What is Y86 assembly?
Y86 is an assembly language instruction set simpler than but. similar to IA32; but not as compact (as we will see) The Y86 has: 8 32-bit registers with the same names as the IA32 32-bit registers. 3 condition codes: ZF, SF, OF.
How many registers are there in Y86?
Each address in memory stores a full 32-bit word of data. Y86 has a small memory (256 32-bit words)….Registers and Memory.
What Y86 64?
The Y86-64 processor is a simple Instruction Set Architecture based on x86-64. Fewer data types, instructions, and addressing modes. Simple byte-level encoding. ISA sufficiently complete to write programs that manipulate integer data.
What is programmer visible state?
As Figure 4.1 illustrates, each instruction in a Y86 program can read and modify some part of the processor state. This is referred to as the programmer-visible state, where the “programmer” in this case is either someone writing programs in assembly code or a compiler generating machine-level code.
What is RAX register?
rax is the 64-bit, “long” size register. It was added in 2003 during the transition to 64-bit processors. eax is the 32-bit, “int” size register. It was added in 1985 during the transition to 32-bit processors with the 80386 CPU.
What is Pushq Assembly?
A push instruction pushes a value onto the stack. This both modifies the stack pointer (making it smaller) and modifies the stack segment (by moving data there). For instance, the instruction pushq X means: subq $8, %rsp movq X, (%rsp) And popq X undoes the effect of pushq X .
Which is the fastest memory?
Cache memory is the fastest system memory, required to keep up with the CPU as it fetches and executes instructions. The data most frequently used by the CPU is stored in cache memory.
What is CPU architecture in computer?
A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions.
How many instructions does x86 have?
According to Intel’s XED, as of this writing, there are 1503 defined x86 instructions (“iclasses” in XED lingo), from AAA to XTEST (this includes AMD-specific extensions too, by the way).
What is RDI and RSI?
rsi – register source index (source for data copies) rdi – register destination index (destination for data copies)