; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -S -basic-aa -loop-predication < %s 2>&1 | FileCheck %s ; RUN: opt -S -aa-pipeline=basic-aa -passes='require,require,loop(loop-predication)' < %s 2>&1 | FileCheck %s declare void @llvm.experimental.guard(i1, ...) @UNKNOWN = external global i1 define i32 @neg_length_variant(i32* %array, i32* %length, i32 %n) { ; CHECK-LABEL: @neg_length_variant( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4 ; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %len = load i32, i32* %length, align 4 %within.bounds = icmp ult i32 %i, %len call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %continue = icmp ult i32 %i.next, %n br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } define i32 @invariant_load_guard_limit(i32* %array, i32* %length, i32 %n) { ; CHECK-LABEL: @invariant_load_guard_limit( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4, !invariant.load !0 ; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], [[LEN]] ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 0, [[LEN]] ; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP2]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %len = load i32, i32* %length, align 4, !invariant.load !{} %within.bounds = icmp ult i32 %i, %len call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %continue = icmp ult i32 %i.next, %n br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } ; Case where we have an invariant load, but it's not loading from a loop ; invariant location. define i32 @neg_varying_invariant_load_op(i32* %array, i32* %lengths, i32 %n) { ; CHECK-LABEL: @neg_varying_invariant_load_op( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[LENGTH_ADDR:%.*]] = getelementptr i32, i32* [[LENGTHS:%.*]], i32 [[I]] ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH_ADDR]], align 4, !invariant.load !0 ; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %length.addr = getelementptr i32, i32* %lengths, i32 %i %len = load i32, i32* %length.addr, align 4, !invariant.load !{} %within.bounds = icmp ult i32 %i, %len call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %continue = icmp ult i32 %i.next, %n br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } ; This is a case where moving the load which provides the limit for the latch ; would be invalid, so we can't preform the tempting transform. Loading the ; latch limit may fault since we could always fail the guard. define i32 @neg_invariant_load_latch_limit(i32* %array, i32* %length, i32 %n) { ; CHECK-LABEL: @neg_invariant_load_latch_limit( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4, !invariant.load !0 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %within.bounds = icmp ult i32 %i, %n call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %len = load i32, i32* %length, align 4, !invariant.load !{} %continue = icmp ult i32 %i.next, %len br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } define i32 @invariant_load_latch_limit(i32* %array, ; CHECK-LABEL: @invariant_load_latch_limit( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4, !invariant.load !0 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; i32* dereferenceable(4) %length, i32 %n) { entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %within.bounds = icmp ult i32 %i, %n call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %len = load i32, i32* %length, align 4, !invariant.load !{} %continue = icmp ult i32 %i.next, %len br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } @Length = external constant i32 define i32 @constant_memory(i32* %array, i32 %n) { ; CHECK-LABEL: @constant_memory( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* @Length, align 4 ; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], [[LEN]] ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 0, [[LEN]] ; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP2]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %len = load i32, i32* @Length, align 4 %within.bounds = icmp ult i32 %i, %len call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %continue = icmp ult i32 %i.next, %n br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result } define i32 @constant_length(i32* %array, i32 %n) { ; CHECK-LABEL: @constant_length( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] ; CHECK: loop.preheader: ; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], 20 ; CHECK-NEXT: [[TMP1:%.*]] = and i1 true, [[TMP0]] ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] ; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP1]], i32 9) [ "deopt"() ] ; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 ; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]] ; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4 ; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] ; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 ; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] ; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: exit.loopexit: ; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] ; CHECK-NEXT: ret i32 [[RESULT]] ; entry: %tmp5 = icmp eq i32 %n, 0 br i1 %tmp5, label %exit, label %loop.preheader loop.preheader: br label %loop loop: %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] %unknown = load volatile i1, i1* @UNKNOWN call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] %within.bounds = icmp ult i32 %i, 20 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] %i.i64 = zext i32 %i to i64 %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 %array.i = load i32, i32* %array.i.ptr, align 4 %loop.acc.next = add i32 %loop.acc, %array.i %i.next = add nuw i32 %i, 1 %continue = icmp ult i32 %i.next, %n br i1 %continue, label %loop, label %exit exit: %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] ret i32 %result }