The Time Stamp Counter (TSC) is a 64-bit register present on all x86 processors since the Pentium. 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. Its opcode is 0F 31. Pentium competitors such as the Cyrix 6x86 did not always have a TSC and may consider RDTSC an illegal instruction. Cyrix included a Time Stamp Counter in their MII.
Read more about Time Stamp Counter: Use, Implementation in Various Processors, Operating System Support, Other Architectures
Famous quotes containing the words time, stamp and/or counter:
“It is time that the Protestant Church, the Church of the Son, should be one again with the Roman Catholic Church, the Church of the Father. It is time that man shall cease, first to live in the flesh, with joy, and then, unsatisfied, to renounce and to mortify the flesh.”
—D.H. (David Herbert)
“The man whose action habitually bears the stamp of his mind is a genius, but the greatest genius is not always equal to himself, or he would cease to be human.”
—Honoré De Balzac (1799–1850)
“As deaths have accumulated I have begun to think of life and death as a set of balance scales. When one is young, the scale is heavily tipped toward the living. With the first death, the first consciousness of death, the counter scale begins to fall. Death by death, the scales shift weight until what was unthinkable becomes merely a matter of gravity and the fall into death becomes an easy step.”
—Alison Hawthorne Deming (b. 1946)