1 ; This is the test case taken from Appel's book that illustrates a hard case 2 ; that SCCP gets right, and when followed by ADCE, is completely eliminated 3 ; 4 ; RUN: opt < %s -sccp -simplifycfg -indvars -loop-deletion -dce -simplifycfg -S | not grep br 5 6 define i32 @"test function"(i32 %i0, i32 %j0) { 7 BB1: 8 br label %BB2 9 10 BB2: ; preds = %BB7, %BB1 11 %j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ] ; <i32> [#uses=2] 12 %k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ] ; <i32> [#uses=4] 13 %kcond = icmp slt i32 %k2, 100 ; <i1> [#uses=1] 14 br i1 %kcond, label %BB3, label %BB4 15 16 BB3: ; preds = %BB2 17 %jcond = icmp slt i32 %j2, 20 ; <i1> [#uses=1] 18 br i1 %jcond, label %BB5, label %BB6 19 20 BB4: ; preds = %BB2 21 ret i32 %j2 22 23 BB5: ; preds = %BB3 24 %k3 = add i32 %k2, 1 ; <i32> [#uses=1] 25 br label %BB7 26 27 BB6: ; preds = %BB3 28 %k5 = add i32 %k2, 1 ; <i32> [#uses=1] 29 br label %BB7 30 31 BB7: ; preds = %BB6, %BB5 32 %j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ] ; <i32> [#uses=1] 33 %k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ] ; <i32> [#uses=1] 34 br label %BB2 35 } 36 37
