By Sivarama P. Dandamudi
Information RISC layout ideas in addition to explains the variations among this and different designs.
Helps readers gather hands-on meeting language programming adventure
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Info RISC layout ideas in addition to explains the variations among this and different designs.
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Additional info for Guide to RISC Processors: for Programmers and Engineers
When an instruction is fetched, the PC is automatically incremented to point to the next instruction. If we assume that each instruction takes exactly four bytes as in MIPS and SPARC processors, the PC is automatically incremented by four after each instruction fetch. This leads to the default sequential execution pattern. However, sometimes we want to alter this default execution ﬂow. In high-level languages, we use control structures such as if-then-else and while statements to alter the execution behavior based on some run-time conditions.
Often, the same instruction is used to load operands of different sizes. For example, the IA-32 instruction mov AL,address ; Loads an 8-bit value loads the AL register with an 8-bit value from memory at address. The same instruction can also be used to load 16- and 32-bit values as shown in the following two instructions. mov mov AX,address EAX,address ; Loads a 16-bit value ; Loads a 32-bit value In these instructions, the size of the operand is indirectly given by the size of the register used.
First, it causes variable instruction execution times, depending on the location of the operands. Second, it leads to variable-length instructions. For example, the IA-32 instruction length can range from 1 to 12 bytes. Variable instruction lengths lead to inefﬁcient instruction decoding and scheduling. Large Register Set Several researchers have studied the characteristics of procedure calls in HLLs. We quote two studies—one by Patterson and Sequin  and the other by Tanenbaum . Several other studies, in fact, support the ﬁndings of these two studies.
Guide to RISC Processors: for Programmers and Engineers by Sivarama P. Dandamudi