i386 different from x86? [closed]

i386 is just one the first model in the x86 familly of processors, and instructions sets. For more informations, you might want to take a look at : Intel 80386 x86 Quoting the second page : The term x86 refers to a family of instruction set architectures[1] based on the Intel 8086. The term is … Read more

How to: pow(real, real) in x86

Just compute it as 2^(y*log2(x)). There is a x86 instruction FYL2X to compute y*log2(x) and a x86 instruction F2XM1 to do exponentiation. F2XM1 requires an argument in [-1,1] range, so you’d have to add some code in between to extract the integer part and the remainder, exponentiate the remainder, use FSCALE to scale the result … Read more

How has CPU architecture evolution affected virtual function call performance?

AMD processor in the early-gigahertz era had a 40 cycle penalty every time you called a function Huh.. so large.. There is an “Indirect branch prediction” method, which helps to predict virtual function jump, IF there was the same indirect jump some time ago. There is still a penalty for first and mispredicted virt. function … Read more

Are different mmx, sse and avx versions complementary or supersets of each other?

They are complementary. Each new instruction set extension add new instructions and eventually a new programming model (new registers for example). None are deprecated, deprecating instructions is almost impossible to do for compatibility reasons. However some optional extensions may be absent or removed from newer models (like the FMA4 of AMD) if not very wide … Read more

The difference between Call Gate, Interrupt Gate, Trap Gate?

A gate (call, interrupt, task or trap) is used to transfer control of execution across segments. Privilege level checking is done differently depending on the type of destination and instruction used. A call gate uses the CALL and JMP instructions. Call gates transfer control from lower privilege code to higher privilege code. The gate DPL … Read more

Is x86 RISC or CISC? [closed]

x86 is a CISC architecture. The number of instructions is a big factor as all cisc architectures with all more instructions. Furthermore as instructions are complex in cisc they can take >1 cycle to complete, where as in RISC they should be single cycle. The main differences are found here: +——————————+——————————+ | CISC | RISC … Read more

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