1 ; These tests have an infinite trip count. We obviously shouldn't remove the 2 ; loops! :) 3 ; 4 ; RUN: opt < %s -indvars -adce -simplifycfg -S | grep icmp | wc -l > %t2 5 ; RUN: llvm-as < %s | llvm-dis | grep icmp | wc -l > %t1 6 ; RUN: diff %t1 %t2 7 8 ;; test for (i = 1; i != 100; i += 2) 9 define i32 @infinite_linear() { 10 entry: 11 br label %loop 12 13 loop: ; preds = %loop, %entry 14 %i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3] 15 %i.next = add i32 %i, 2 ; <i32> [#uses=1] 16 %c = icmp ne i32 %i, 100 ; <i1> [#uses=1] 17 br i1 %c, label %loop, label %loopexit 18 19 loopexit: ; preds = %loop 20 ret i32 %i 21 } 22 23 ;; test for (i = 1; i*i != 63; ++i) 24 define i32 @infinite_quadratic() { 25 entry: 26 br label %loop 27 28 loop: ; preds = %loop, %entry 29 %i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=4] 30 %isquare = mul i32 %i, %i ; <i32> [#uses=1] 31 %i.next = add i32 %i, 1 ; <i32> [#uses=1] 32 %c = icmp ne i32 %isquare, 63 ; <i1> [#uses=1] 33 br i1 %c, label %loop, label %loopexit 34 35 loopexit: ; preds = %loop 36 ret i32 %i 37 } 38 39
