inline-assembly

I know Java is a secure language but when matrix calculations are needed, can I try something faster? I am learning __asm{} in C++, Digital-Mars compiler and FASM. I want to do the same in Java. How can I inline assembly codes in functions? Is this even possible? Something like this (a vectorized loop to clamp all elements of an array to a value without branching, using AVX support of CPU): JavaAsmBlock( # get pointers into registers somehow # and tell Java which registers the asm clobbers somehow vbroadcastss twenty_five(%rip), %ymm0 xor %edx,%edx .Lloop: # do { vmovups (%rsi, %rdx, 4), %ymm1

I looked into some C code from http://www.mcs.anl.gov/~kazutomo/rdtsc.html They use stuff like " inline ", " asm " etc like the following: code1: static __inline__ tick gettick (void) { unsigned a, d; __asm__ __volatile__("rdtsc": "=a" (a), "=d" (d) ); return (((tick)a) | (((tick)d) << 32)); } code2: volatile int __attribute__((noinline)) foo2 (int a0, int a1) { __asm__ __volatile__ (""); } I was wondering what does the code1 and code2 do? The __volatile__ modifier on an __asm__ block forces the compiler's optimizer to execute the code as-is. Without it, the optimizer may think it can be

I am trying to write inline assembly with my C code to perform compare and swap operation. My code is: typedef struct node { int data; struct node * next; struct node * backlink; int flag; int mark; } node_lf; typedef struct searchfrom { node_lf * current; node_lf * next; } return_sf; typedef struct csArg { node_lf * node; int mark; int flag; } cs_arg; typedef struct return_tryFlag { node_lf * node; int result; } return_tf; static inline node_lf cs(node_lf * address, cs_arg *old_val, cs_arg *new_val) { node_lf value = *address; __asm__ __volatile__("lock; cmpxchg16b %0; setz %1;" :"=m"(*

I'm trying to compile a simple C program (Win7 32bit, Mingw32 Shell and GCC 5.3.0). The C code is like this: #include <stdio.h> #include <stdlib.h> #define _set_tssldt_desc(n,addr,type) \ __asm__ ("movw $104,%1\n\t" \ :\ :"a" (addr),\ "m" (*(n)),\ "m" (*(n+2)),\ "m" (*(n+4)),\ "m" (*(n+5)),\ "m" (*(n+6)),\ "m" (*(n+7))\ ) #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),addr,"0x89") char *n; char *addr; int main(void) { char *n = (char *)malloc(100*sizeof(int)); char *addr = (char *)malloc(100*sizeof(int)); set_tss_desc(n, addr); free(n); free(addr); return 0; } _set_tssldt_desc(n

I wrote a code to add two arrays using KNC instructions with (512bit long vectors) on Xeon Phi intel coprocessor. However I've got segmentation part in the inline assembly part. Here it is my code: int main(int argc, char* argv[]) { int i; const int length = 65536; const int AVXLength = length / 16; float *A = (float*) aligned_malloc(length * sizeof(float), 64); float *B = (float*) aligned_malloc(length * sizeof(float), 64); float *C = (float*) aligned_malloc(length * sizeof(float), 64); for(i=0; i<length; i++){ A[i] = 1; B[i] = 2; } float * pA = A; float * pB = B; float * pC = C; for(i=0; i