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c++ Programming Glossary: rcxDifference between rdtscp, rdtsc : memory and cpuid / rdtsc? http://stackoverflow.com/questions/12631856/difference-between-rdtscp-rdtsc-memory-and-cpuid-rdtsc rdx rax and or onto rax a tsc output to tsc variable rcx rdx rcx and rdx are clobbered However rdtscp is only available.. and or onto rax a tsc output to tsc variable rcx rdx rcx and rdx are clobbered However rdtscp is only available on newer.. rdx up or rdx rax and or onto rax a tsc output to tsc rcx rdx rcx and rdx are clobbered 3 This is a call to rdtsc with..
Why does changing `const ull` to `const ull&` in function parameter result in performance gain? http://stackoverflow.com/questions/14805641/why-does-changing-const-ull-to-const-ull-in-function-parameter-result-in-pe x rhs_it data i carry 11.10 400b40 4c 89 c9 mov r9 rcx 0.00 400b43 48 89 fa mov rdi rdx 0.01 400b46 48.. 8 rdx 11.65 400b4a 48 0f af 0c c3 imul rbx rax 8 rcx 0.99 400b4f 48 01 ca add rcx rdx if tmp imax.. 0c c3 imul rbx rax 8 rcx 0.99 400b4f 48 01 ca add rcx rdx if tmp imax carry tmp numbits ..
Do modern compilers optimize the x * 2 operation to x << 1? http://stackoverflow.com/questions/235072/do-modern-compilers-optimize-the-x-2-operation-to-x-1 mov edx dword ptr x printf d y 000000013FB91022 lea rcx string d 13FB921B0h 000000013FB91029 add edx edx This is will..
In what cases should I use memcpy over standard operators in C++? http://stackoverflow.com/questions/4544804/in-what-cases-should-i-use-memcpy-over-standard-operators-in-c added by hand Copy by hand 10a11 18 movq _a@GOTPCREL rip rcx movq _b@GOTPCREL rip rdx movl rdx eax movl eax rcx movl 4 rdx.. rip rcx movq _b@GOTPCREL rip rdx movl rdx eax movl eax rcx movl 4 rdx eax movl eax 4 rcx movl 8 rdx eax movl eax 8 rcx.. rdx movl rdx eax movl eax rcx movl 4 rdx eax movl eax 4 rcx movl 8 rdx eax movl eax 8 rcx memcpy 10a11 16 movq _a@GOTPCREL..
http://stackoverflow.com/questions/6432669/variance-in-rdtsc-overhead xorl eax eax n t cpuid n t rdtsc a lo d hi no inputs rbx rcx return unsigned long long hi 32ull unsigned long long lo unsigned..
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