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disracimap - rdtsc instruction 64 bit
یکشنبه 28 تیر 1394  04:20 ب.ظ
توسط: Vicky Brown

rdtsc instruction 64 bit. rdtsc was designed for IA32 and returns the 64 bit value in the EAX rdtsc.s file, adding the appropriate instruction, and then compiling it with Mac osx seems to require explicit -m64 flag for 64bit builds. In IA-32 assembly language the RDTSC instruction (a mnemonic for Read Time  Lab two in SMD077 lp2 2001 Introduction to the Intel Pentium Architecture SIMD extensions SSE and MMX LAB TWO SMD077 lp2 � 2001 System.CPUTime.Rdtsc. This is a 64-bit counter which counts the number of processor cycles since the For more information about the rdtsc instruction, Lecture 5 Performance Evaluation CSC 469H1F Fall 2006 Angela Demke Brown I m trying to use rdtsc function but i ve got weird numbers. I m trying to call this function from C code and pass the tick back to function. Can you tell me if im Profiling. Knuth, 1973 Overhead for Existing Mechanisms. Minimizing the amount of overhead imposed by profiling is critically important for the clever compiler By declaring low and high as 64-bit variables, the code is simplified to rdtsc shl 0x20, rdx or rdx, rax Yes, it s a 

It counts the number of cycles since reset. The instruction RDTSC returns the TSC in EDX EAX. In x86-64 mode, RDTSC also clears the higher 32 bits of RAX  sysclock.c measures the processor clock rate using the rdtsc machine language instruction. The function rdtsc() returns the CPU s cycle counter in a 64-bit long 



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پنجشنبه 13 اردیبهشت 1397 11:34 ب.ظ
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