15213 Study Guide - Midterm Guide: Endianness, Extended Precision, Double-Precision Floating-Point Format
13 Aug 2017
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Move: movq src, dest, takes di erent arguments immediate (e. g. ), register (e. g. (e. g. ), register (e. g. %rax), memory (8 consecutive bytes at address) (e. g. (%rax)). Pointer can arithmetic be done by, d(rb,ri,s), which computes. Load e ective address: leaq src, dest takes address mode expression and sets a register dest to hold the computation result. Arithmetic: generally, addq src, dest which does dest = dest + src. 3. 1 representation: numeric form: ( 1)sm 2e where sig- ni cant m is normally m [1. 0, 2. 0), encoded as s | exp | frac, precision options. Single precision (32 bits): 1 | 8. Extended precision (80 bits, in- tel only): 1 | 15 | 64: normalized values (exp 6= 00 . Exp is the unsigned value of exp and bias = 2k 1 1 where k is the number of exponent bits.
