[PATCH] D20133: [OpenCL] Fix __builtin_astype for vec3 types.

[Yaxun Liu via cfe-commits]

yaxunl created this revision.
yaxunl added reviewers: Anastasia, pxli168, bader.
yaxunl added subscribers: cfe-commits, tstellarAMD.

__builtin_astype does not generate correct LLVM IR for vec3 types. This patch inserts bitcasts to/from vec4 when necessary in addition to generating vector shuffle. A codegen test is added.

http://reviews.llvm.org/D20133

Files:
  lib/CodeGen/CGExprScalar.cpp
  test/CodeGenOpenCL/as_type.cl

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