https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97149
Bug ID: 97149
Summary: sincos failed to be vectorized by gcc
Product: gcc
Version: 10.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: kangshan0910 at hotmail dot com
Target Milestone: ---
My code pattern is:
for (unsigned int i = 0; i < loopCount; i++)
{
for (unsigned int j = i * dim; j < (i + 1) * dim; j++)
{
sincos(input_array[j], &result_arrays[j], &result_arrayc[j]);
}
}
And I compiled the code with the following options:
gcc -m64 -g -O2 -fPIC -Wall test_sincos.c -o test_sincos -lm
-march=skylake-avx512 -ffast-math -ftree-loop-vectorize
$ ldd test_sincos
linux-vdso.so.1 (0x00007ffd2393f000)
libm.so.6 => /lib64/libm.so.6 (0x00007f574f49d000)
libc.so.6 => /lib64/libc.so.6 (0x00007f574f2a2000)
/lib64/ld-linux-x86-64.so.2 (0x00007f574f601000)
You can find the the libmvec.so is not linked. I tried other functions such as
sin, cos, log... with the same code pattern and they can be vectorized by gcc.
But sincos cannot. Is there anything I missed?
My gcc version is "10.1.1 20200507".
