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I found a case where GVN seems to miscompile an OpenCL program. What I am trying to figure out is given a bitcode file, how can I reduce it to a simpler case with bugpoint when I don't have a valid reference compiler available. Thanks for any tips, Micah -------------- next part -------------- An HTML attachment was scrubbed... URL:

...r.end.i ], [ %nsign.2.i, %donchr.i ] %s.2.i = phi i8* [ %lstr.0.i, %for.end.i ], [ %incdec.ptr132.i, %donchr.i ] %8 = load i8* %s.2.i, align 1, !tbaa !1 %conv16.i = sext i8 %8 to i32 %sub.i = add nsw i32 %conv16.i, -48 %9 = icmp ult i32 %sub.i, 10 br i1 %9, label %if.then21.i, label %if.end112.i if.then21.i: ; preds = %nxtcom.i %cmp25.i = icmp eq i32 %decflg.0.i, 0 %10 = or i32 %prec.0.i, %decflg.0.i %11 = or i32 %10, %sub.i %12 = icmp eq i32 %11, 0 br i1 %12, label %donchr.i, label %if.end31.i if.end31.i:...