[Bug d/101127] New: d: Compile-time reflection for supported built-ins

[ibuclaw at gdcproject dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101127

            Bug ID: 101127
           Summary: d: Compile-time reflection for supported built-ins
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

With the 11 release, compile-time reflection support was added for vector
types, but this does not extend to built-ins that use them.

e.g:
---

// This prints "Yes" with -mavx because vector(float[8]) also becomes
available.
static if (__traits(compiles, __builtin_ia32_andps256 ))
    pragma(msg, "Yes AVX support");
else
    pragma(msg, "No AVX support");


// Always prints "Yes", because vector(short[8]) is available from -msse
static if (__traits(compiles, __builtin_ia32_pmulhrsw128))
    pragma(msg, "Yes SSSE3 support");
else
    pragma(msg, "No SSSE3 support");