Rule A7-4-1 (required, implementation, automated)
The asm declaration shall not be used.
Rationale
Inline assembly code restricts the portability of the code.
Example
// $Id: A7-4-1.cpp 289436 2017-10-04 10:45:23Z michal.szczepankiewicz $
#include <cstdint>
std::int32_t Fn1(std::int32_t b) noexcept
{
std::int32_t ret = 0;
// ...
asm("pushq %%rax \n"
"movl %0, %%eax \n"
"addl %1, %%eax \n"
"movl %%eax, %0 \n"
"popq %%rax"
: "=r"(ret)
: "r"(b)); // Non-compliant
return ret;
}
std::int32_t Fn2(std::int32_t b) noexcept
{
std::int32_t ret = 0;
// ...
ret += b; // Compliant - equivalent to asm(...) above
return ret;
}
See also
HIC++ v4.0 [9]: 7.5.1 Do not use the asm declaration.