| ; RUN: llc < %s -mtriple=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, ptr null, align 8		; <i128> [#uses=1] | 
 | 	%tmp15 = lshr i128 %srcval18, 64		; <i128> [#uses=1] | 
 | 	%tmp9 = mul i128 %tmp15, 18446744073709551616000		; <i128> [#uses=1] | 
 | 	br label %return | 
 |  | 
 | return:		; preds = %if.then, %entry | 
 | 	%retval.0 = phi i128 [ %tmp9, %if.then ], [ undef, %entry ]		; <i128> [#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) | 
 | } |