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1; RUN: llc < %s -mtriple=i386-apple-darwin -O02 3define fastcc void @optimize_bit_field() nounwind {4bb4:5 %a = load i32, ptr null ; <i32> [#uses=1]6 %s = load i32, ptr getelementptr (i32, ptr null, i32 1) ; <i32> [#uses=1]7 %z = load i32, ptr getelementptr (i32, ptr null, i32 2) ; <i32> [#uses=1]8 %r = bitcast i32 0 to i32 ; <i32> [#uses=1]9 %q = trunc i32 %z to i8 ; <i8> [#uses=1]10 %b = icmp eq i8 0, %q ; <i1> [#uses=1]11 br i1 %b, label %bb73, label %bb7212 13bb72: ; preds = %bb414 %f = tail call fastcc i32 @gen_lowpart(i32 %r, i32 %a) nounwind ; <i32> [#uses=1]15 br label %bb7316 17bb73: ; preds = %bb72, %bb418 %y = phi i32 [ %f, %bb72 ], [ %s, %bb4 ] ; <i32> [#uses=1]19 store i32 %y, ptr getelementptr (i32, ptr null, i32 3)20 unreachable21}22 23declare fastcc i32 @gen_lowpart(i32, i32) nounwind24