[PATCH] [RFC][PATCH] Minor opt to access pointers to globals via pcrel GOT entries

[Bruno Cardoso Lopes]

Hi Rafael, updated the patch after your comments.

As talked on IRC, by dealing directly with MCExpr we gain all folding benefits that lowerConstant computes while getting rid of several layers and indirections of cstexprs contaning lots of getelementptrs, pointers and casts. Also, this patch generates equivalent .s or .o outputs, there's no need to implement this coming from a .s (one can always change the assembly source to use GOTPCREL instead).

Thanks,


http://reviews.llvm.org/D6922

Files:
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/Target/TargetLoweringObjectFile.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/Target/X86/X86TargetObjectFile.cpp
  lib/Target/X86/X86TargetObjectFile.h
  test/MC/X86/cstexpr-gotpcrel.ll

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