Recent questions tagged x86

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x86 assembly (MASM) - Square root of a 64-bit integer?

I'm coding a simple primality tester program for Windows in x86 assembly language (MASM32), which involves ... 'm missing something here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - How to convert a positive number to negative in assembly

I want to convert a positive number to negative in assembly, I need a code sample The input is in hex sdword Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Java 10 (and following) on 32-Bit systems

As far as I know there are no plans from oracle to ship java for 32 Bit - but maybe I misunderstand the ... are only 64 Bit Download-Links. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Not sure why we add the registers %rdx and %rax when the assembly code has been using %eax and %edx

Hello I need some help understanding what is going on in this assembly code: .file "mystery.c" .text .globl ... edx? Thanks for any help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - What's the difference between vextracti128 and vextractf128?

vextracti128 and vextractf128 have the same functionality, parameters, and return values. In addition one is AVX ... What is the difference? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - What's the difference between __popcnt() and _mm_popcnt_u32()?

MS Visual C++ supports 2 flavors of the popcnt instruction on CPUs with SSE4.2: __popcnt() _mm_popcnt_u32() ... calls the HW _mm_popcnt_u32()? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Why are mov ah,bh and mov al, bl together much faster than single instruction mov ax, bx?

I've found that mov al, bl mov ah, bh is much faster than mov ax, bx Can anyone explain me why? I ... whole VS project with sources for testing. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - In Linux, on entry of a sys call, what is the value in %eax? (not orig_eax)

When a syscall returns, I get the syscall return value in %eax, however on entry I am getting -38, which ... an entry from an exit? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 64 - How to install python2.6-devel package under CentOs 5

I need to install mysql-python under python2.6. mysql-python package needs python2.6-devel package that depends on ... it. Thanks for help) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Is it possible to make a custom Interrupt in Assembly?

In Assembly Language we have the DOS interrupt INT 21h, which is not a hardware interrupt. I was wondering ... please suggest links or methods. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - VirtualBox - No bootable medium found

There are a lot of question on stackoverflow with the similar title. I read all of them, but none of them answers ... is actual VDI file: 1.vdi See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Assembly instructions to find how many threads are enabled in a multi-core system

I'm working on a bare-bones system in which I need to determine sometime after boot how many cores and threads ... how many cores there are. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Reset vector in 386+ processors

The wikipedia page for Reset vector says (for 386+ processors): The value of the selector portion of the ... versus the previous ones. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Why segmentation cannot be completely disable?

According to AMD manual segmentation can not be disabled. My question is why, why it's impossible? Another ... postimg.cc/hk15o6swr/Capture.png See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 Assembly: Before Making a System Call on Linux Should You Save All Registers?

I have the below code that opens up a file, reads it into a buffer and then closes the file. The close ... close file system call number int 80h See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Compilation of a simple c++ program using SSE intrinsics

I am new to the SSE instructions and I was trying to learn them from this site: http://www.codeproject. ... have included all the relevant ones. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - SSE intrinsics: Convert 32-bit floats to UNSIGNED 8-bit integers

Using SSE intrinsics, I've gotten a vector of four 32-bit floats clamped to the range 0-255 and rounded to nearest ... out[3]); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 64 - Get installed software list using C#

I try to get a list of installed application keys: RegistryKey RegKeyUninstallList = Registry.LocalMachine; string ... ).GetSubKeyNames(); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - SSE: Difference between _mm_load/store vs. using direct pointer access

Suppose I want to add two buffers and store the result. Both buffers are already allocated 16byte aligned. I ... /store is mandatory. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 64 - Do all 64 bit intel architectures support SSSE3/SSE4.1/SSE4.2 instructions?

I did searched on web and intel Software manual . But am unable to confirm if all Intel 64 architectures support ... my programme. Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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401 views

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x86 - In which condition DCU prefetcher start prefetching?

I am reading about different prefetcher available in Intel Core i7 system. I have performed experiments to ... prefetch starts prefetching? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - In which condition DCU prefetcher start prefetching?

I am reading about different prefetcher available in Intel Core i7 system. I have performed experiments to ... prefetch starts prefetching? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - In which condition DCU prefetcher start prefetching?

I am reading about different prefetcher available in Intel Core i7 system. I have performed experiments to ... prefetch starts prefetching? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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x86 - Why did Intel change the static branch prediction mechanism over these years?

From here I know Intel implemented several static branch prediction mechanisms these years: 80486 age: Always-not- ... will help more people See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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706 views

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x86 64 - movq assembly function

I was reading some code and was not sure what this line does: movq (%rsp), %rsp See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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487 views

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x86 - To learn assembly - should I start with 32 bit or 64 bit?

I'm really wanting to learn assembly. I'm pretty good at c/c++, but want a better understanding of what ... one way instead of another.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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660 views

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x86 - Assembly - How to multiply/divide a constant by another constant in assembly?

So, I have an assembly function, which is called in C. It compiles and gives me no warnings, but when ... the previous stack frame pointer ret See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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442 views

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x86 64 - config.site for vendor libs on Fedora x86_64

I'm having trouble building a few Autotool-based libraries on Fedora 26, x86_64. The 64-bit Fedora puts third party ... /lib64' break fi done fi See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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