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How do debuggers keep track of the mapping between C code and assembly instructions?


By : Lars Hansson
Date : October 16 2020, 06:10 AM
this one helps. Look at asm output from gcc -g -S and you'll see .line debug-info directives and so on for the block of asm corresponding to the C source line.
(With optimization enabled the same line can map to multiple non-contiguous instructions, so it gets much trickier, but compilers still try to be useful and map most instructions to some source line even if they're really the result of optimization and doing an operation that doesn't appear in the source...).
code :


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g++ 4.2 inline assembly of SSE instructions wraps up user assembly code with aligned XMM register copy


By : user3717097
Date : March 29 2020, 07:55 AM
With these it helps The intrinsic that you are looking for is _mm_loadu_si128. It is defined in emmintrin.h. Which is SSE2. The xmmintrin.h header contains only SSE(1) instructions.
http://software.intel.com/sites/products/documentation/studio/composer/en-us/2011/compiler_c/intref_cls/common/intref_sse2_int_load.htm

Assembly code/AVX instructions for multiplication of complex numbers. (GCC inline assembly)


By : Luke
Date : March 29 2020, 07:55 AM
hope this fix your issue As you surmise, the problem is that you haven’t told GCC which registers you are clobbering. I’m surprised if they don’t yet support putting YMM registers in the clobber list; what version of GCC are you using?
In any event, it will almost certainly suffice to put the corresponding XMM registers in the clobber list instead:
code :
: "=m" (ret) : "m" (*a), "m" (*b) : "%xmm1", "%xmm2");

Why do the different debuggers output different assembly code for the same function?


By : Diana Horn
Date : March 29 2020, 07:55 AM
this one helps. Case (1) shows the disassembly for the actual function.
Case (2) shows the PLT (procedure linkage table) entry for the function. The PLT is used to resolve functions imported from shared libraries. This is used by the main program when it invokes the function. Code flow will eventually end up in the real function, of course, through the help of the runtime linker.

I don't understand these assembly code and machine code differences if assembly code instructions are equivalent of mach


By : user23453
Date : March 29 2020, 07:55 AM
this one helps. Your question is a good one. It gets at the fundamental computer concept of indirection.
The normal way for a computer to treat a string of text like "Hello, world!" is to keep it in memory as a series of characters. For example:
code :
Memory address    Memory contents
8201              'H'
8202              'e'
8203              'l'
8204              'l'
8205              'o'
8206              ','
8207              ' '
...               ...
820E              0

Assembly Code Instructions


By : Ganesh Kumar S
Date : March 29 2020, 07:55 AM
help you fix your problem What does the operation , It's equivalent to the following in Intel syntax:
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