1 ; Here we have a case where there are two loops and LICM is hoisting an 2 ; instruction from one loop into the other loop! This is obviously bad and 3 ; happens because preheader insertion doesn't insert a preheader for this 4 ; case... bad. 5 6 ; RUN: opt < %s -licm -loop-deletion -simplifycfg -S | \ 7 ; RUN: not grep {br } 8 9 define i32 @main(i32 %argc) { 10 ; <label>:0 11 br label %bb5 12 bb5: ; preds = %bb5, %0 13 %I = phi i32 [ 0, %0 ], [ %I2, %bb5 ] ; <i32> [#uses=1] 14 %I2 = add i32 %I, 1 ; <i32> [#uses=2] 15 %c = icmp eq i32 %I2, 10 ; <i1> [#uses=1] 16 br i1 %c, label %bb5, label %bb8 17 bb8: ; preds = %bb8, %bb5 18 %cann-indvar = phi i32 [ 0, %bb8 ], [ 0, %bb5 ] ; <i32> [#uses=0] 19 %X = add i32 %argc, %argc ; <i32> [#uses=1] 20 br i1 false, label %bb8, label %bb10 21 bb10: ; preds = %bb8 22 ret i32 %X 23 } 24 25
