https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111051
--- Comment #1 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Found this difference, looks reasonable?
// $ cat a.cc
#include <immintrin.h>
#pragma GCC target("avx512vl,avx512dq")
void bug(__m256i i) {
volatile auto v1 = _mm256_cvtepi64_pd(i);
}
Difference:
$ g++-13 -c a.cc
# ok
$ g++-14 -c a.cc
In file included from
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/immintrin.h:71,
from a.cc:1:
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/avx512vldqintrin.h:
In function '__m256d _mm256_cvtepi64_pd(__m256i)':
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/avx512vldqintrin.h:910:1:
note: the ABI for passing parameters with 32-byte alignment has changed in GCC
4.6
910 | _mm256_cvtepi64_pd (__m256i __A)
| ^~~~~~~~~~~~~~~~~~
a.cc:7:1: warning: AVX vector return without AVX enabled changes the ABI
[-Wpsabi]
7 | }
| ^
In file included from
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/immintrin.h:43:
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/avxintrin.h:1238:1:
error: inlining failed in call to 'always_inline' '__m256d
_mm256_setzero_pd()': target specific option mismatch
1238 | _mm256_setzero_pd (void)
| ^~~~~~~~~~~~~~~~~
/<<NIX>>/gcc-14.0.0/lib/gcc/x86_64-unknown-linux-gnu/14.0.0/include/avx512vldqintrin.h:912:10:
note: called from here
912 | return (__m256d) __builtin_ia32_cvtqq2pd256_mask ((__v4di) __A,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
913 | (__v4df)
| ~~~~~~~~
914 | _mm256_setzero_pd
(),
|
~~~~~~~~~~~~~~~~~~~~~
915 | (__mmask8) -1);
| ~~~~~~~~~~~~~~
