[Bug target/94832] AVX512 scatter/gather macros lack parentheses when unoptimized

[gcc at kheafield dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94832

--- Comment #3 from Kenneth Heafield <gcc at kheafield dot com> ---
Being a macro some of the time also causes trouble with template commas and the
C preprocessor.  

#include <immintrin.h>
template <class S, class T> int *TemplatedFunction();
void Fail() {
  _mm512_mask_i32scatter_epi32(TemplatedFunction<void, void>(), 0xffff,
_mm512_set1_epi32(1), _mm512_set1_epi32(1), 1);
}

Without optimization, error because the template , is interpreted by the macro. 

g++ -mavx512f -c template.cc 
template.cc:6:118: error: macro "_mm512_mask_i32scatter_epi32" passed 6
arguments, but takes just 5
    6 |   _mm512_mask_i32scatter_epi32(TemplatedFunction<void, void>(), 0xffff,
_mm512_set1_epi32(1), _mm512_set1_epi32(1), 1);
      |                                                                        
                                             ^
In file included from
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/include/immintrin.h:55,
                 from template.cc:1:
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/include/avx512fintrin.h:10475: note:
macro "_mm512_mask_i32scatter_epi32" defined here
10475 | #define _mm512_mask_i32scatter_epi32(ADDR, MASK, INDEX, V1, SCALE) \
      | 
template.cc: In function ‘void Fail()’:
template.cc:6:3: error: ‘_mm512_mask_i32scatter_epi32’ was not declared in this
scope
    6 |   _mm512_mask_i32scatter_epi32(TemplatedFunction<void, void>(), 0xffff,
_mm512_set1_epi32(1), _mm512_set1_epi32(1), 1);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


With optimization, no output.  
g++ -mavx512f -O3 -c template.cc