1 ; RUN: opt < %s -loop-unswitch -verify-loop-info -S < %s 2>&1 | FileCheck %s 2 3 define i32 @test(i32* %A, i1 %C) { 4 entry: 5 br label %no_exit 6 no_exit: ; preds = %no_exit.backedge, %entry 7 %i.0.0 = phi i32 [ 0, %entry ], [ %i.0.0.be, %no_exit.backedge ] ; <i32> [#uses=3] 8 %gep.upgrd.1 = zext i32 %i.0.0 to i64 ; <i64> [#uses=1] 9 %tmp.7 = getelementptr i32* %A, i64 %gep.upgrd.1 ; <i32*> [#uses=4] 10 %tmp.13 = load i32* %tmp.7 ; <i32> [#uses=2] 11 %tmp.14 = add i32 %tmp.13, 1 ; <i32> [#uses=1] 12 store i32 %tmp.14, i32* %tmp.7 13 br i1 %C, label %then, label %endif 14 then: ; preds = %no_exit 15 %tmp.29 = load i32* %tmp.7 ; <i32> [#uses=1] 16 %tmp.30 = add i32 %tmp.29, 2 ; <i32> [#uses=1] 17 store i32 %tmp.30, i32* %tmp.7 18 %inc9 = add i32 %i.0.0, 1 ; <i32> [#uses=2] 19 %tmp.112 = icmp ult i32 %inc9, 100000 ; <i1> [#uses=1] 20 br i1 %tmp.112, label %no_exit.backedge, label %return 21 no_exit.backedge: ; preds = %endif, %then 22 %i.0.0.be = phi i32 [ %inc9, %then ], [ %inc, %endif ] ; <i32> [#uses=1] 23 br label %no_exit 24 endif: ; preds = %no_exit 25 %inc = add i32 %i.0.0, 1 ; <i32> [#uses=2] 26 %tmp.1 = icmp ult i32 %inc, 100000 ; <i1> [#uses=1] 27 br i1 %tmp.1, label %no_exit.backedge, label %return 28 return: ; preds = %endif, %then 29 ret i32 %tmp.13 30 } 31 32 ; This simple test would normally unswitch, but should be inhibited by the presence of 33 ; the noduplicate call. 34 35 ; CHECK-LABEL: @test2( 36 define i32 @test2(i32* %var) { 37 %mem = alloca i32 38 store i32 2, i32* %mem 39 %c = load i32* %mem 40 41 br label %loop_begin 42 43 loop_begin: 44 45 %var_val = load i32* %var 46 47 switch i32 %c, label %default [ 48 i32 1, label %inc 49 i32 2, label %dec 50 ] 51 52 inc: 53 call void @incf() noreturn nounwind 54 br label %loop_begin 55 dec: 56 ; CHECK: call void @decf() 57 ; CHECK-NOT: call void @decf() 58 call void @decf() noreturn nounwind noduplicate 59 br label %loop_begin 60 default: 61 br label %loop_exit 62 loop_exit: 63 ret i32 0 64 ; CHECK: } 65 } 66 67 declare void @incf() noreturn 68 declare void @decf() noreturn 69
