https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120712
Bug ID: 120712
Summary: how to use __builtin_ia32_prefetchi
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: LYN_2019 at outlook dot com
Target Milestone: ---
x86_64-linux-g++ -m64 -mprefetchi
```cpp
void x86_perfchi(void* p) noexcept
{
__builtin_ia32_prefetchi(p, 0);
}
```
```
<source>: In function 'void x86_perfchi(void*)':
<source>:3:29: warning: instruction prefetch applies when in 64-bit mode with
RIP-relative addressing and option '-mprefetchi'; they stay NOPs otherwise
3 | __builtin_ia32_prefetchi(p, 0);
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
Compiler returned: 0
```
