26/01/2012 · In x86 64-bit, I have the following instruction: and $0xf, %eax The contents of %eax before and after remains 4. How is that possible? ANDing 100 & 1111 should result in 1100 which is 12, and...

05/12/2012 · In Google you can just write the name of the instruction, in this case test, and something like intel instruction (for Intel instructions): Google: test intel instruction From the results of the Google search linked above you'll also find out that some servers have separate pages for different x86 assembly instructions named according to the name of the instruction:

The syntax of x86 I think is different, you'd have to do probably IN 3f8h, ah or something similar, i.e. into a register first with the data coming in, then you'd MOV 800h, ah i.e. mov the data into the memory location in the RAM, (If you wanted to store it), or do something else with ah etc. ah is an example register, it could be any, al, bh, bl etc whatever, but check the syntax, every assembler …

06/08/2018 · Notes: 1 AAA and AAS are not available in 64-bit code on x86-64 processors.; 2 Some 80386 and 80486 documentation doesn't make it clear that the upper 4 bits of AL are always cleared in the result no matter what processor is being used. The documentation you have quoted from the article is also wrong in that regard. Related issues with AAS instruction.; 3 …

13/10/2010 · In x86 assembly, the overflow flag is set when an add or sub operation on a signed integer overflows, and the carry flag is set when an operation on an unsigned integer overflows. However, when it comes to the inc and dec instructions, the situation seems to be somewhat different. According to this website, the inc instruction does not affect the ...

04/08/2010 · Here in the above the TAB symbol is assigned to MLC address 0A4. in the next instruction ORG sets the MLC to TAB+240 address location which is x'194' (~ x'A4' + 240 in decimal). basically this set up is setup a table with length 256 and from 240 th location to store some character constants so that I can use it for TR instruction.

I am trying to learn up to date x86 assembly all from old 386 base instructions through all the sse additions up until now. I read some things like SSE5 counts 170 new instructions - and I became urged to know how many of them there are presently in total. Some may say that it's hard to count (because some of them are close, but work on different ...

22/09/2011 · Its second operand specifies the bit index into the first operand. Bt copies the addressed bit into the carry flag. For example, the instruction. bt ax, 12 copies bit twelve of ax into the carry flag. The bt/bts/btr/btc instructions only deal with 16 or 32 bit operands. This is not a limitation of the instruction.

26/10/2018 · Just write the instruction inline like this. __asm("sete %al"); sete al will also work, since we don't care what the operands are, the only important thing is the mnemonic. Then if you hover the mouse on the word sete you'll see the documentation tooltip appears. Now put the cursor on that word and press Ctrl+F8. Another popup will appear. SETE help

05/07/2019 · assembly x86-64 intel instructions. Share. Improve this question. Follow edited Sep 17 2021 at 15:49. janw. 6,674 8 8 gold badges 29 29 silver badges 53 53 bronze badges. asked Jul 5 2019 at 15:28. Mah35h Mah35h. 817 1 1 gold badge 5 5 silver badges 13 13 bronze badges. 3. 6. See this pdf from intel