[Bug c++/80439] New: __attribute__((target("xxx"))) not applied to lambdas

[thiago at kde dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80439

            Bug ID: 80439
           Summary: __attribute__((target("xxx"))) not applied to lambdas
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thiago at kde dot org
  Target Milestone: ---

Testcase (see also https://godbolt.org/g/H2xjNc for GCC and Clang build):

========
#include <immintrin.h>
#include <stdint.h>

__attribute__((target("sse4.2")))
unsigned aeshash(const uint8_t *p, size_t len, unsigned seed)
{
    const auto l = [](unsigned data) {
        __m128i m = _mm_insert_epi32(_mm_setzero_si128(), data, 1);
        return _mm_extract_epi32(m, 1);
    };
    return l(seed);
}========

In the testcase above, if the source is compiled with base options for x86
(either 32- or 64-bit mode), GCC fails to compile with error:

/usr/lib/gcc/x86_64-linux-gnu/6.3.0/include/smmintrin.h:447:1: error: inlining
failed in call to always_inline 'int _mm_extract_epi32(__m128i, int)': target
specific option mismatch
 _mm_extract_epi32 (__m128i __X, const int __N)
 ^~~~~~~~~~~~~~~~~
<source>:9:38: note: called from here
         return _mm_extract_epi32(m, 1);
                                      ^

Clang compiles the above just fine.

The compilation works if I add __attribute__((target("sse4.2"))) to the lambda.