[LLVMbugs] [Bug 11997] New: BB vectorizer does not use TLI (target lowering information)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11997

             Bug #: 11997
           Summary: BB vectorizer does not use TLI (target lowering
                    information)
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: spop at codeaurora.org
                CC: hfinkel at anl.gov, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The BB vectorizer should be instantiated with the target information in a
similar way to LSR (loop strength reduction): LSR is using the target lowering
information to extract information about the existing addressing modes of the
target architecture: here is for instance the constructor of LSR:
LoopStrengthReduce::LoopStrengthReduce(const TargetLowering *tli)

The vectorizer should infer the vectorization factor from TLI, not from the
flag:
static cl::opt<unsigned>
VectorBits("bb-vectorize-vector-bits", cl::init(128), cl::Hidden,
  cl::desc("The size of the native vector registers"));

TLI has to be used to determine which vector types are supported by the target:
for example, some targets do not support float vectors.

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