Computers and Technology, 28.02.2020 01:50, tamera62
Computers spend most of their time in loops, so multiple loop itera- tions are great places to speculatively find more work to keep CPU resources busy. Nothing is ever easy, though: the compiler emitted only one copy of that loop's code, so even though multiple iterations are handling distinct data, they will appear to use the same registers. To keep multiple iterations' register usages from colliding, we rename their registers. Figure 3.49 shows example code that we would like our hardware to rename. A compiler could have simply unrolled the loop and used different registers to avoid conflicts, but if we expect our hard- ware to unroll the loop, it must also do the register renaming. How? Assume your hardware has a pool of temporary registers (call them T registers, and assume that there are 64 of them, TO through T63) that it can substitute for those registers des- ignated by the compiler. This rename hardware is indexed by the src (source) register designation, and the value in the table is the T register of the last destina- tion that targeted that register. (Think of these table values as producers, and the src registers are the consumers; it doesn't much matter where the producer puts its result as long as its consumers can find it.) Consider the code sequence in Fig ure 3.49. Every time you see a destination register in the code, substitute the next available T, beginning with T9. Then update all the src registers accordingly, so that true data dependences are maintained. Show the resulting code. (Hint: See Figure 3.50.)
Answers: 1
Computers and Technology, 21.06.2019 16:30, jor66
You have inserted new slides based on a word outline. how do you format these new slides to match the powerpoint presentation formatting? a. select all slides in the presentation and click format on the home tab. b. select the new slides and click reset on the home tab. c. select all slides in the presentation and click reset on the home tab. d. select the new slides and click format on the home tab.
Answers: 2
Computers and Technology, 22.06.2019 12:00, dani19cano
The following function returns a string of length n whose characters are all 'x'. give the order of growth (as a function of n) of the running time. recall that concatenating two strings in java takes time proportional to the sum of their lengths. public static string f(int n) { if (n == 0) return ""; if (n == 1) return "x"; return f(n/2) + f(n - n/2); } options: a) constant b) logarithmic c) linear d) linearithmic e)quadratic f)cubic g) exponential
Answers: 2
Computers and Technology, 23.06.2019 09:30, cdavis379
:you areto design the controller for alight that functions both as an ordinary light and also as a motion activated light and alarm. a. if the manual switch s is on, then the light l is on. b. besides the manual switch, there is a motion detector, m1, which activatesthis light. c.if motion is detected but the light is on anyway because s is on, only then a secondoutput a, an alarm, is turned on. d. the disable switch, d, disables the motion activated light and alarmbut leaves manual control operation of the light using switch s.(i)read the problem statement and clearly identify the inputs and outputs for the circuit you are designing. (ii)create the truth table for this system; include the light, alarm, switch, disable, and the motion sensor.(iii)draw a schematic of this system.
Answers: 1
Computers spend most of their time in loops, so multiple loop itera- tions are great places to specu...
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Chemistry, 27.07.2019 16:00
Health, 27.07.2019 16:00