; RUN: llc < %s -march=x86-64 ; PR3763 %struct.__block_descriptor = type { i64, i64 } define %struct.__block_descriptor @evUTCTime() nounwind { entry: br i1 false, label %if.then, label %return if.then: ; preds = %entry %srcval18 = load i128, i128* null, align 8 ; [#uses=1] %tmp15 = lshr i128 %srcval18, 64 ; [#uses=1] %tmp9 = mul i128 %tmp15, 18446744073709551616000 ; [#uses=1] br label %return return: ; preds = %if.then, %entry %retval.0 = phi i128 [ %tmp9, %if.then ], [ undef, %entry ] ; [#uses=0] ret %struct.__block_descriptor undef } define i128 @test(i128 %arg) nounwind { %A = shl i128 1, 92 %B = sub i128 0, %A %C = mul i128 %arg, %B ret i128 %C ;; should codegen to neg(shift) }