| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6 |
| ; RUN: opt -passes=irce < %s -S | FileCheck %s |
| |
| declare void @deopt() |
| |
| ; This test verifies that IRCE and LoopConstrainer can prove loop entry |
| ; predicates even when loop bounds are rewritten by applyLoopGuards(). |
| define i32 @main(i32 %limit, i32 %start, i32 %length) { |
| ; CHECK-LABEL: define i32 @main( |
| ; CHECK-SAME: i32 [[LIMIT:%.*]], i32 [[INDVAR_START:%.*]], i32 [[LENGTH:%.*]]) { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[CHECK0:%.*]] = icmp eq i32 [[LIMIT]], 0 |
| ; CHECK-NEXT: br i1 [[CHECK0]], label %[[EXIT:.*]], label %[[PREHEADER:.*]] |
| ; CHECK: [[PREHEADER]]: |
| ; CHECK-NEXT: [[PRE_CHECK:%.*]] = icmp slt i32 [[INDVAR_START]], [[LIMIT]] |
| ; CHECK-NEXT: br i1 [[PRE_CHECK]], label %[[LOOP__PREHEADER:.*]], label %[[DEOPT:.*]] |
| ; CHECK: [[LOOP__PREHEADER]]: |
| ; CHECK-NEXT: [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[LENGTH]], i32 0) |
| ; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[SMIN]], i32 -1) |
| ; CHECK-NEXT: [[TMP0:%.*]] = sub i32 -1, [[SMAX]] |
| ; CHECK-NEXT: [[SMIN1:%.*]] = call i32 @llvm.smin.i32(i32 [[LIMIT]], i32 [[TMP0]]) |
| ; CHECK-NEXT: [[EXIT_PRELOOP_AT:%.*]] = call i32 @llvm.smax.i32(i32 [[INDVAR_START]], i32 [[SMIN1]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[LENGTH]], -2147483647 |
| ; CHECK-NEXT: [[SMAX3:%.*]] = call i32 @llvm.smax.i32(i32 [[TMP1]], i32 1) |
| ; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[LENGTH]], [[SMAX3]] |
| ; CHECK-NEXT: [[TMP3:%.*]] = add nsw i32 [[SMAX]], 1 |
| ; CHECK-NEXT: [[TMP4:%.*]] = mul i32 [[TMP2]], [[TMP3]] |
| ; CHECK-NEXT: [[SMIN4:%.*]] = call i32 @llvm.smin.i32(i32 [[LIMIT]], i32 [[TMP4]]) |
| ; CHECK-NEXT: [[EXIT_MAINLOOP_AT:%.*]] = call i32 @llvm.smax.i32(i32 [[INDVAR_START]], i32 [[SMIN4]]) |
| ; CHECK-NEXT: [[TMP5:%.*]] = icmp slt i32 [[INDVAR_START]], [[EXIT_PRELOOP_AT]] |
| ; CHECK-NEXT: br i1 [[TMP5]], label %[[LOOP__PRELOOP_PREHEADER:.*]], label %[[PRELOOP_PSEUDO_EXIT:.*]] |
| ; CHECK: [[LOOP__PRELOOP_PREHEADER]]: |
| ; CHECK-NEXT: br label %[[LOOP__PRELOOP:.*]] |
| ; CHECK: [[MAINLOOP:.*]]: |
| ; CHECK-NEXT: [[TMP6:%.*]] = icmp slt i32 [[INDVAR_END:%.*]], [[EXIT_MAINLOOP_AT]] |
| ; CHECK-NEXT: br i1 [[TMP6]], label %[[LOOP__PREHEADER8:.*]], label %[[MAIN_PSEUDO_EXIT:.*]] |
| ; CHECK: [[LOOP__PREHEADER8]]: |
| ; CHECK-NEXT: br label %[[LOOP_:.*]] |
| ; CHECK: [[LOOP_]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], %[[GUARDED:.*]] ], [ [[IV_PRELOOP_COPY:%.*]], %[[LOOP__PREHEADER8]] ] |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1 |
| ; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[LENGTH]] |
| ; CHECK-NEXT: br i1 true, label %[[GUARDED]], label %[[DEOPT_LOOPEXIT_LOOPEXIT9:.*]] |
| ; CHECK: [[GUARDED]]: |
| ; CHECK-NEXT: [[EXIT_CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[LIMIT]] |
| ; CHECK-NEXT: [[TMP7:%.*]] = icmp slt i32 [[IV_NEXT]], [[EXIT_MAINLOOP_AT]] |
| ; CHECK-NEXT: br i1 [[TMP7]], label %[[LOOP_]], label %[[MAIN_EXIT_SELECTOR:.*]] |
| ; CHECK: [[MAIN_EXIT_SELECTOR]]: |
| ; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[IV_NEXT]], %[[GUARDED]] ] |
| ; CHECK-NEXT: [[TMP8:%.*]] = icmp slt i32 [[IV_NEXT_LCSSA]], [[LIMIT]] |
| ; CHECK-NEXT: br i1 [[TMP8]], label %[[MAIN_PSEUDO_EXIT]], label %[[EXIT_LOOPEXIT:.*]] |
| ; CHECK: [[MAIN_PSEUDO_EXIT]]: |
| ; CHECK-NEXT: [[IV_COPY:%.*]] = phi i32 [ [[IV_PRELOOP_COPY]], %[[MAINLOOP]] ], [ [[IV_NEXT_LCSSA]], %[[MAIN_EXIT_SELECTOR]] ] |
| ; CHECK-NEXT: [[INDVAR_END6:%.*]] = phi i32 [ [[INDVAR_END]], %[[MAINLOOP]] ], [ [[IV_NEXT_LCSSA]], %[[MAIN_EXIT_SELECTOR]] ] |
| ; CHECK-NEXT: br label %[[POSTLOOP:.*]] |
| ; CHECK: [[DEOPT_LOOPEXIT_LOOPEXIT:.*]]: |
| ; CHECK-NEXT: br label %[[DEOPT_LOOPEXIT:.*]] |
| ; CHECK: [[DEOPT_LOOPEXIT_LOOPEXIT7:.*]]: |
| ; CHECK-NEXT: br label %[[DEOPT_LOOPEXIT]] |
| ; CHECK: [[DEOPT_LOOPEXIT_LOOPEXIT9]]: |
| ; CHECK-NEXT: br label %[[DEOPT_LOOPEXIT]] |
| ; CHECK: [[DEOPT_LOOPEXIT]]: |
| ; CHECK-NEXT: br label %[[DEOPT]] |
| ; CHECK: [[DEOPT]]: |
| ; CHECK-NEXT: call void @deopt() |
| ; CHECK-NEXT: unreachable |
| ; CHECK: [[EXIT_LOOPEXIT_LOOPEXIT:.*]]: |
| ; CHECK-NEXT: br label %[[EXIT_LOOPEXIT]] |
| ; CHECK: [[EXIT_LOOPEXIT]]: |
| ; CHECK-NEXT: br label %[[EXIT]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: [[RET_OP:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ 1, %[[EXIT_LOOPEXIT]] ] |
| ; CHECK-NEXT: ret i32 [[RET_OP]] |
| ; CHECK: [[LOOP__PRELOOP]]: |
| ; CHECK-NEXT: [[IV_PRELOOP:%.*]] = phi i32 [ [[IV_NEXT_PRELOOP:%.*]], %[[GUARDED_PRELOOP:.*]] ], [ [[INDVAR_START]], %[[LOOP__PRELOOP_PREHEADER]] ] |
| ; CHECK-NEXT: [[IV_NEXT_PRELOOP]] = add nuw nsw i32 [[IV_PRELOOP]], 1 |
| ; CHECK-NEXT: [[RANGE_CHECK_PRELOOP:%.*]] = icmp ult i32 [[IV_NEXT_PRELOOP]], [[LENGTH]] |
| ; CHECK-NEXT: br i1 [[RANGE_CHECK_PRELOOP]], label %[[GUARDED_PRELOOP]], label %[[DEOPT_LOOPEXIT_LOOPEXIT]] |
| ; CHECK: [[GUARDED_PRELOOP]]: |
| ; CHECK-NEXT: [[EXIT_CHECK_PRELOOP:%.*]] = icmp slt i32 [[IV_NEXT_PRELOOP]], [[LIMIT]] |
| ; CHECK-NEXT: [[TMP9:%.*]] = icmp slt i32 [[IV_NEXT_PRELOOP]], [[EXIT_PRELOOP_AT]] |
| ; CHECK-NEXT: br i1 [[TMP9]], label %[[LOOP__PRELOOP]], label %[[PRELOOP_EXIT_SELECTOR:.*]], !llvm.loop [[LOOP0:![0-9]+]], !loop_constrainer.loop.clone [[META5:![0-9]+]] |
| ; CHECK: [[PRELOOP_EXIT_SELECTOR]]: |
| ; CHECK-NEXT: [[IV_NEXT_PRELOOP_LCSSA:%.*]] = phi i32 [ [[IV_NEXT_PRELOOP]], %[[GUARDED_PRELOOP]] ] |
| ; CHECK-NEXT: [[TMP10:%.*]] = icmp slt i32 [[IV_NEXT_PRELOOP_LCSSA]], [[LIMIT]] |
| ; CHECK-NEXT: br i1 [[TMP10]], label %[[PRELOOP_PSEUDO_EXIT]], label %[[EXIT_LOOPEXIT]] |
| ; CHECK: [[PRELOOP_PSEUDO_EXIT]]: |
| ; CHECK-NEXT: [[IV_PRELOOP_COPY]] = phi i32 [ [[INDVAR_START]], %[[LOOP__PREHEADER]] ], [ [[IV_NEXT_PRELOOP_LCSSA]], %[[PRELOOP_EXIT_SELECTOR]] ] |
| ; CHECK-NEXT: [[INDVAR_END]] = phi i32 [ [[INDVAR_START]], %[[LOOP__PREHEADER]] ], [ [[IV_NEXT_PRELOOP_LCSSA]], %[[PRELOOP_EXIT_SELECTOR]] ] |
| ; CHECK-NEXT: br label %[[MAINLOOP]] |
| ; CHECK: [[POSTLOOP]]: |
| ; CHECK-NEXT: br label %[[LOOP__POSTLOOP:.*]] |
| ; CHECK: [[LOOP__POSTLOOP]]: |
| ; CHECK-NEXT: [[IV_POSTLOOP:%.*]] = phi i32 [ [[IV_NEXT_POSTLOOP:%.*]], %[[GUARDED_POSTLOOP:.*]] ], [ [[IV_COPY]], %[[POSTLOOP]] ] |
| ; CHECK-NEXT: [[IV_NEXT_POSTLOOP]] = add nuw nsw i32 [[IV_POSTLOOP]], 1 |
| ; CHECK-NEXT: [[RANGE_CHECK_POSTLOOP:%.*]] = icmp ult i32 [[IV_NEXT_POSTLOOP]], [[LENGTH]] |
| ; CHECK-NEXT: br i1 [[RANGE_CHECK_POSTLOOP]], label %[[GUARDED_POSTLOOP]], label %[[DEOPT_LOOPEXIT_LOOPEXIT7]] |
| ; CHECK: [[GUARDED_POSTLOOP]]: |
| ; CHECK-NEXT: [[EXIT_CHECK_POSTLOOP:%.*]] = icmp slt i32 [[IV_NEXT_POSTLOOP]], [[LIMIT]] |
| ; CHECK-NEXT: br i1 [[EXIT_CHECK_POSTLOOP]], label %[[LOOP__POSTLOOP]], label %[[EXIT_LOOPEXIT_LOOPEXIT]], !llvm.loop [[LOOP6:![0-9]+]], !loop_constrainer.loop.clone [[META5]] |
| ; |
| entry: |
| %check0 = icmp eq i32 %limit, 0 |
| br i1 %check0, label %exit, label %preheader |
| |
| preheader: ; preds = %entry |
| %pre_check = icmp slt i32 %start, %limit |
| br i1 %pre_check, label %loop_, label %deopt |
| |
| loop_: ; preds = %guarded, %preheader |
| %iv = phi i32 [ %iv.next, %guarded ], [ %start, %preheader ] |
| %iv.next = add nuw nsw i32 %iv, 1 |
| %range_check = icmp ult i32 %iv.next, %length |
| br i1 %range_check, label %guarded, label %deopt |
| |
| guarded: ; preds = %loop_ |
| %exit_check = icmp slt i32 %iv.next, %limit |
| br i1 %exit_check, label %loop_, label %exit |
| |
| deopt: |
| call void @deopt() |
| unreachable |
| |
| exit: ; preds = %guarded, %loop_, %preheader, %entry |
| %ret.op = phi i32 [ 0, %entry ], [ 1, %guarded ] |
| ret i32 %ret.op |
| } |
| ;. |
| ; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]], [[META3:![0-9]+]], [[META4:![0-9]+]]} |
| ; CHECK: [[META1]] = !{!"llvm.loop.unroll.disable"} |
| ; CHECK: [[META2]] = !{!"llvm.loop.vectorize.enable", i1 false} |
| ; CHECK: [[META3]] = !{!"llvm.loop.licm_versioning.disable"} |
| ; CHECK: [[META4]] = !{!"llvm.loop.distribute.enable", i1 false} |
| ; CHECK: [[META5]] = !{} |
| ; CHECK: [[LOOP6]] = distinct !{[[LOOP6]], [[META1]], [[META2]], [[META3]], [[META4]]} |
| ;. |
