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      1 ; RUN: llc < %s -march=x86
      2 ; PR2775
      3 
      4 define i32 @func_77(i8 zeroext %p_79) nounwind {
      5 entry:
      6 	%0 = tail call i32 (...) @func_43(i32 1) nounwind		; <i32> [#uses=1]
      7 	%1 = icmp eq i32 %0, 0		; <i1> [#uses=1]
      8 	br i1 %1, label %bb3, label %bb
      9 
     10 bb:		; preds = %entry
     11 	br label %bb3
     12 
     13 bb3:		; preds = %bb, %entry
     14 	%p_79_addr.0 = phi i8 [ 0, %bb ], [ %p_79, %entry ]		; <i8> [#uses=1]
     15 	%2 = zext i8 %p_79_addr.0 to i32		; <i32> [#uses=2]
     16 	%3 = zext i1 false to i32		; <i32> [#uses=2]
     17 	%4 = tail call i32 (...) @rshift_u_s(i32 1) nounwind		; <i32> [#uses=0]
     18 	%5 = lshr i32 %2, %2		; <i32> [#uses=3]
     19 	%6 = icmp eq i32 0, 0		; <i1> [#uses=1]
     20 	br i1 %6, label %bb6, label %bb9
     21 
     22 bb6:		; preds = %bb3
     23 	%7 = ashr i32 %5, %3		; <i32> [#uses=1]
     24 	%8 = icmp eq i32 %7, 0		; <i1> [#uses=1]
     25 	%9 = select i1 %8, i32 %3, i32 0		; <i32> [#uses=1]
     26 	%. = shl i32 %5, %9		; <i32> [#uses=1]
     27 	br label %bb9
     28 
     29 bb9:		; preds = %bb6, %bb3
     30 	%.0 = phi i32 [ %., %bb6 ], [ %5, %bb3 ]		; <i32> [#uses=0]
     31 	br i1 false, label %return, label %bb10
     32 
     33 bb10:		; preds = %bb9
     34 	ret i32 undef
     35 
     36 return:		; preds = %bb9
     37 	ret i32 undef
     38 }
     39 
     40 declare i32 @func_43(...)
     41 
     42 declare i32 @rshift_u_s(...)
     43