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CMU CS 15213 - Exam

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Slide 1Agenda[Subset of] What to Know[Subset of] What to KnowFloating Point ReviewSlide 6Round-to-even examplesArray AccessSlide 9StructsSlide 11Exam #1 ReviewBy sseshadrAgenda•Reminders–Test tomorrow!•One 8.5 x 11 sheet, two sides–Pick up your datalabs in OH–Cachelab comes out tomorrow•Review•Questions[Subset of] What to Know•Labs!–We try to reward people who did them well•Assembly–Basics (what does cmp do, source vs. dest, operand order for add, etc.)?–What registers are special? Caller save vs. callee save?–Switch statements and jump tables?–Loops?–You should be able to trace through assembly. Practice it.–You should be able to write small amounts of assembly (like buflab).•Data Representation–Two’s compliment–Floating point–Endianness[Subset of] What to Know•Stack–What’s different in 32- vs. 64-bit–You should know parameters, ebp values, return address, etc.•Larger Structures–Structs and Unions•What’s the difference?•Padding and alignment–Arrays•Multi-dimensional access•Control–Loops in assembly?–Recursion?•Memory–Heap vs. Stack–What is the L1 Cache?Floating Point Review•Basics–Sign, Mantissa, Exponent–Round to even–Bias–Infinity, +- zero, NaN–Normalized vs. Denormalized10010 111110 11100 15100 10101 10000 101 13/456Infinity111 000001/128 01000 000 1/128Round-to-even examples•Represent 25/64 with 4 exponent bits, 3 fraction bits. Bias is 2(4-1) – 1 = 7–0101 100: Rounded DOWN to value 3/8•Represent 27/64 with 4 exponent bits, 3 fraction bits–0101 110: Rounded UP to value 7/16•Represent 51/128 with 4 exponent bits, 3 fraction bits–0101 101: Rounded UP to value 13/32–Didn’t use round-to-even on this… it wasn’t a “tie”Array Access•Start with the C code•Then look at the assembly–Work backwards!•Easiest to just do an example*(array2 + yH + x)Remember though, multiply the offset by sizeof(int)*(array1 + xJ + y)rdx must have value Hy +xrax must have value Jx +yrax == xrdx == 3yrax == 32xrax == 31xrdx == 6y+xrax == 31x + yStructs•What is a union again?•How big are things?–If you can’t remember, cheat sheet.–int, char, pointer (you should know these by now)–float, double, short•Alignment rules–If you can’t remember, cheat sheet.aaaa bbxx ccccccccdxxxeeee fxxx gggghhhhAre we


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CMU CS 15213 - Exam

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