I need help converting Intel inline asm to AT&T so I can compile it with gcc?

Would be nice to use proper inline functions. Anyway, here is your macro version.

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This is the original code: #define CPU_PREFETCH(cache_line) \ { int* address = (int*) (cache_line); \ _asm mov edx, address \ _asm prefetcht0edx \ } #define CPU_GET_CYCLES(low) \ { \ _asm rdtsc \ _asm mov dword ptr low, eax \ } #define CPU_SYNC \ { \ _asm mov eax, 0 \ _asm cpuid \ } #define CPU_CACHE_FLUSH(cache_line) \ { int* address = (int*) (cache_line); \ _asm mov edx, address \ _asm clflushedx \ _asm mfence \ } Thanks to Jester, I now have this: #define CPU_PREFETCH(cache_line) \ { \ __asm__ __volatile__ ("prefetcht0 %0" : : "m" (*(int*)cache_line)); \ } #define CPU_GET_CYCLES(low) \ { \ __asm__ __volatile__ ("rdtsc" : "=a" (low) : : "%edx"); \ } #define CPU_SYNC \ { \ __asm__ __volatile__ ("cpuid" : : : "%eax", "%ebx", "%ecx", "%edx"); \ } #define CPU_CACHE_FLUSH(cache_line) \ { \ __asm__ ("clflush %0; mfence" : : "m" (*(int*)cache_line)); \ } Evidently, gcc doesn't like volatile with clflush. Thanks everyone. I am trying to compile Slicing-By-8 with gcc as a dll so I can use it in my VB6 app.

How is that for irony? 0_o c gcc assembly inline gas link|improve this question edited Dec 19 '10 at 19:13 asked Dec 19 '10 at 8:27selyb83.

Would be nice to use proper inline functions. Anyway, here is your macro version: #define CPU_PREFETCH(cache_line) \ { \ __asm__ __volatile__ ("prefetcht0 %0" : : "m" (*(int*)cache_line)); \ } #define CPU_GET_CYCLES(low) \ { \ __asm__ __volatile__ ("rdtsc" : "=a" (low) : : "%edx"); \ } #define CPU_SYNC \ { \ __asm__ __volatile__ ("cpuid" : : : "%eax", "%ebx", "%ecx", "%edx"); \ } #define CPU_CACHE_FLUSH(cache_line) \ { \ __asm__ __volatile__ ("clflush %0; mfence" : : "m" (*(int*)cache_line)); \ }.

Man, that looks beautiful and looks as though you know exactly what you're doing :) Anyway, I get this error now: Error: operand size mismatch for `clflush' – selyb Dec 19 '10 at 17:22 I tried to click that this post was useful but I don't have enough reputation – selyb Dec 19 '10 at 19:14.

You can do it like this: add this line before any other assembly lines: asm(". Intel_syntax noprefix\n"); Then run GCC like this: gcc -o my_output_file -masm=intel my_src_file. C Thanks to stingduk at BiW Reversing.

This gives me a different error as shown in first post. – selyb Dec 19 '10 at 8:54 He forgot to add the backslash. – Hans Passant Dec 19 '10 at 17:01 Updated first post again – selyb Dec 19 '10 at 17:08.

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