https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102526
Bug ID: 102526
Summary: Failed to link simd code if -O0
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: cyb70289 at gmail dot com
Target Milestone: ---
Below test code assigns an simd intrinsic to another variable, and call
intrinic through that variable. GCC failed to link if build with -O0.
Test code
=========
#include <emmintrin.h>
int main()
{
auto func = _mm_add_epi8;
auto v = func(_mm_set1_epi8(0), _mm_set1_epi8(1));
return 0;
}
Build error
===========
$ g++ -O0 test.cc -msse2
/usr/bin/ld: /tmp/cc6pJnIg.o: in function `main':
test.cc:(.text+0x18): undefined reference to `_mm_add_epi8(long long
__vector(2), long long __vector(2))'
collect2: error: ld returned 1 exit status
$ g++ -O1 test.cc -msse2
<OK>
