__rdtscp | Microsoft Learn
ウェブ2024年1月22日 · Learn. C++、C、およびアセンブラー. __rdtscp. [アーティクル] 2024/01/22. 7 人の共同作成者. フィードバック. この記事の内容. 構文. 戻り値. 要件. 解説. さらに 2 個を表示. Microsoft 固有の仕様. 命令を rdtscp 生成し、メモリに書き込み TSC_AUX[31:0] 、64 ビット タイム スタンプ カウンター (TSC) の結果を返します。 …
measuring code execution times in C using RDTSC instruction
ウェブ2015年11月2日 · You can use either CPUID or RDTSCP (which is just a serializing form of RDTSC) My suggestion: just use whatever high frequency timer API your OS has. On Windows this is QueryPerformanceCounter and on …
RDTSCP — Read Time-Stamp Counter and Processor ID
ウェブRDTSCP — 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.
Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?
ウェブ2012年9月28日 · These are our options: 1: rdtscp is a serializing call. It prevents reordering around the call to rdtscp. __asm__ __volatile__("rdtscp; " // serializing read of tsc. "shl $32,%%rdx; " // shift higher 32 bits stored in rdx up. "or %%rdx,%%rax" // and or onto rax. : "=a"(tsc) // output to tsc variable.
c - RDTSCP versus RDTSC + CPUID - Stack Overflow
ウェブ2014年12月30日 · Most recently I've come across the RDTSCP* instruction, which seems to do what RDTSC+CPUID did, but more efficiently as it's a newer instruction - only a 1.5x-2x overhead, relatively. My question: Is RDTSCP truly accurate as a point of measurement, and is it the "correct" way of doing the timing?
__rdtscp | Microsoft Learn
ウェブ__rdtscp. Article. 08/02/2021. 7 contributors. Feedback. In this article. Syntax. Return value. Requirements. Remarks. Show 2 more. Microsoft Specific. Generates the rdtscp instruction, writes TSC_AUX[31:0] to memory, and returns the 64-bit Time Stamp Counter (TSC) result. Syntax. Copy. unsigned __int64 __rdtscp( unsigned int * AUX. );
__rdtsc | Microsoft Learn
ウェブ2021年8月2日 · 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. …
RDTSC — Read Time-Stamp Counter - felixcloutier.com
ウェブRDTSC — 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.
GitHub - xuwd1/rdtsc-notes: notes and example codes on ...
ウェブThe rdtscp , lfence and cpuid. For solving the above problems, some more or less serializing instructions has to be used. We have some candidates here: The rdtscp instruction, which is available all recent X86 platforms.
GitHub - fordsfords/rdtsc: Demo of rdtsc in c
ウェブThe "rdtsc_calibrate ()" function is defined in the "rdtsc.c" module. It's purpose is to set the global "rdtsc_ticks_per_sec", which can subsequently be used to convert ticks to time. The calibration sleeps for 2 milliseconds and uses "clock_gettime ()".
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