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_mm_pause not defined [message #49165]

Fri, 29 December 2017 23:16

forlano
Messages: 1221
Registered: March 2006
Location: Italy

Senior Contributor

Hello,

I was compiling my program using latest U++ 11634, Mingw compiling for 32 bit platform.
I got the error:

C:\upp\uppsrc\Core\Mt.cpp (635): error: '_mm_pause' was not declared in this scope

located in Mt.cpp:

void SpinLock::Wait()
{
volatile int n = 0;
while(locked) {
#ifdef CPU_X86
_mm_pause(); //<< error
#endif
if(n++ > 500)
Sleep(0);
}
}

Any idea how to fix it?
Thanks,
Luigi

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Re: _mm_pause not defined [message #49166 is a reply to message #49165]

Sat, 30 December 2017 10:29

Oblivion
Messages: 1266
Registered: August 2007

Senior Contributor

Hello,

I can confirm this for latest nightly builds on Linux (kernel: 4.14 - x86_64 platform, GCC 7.2.1

The reason seems to be that the following header file is missing.