[PATCH] [OPENMP] CodeGen for "omp atomic read [seq_cst]" directive.

[Alexey Bataev]

Hi rjmccall, ejstotzer, fraggamuffin,

"omp atomic read [seq_cst]" accepts expressions "v=x;". In this patch we perform an atomic load of "x" (using builtin atomic loading instructions or a call to "atomic_load()" for simple lvalues and "__kmpc_atomic_start();load <x>;__kmpc_atomic_end();" for other lvalues), convert the result of loading to type of "v" (using EmitScalarConversion() for simple types and EmitComplexToScalarConversion() for conversions from complex to scalar) and then store the result in "v".

http://reviews.llvm.org/D6431

Files:
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGOpenMPRuntime.cpp
  lib/CodeGen/CGOpenMPRuntime.h
  lib/CodeGen/CGStmtOpenMP.cpp
  test/OpenMP/atomic_read_codegen.c
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