[PATCH] D158056: [clang] Implement constexpr operator[] for vectors

[Joey Rabil via Phabricator via cfe-commits]

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This implements the array subscript operator for vector types.

As vectors don't decay into pointers, I've opted to evaluate the vector
operand as an LValue, which still gives the expected behavior.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158056

Files:
  clang/include/clang/Basic/DiagnosticASTKinds.td
  clang/lib/AST/ExprConstant.cpp
  clang/lib/AST/Interp/State.h
  clang/test/SemaCXX/constexpr-vectors.cpp

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