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22 sie 2020 · If you know a runtime input is a power of 2, use lea eax, [esi-1]; and eax, edi or something like that to do x & (y-1). Modulo 256 is even more efficient: movzx eax, cl has zero latency on recent Intel CPUs ( mov-elimination ), as long as the two registers are separate.
21 mar 2017 · Not all ARM processors have a direct instruction for division or modulo, so in most cases, a call to the modulo operation would end up as a function call to e.g. ___modsi3. In this particular case, when doing modulo for 8, if the values can be assumed to be nonnegative, you can do the % 8part as & 7. In that case, the assembly for your case ...
6 sie 2016 · Architekturę ARM na ogół przydziela się do grupy RISC, a x86 – do CISC. Na czym polega różnica i czy jest ona dziś istotna?
11 cze 2021 · X86 assembly instructions have a one-to-one relationship with the underlying machine instructions. This means that essentially we can convert assembly instructions into machine instructions with a look-up table.
1 gru 2015 · For the most part, each byte may be segmented into 2+3+3 bits, for 3 octal digits, the first digit ranging between 0 and 3, the last two digits each ranging from 0 to 7. There are a few exceptions, such as the opcodes for the conditional jump instructions: e.g. 70-7f in hexadecimal.
29 lis 2012 · Architektura ARM nie jest binarnie zgodna z x86, co oznacza, że nie można na niej normalnie uruchomić systemów operacyjnych i programów skompilowanych dla PC-tów. Emulowanie x86 też nie wchodzi w grę.
The ModR/M byte is an important part of instruction encoding for the x86 instruction set. Description. [edit] Opcodes in x86 are generally one-byte, though two-byte instructions and prefixes exist. ModR/M is a byte that, if required, follows the opcode and specifies zero, one, or two operands for the instruction. [ 1 ]: §2.1. The format is:
