[LLVMbugs] [Bug 21448] New: Loads are not combined across llvm.assume

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21448

            Bug ID: 21448
           Summary: Loads are not combined across llvm.assume
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: kfischer at college.harvard.edu
                CC: hfinkel at anl.gov, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I tried out the llvm.assume functionality and unfortunately it caused a rather
large regression in my test case because several loads were no longer combined
across the llvm.assume. I presume this is because LoadCombine does not know
that llvm.assume does not write to memory.

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