[clang] [X86] Add constexpr support for addsub and select intrinsics (PR #167512)

[Timm Baeder via cfe-commits]

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@@ -4279,6 +4279,36 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
           F.subtract(RHS, RM);
           return F;
         });
+  case clang::X86::BI__builtin_ia32_addsubpd:
+  case clang::X86::BI__builtin_ia32_addsubps:
+  case clang::X86::BI__builtin_ia32_addsubpd256:
+  case clang::X86::BI__builtin_ia32_addsubps256: {
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tbaederr wrote:

Use a static function like everything else.

https://github.com/llvm/llvm-project/pull/167512