/X86-assembly/Instructions/rdtsc

WebNov 29, 2015 · The rdtsc (Read Time-Stamp Counter) instruction is used to determine how many CPU ticks took place since the processor was reset. Loads the current value of the processor's time-stamp counter into the EDX:EAX registers. It is commonly used as a timing defense (anti-debugging technique). Opcode. 0F 31. Flags affected. None. Example.

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RDTSCP — Read Time-Stamp Counter and Processor ID
felixcloutier.com

https://www.felixcloutier.com/x86/rdtscp

WebRDTSCP — Read Time-Stamp Counter and Processor ID. Instruction Operand Encoding ¶. Description ¶. Reads the current value of the processor’s time-stamp counter (a 64-bit MSR) into the EDX:EAX registers and also reads the value of the IA32_TSC_AUX MSR (address C0000103H) into the ECX register.

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Using the RDTSC Instruction for Performance Monitoring
carleton.ca

https://www.ccsl.carleton.ca/~jamuir/rdtscpm1.pdf

Web1.0. Introduction. Programmers are often puzzled by the erratic performance numbers they see when using the RDTSC (read-time stamp counter) instruction to monitor performance. This erratic behavior is not an instruction flaw; the RDTSC instruction will always give back a proper cycle count.

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