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      1 ; RUN: llc < %s -march=x86-64
      2 ; PR3763
      3 	%struct.__block_descriptor = type { i64, i64 }
      4 
      5 define %struct.__block_descriptor @evUTCTime() nounwind {
      6 entry:
      7 	br i1 false, label %if.then, label %return
      8 
      9 if.then:		; preds = %entry
     10 	%srcval18 = load i128* null, align 8		; <i128> [#uses=1]
     11 	%tmp15 = lshr i128 %srcval18, 64		; <i128> [#uses=1]
     12 	%tmp9 = mul i128 %tmp15, 18446744073709551616000		; <i128> [#uses=1]
     13 	br label %return
     14 
     15 return:		; preds = %if.then, %entry
     16 	%retval.0 = phi i128 [ %tmp9, %if.then ], [ undef, %entry ]		; <i128> [#uses=0]
     17 	ret %struct.__block_descriptor undef
     18 }
     19 
     20 define i128 @test(i128 %arg) nounwind {
     21 	%A = shl i128 1, 92
     22 	%B = sub i128 0, %A
     23 	%C = mul i128 %arg, %B
     24 	ret i128 %C  ;; should codegen to neg(shift)
     25 }
     26