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1. RDTSC — Read Time-Stamp Counter - felixcloutier.com
felixcloutier.com
Link: https://www.felixcloutier.com/x86/rdtsc
Description: 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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2. Time Stamp Counter - Wikipedia
wikipedia.org
Link: https://en.wikipedia.org/wiki/Time_Stamp_Counter
Description: 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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3. How to count clock cycles with RDTSC in GCC x86?
stackoverflow.com
Link: https://stackoverflow.com/questions/9887839/how-to-count-clock-cycles-with-rdtsc-in-gcc-x86
Description: 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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4. __rdtsc | Microsoft Learn
microsoft.com
Link: https://learn.microsoft.com/en-us/cpp/intrinsics/rdtsc?view=msvc-170
Description: WEBAug 3, 2021 · __rdtsc | Microsoft Learn. Article. 08/03/2021. 7 contributors. Feedback. 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. unsigned __int64 __rdtsc(); Return value.
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5. linux - Getting cpu cycles using RDTSC - Stack Overflow
stackoverflow.com
Link: https://stackoverflow.com/questions/8602336/getting-cpu-cycles-using-rdtsc-why-does-the-value-of-rdtsc-always-increase
Description: 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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6. Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?
stackoverflow.com
Link: https://stackoverflow.com/questions/12631856/difference-between-rdtscp-rdtsc-memory-and-cpuid-rdtsc
Description: 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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7. Performance measurements with RDTSC - strchr.com
strchr.com
Link: https://www.strchr.com/performance_measurements_with_rdtsc
Description: 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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8. X86-assembly/Instructions/rdtsc - aldeid
aldeid.com
Link: https://www.aldeid.com/wiki/X86-assembly/Instructions/rdtsc
Description: 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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9. gcc - Assembler instruction: rdtsc - Stack Overflow
stackoverflow.com
Link: https://stackoverflow.com/questions/34810392/assembler-instruction-rdtsc
Description: WEBJan 15, 2016 · Assembler instruction: rdtsc. Asked 8 years, 3 months ago. Modified 8 years, 3 months ago. Viewed 7k times. 4. Could someone help me understand the assembler given in https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html. It goes like this: uint64_t msr; asm volatile ( "rdtsc\n\t" // Returns the time in EDX:EAX.
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10. RDTSC—Read Time-Stamp Counter - GitHub Pages
github.io
Link: https://hjlebbink.github.io/x86doc/html/RDTSC.html
Description: 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.