[PATCH] D93597: [X86][SSE] Enable constexpr on some basic SSE intrinsics (RFC)

[Simon Pilgrim via Phabricator via cfe-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, pengfei, rsmith, erichkeane, spatel.
RKSimon requested review of this revision.
Herald added a project: clang.

This is an initial exploratory patch towards making some (basic initialization and arithmetic) SSE/AVX intrinsics usable in constant expressions.

I've only touched the SSE1 intrinsics that we can do so far - if people are happy with the approach I'll extend the patch to cover the equivalent SSE2->AVX512 intrinsics/types.

My main concern is how best to test these - all we're doing so far is checking that they will compile, which might be enough for now?

A later patch will have to address how to support __builtin_shufflevector/__builtin_convertvector and element accessors.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93597

Files:
  clang/lib/Headers/xmmintrin.h
  clang/test/CodeGen/X86/sse-builtins.c

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