; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3 ; RUN: opt -passes=irce < %s -S | FileCheck %s ; if (K > 0 && M > 0) ; for (i = 0; i < min(K, M); i++) {...} ; ; TODO: Loop bounds are safe according to loop guards. IRCE is allowed. define void @incrementing_loop(ptr %arr, ptr %len_ptr, i32 %K, i32 %M) { ; CHECK-LABEL: define void @incrementing_loop( ; CHECK-SAME: ptr [[ARR:%.*]], ptr [[LEN_PTR:%.*]], i32 [[K:%.*]], i32 [[M:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_PTR]], align 4, !range [[RNG0:![0-9]+]] ; CHECK-NEXT: [[CHECK0:%.*]] = icmp sgt i32 [[K]], 0 ; CHECK-NEXT: [[CHECK1:%.*]] = icmp sgt i32 [[M]], 0 ; CHECK-NEXT: [[AND:%.*]] = and i1 [[CHECK0]], [[CHECK1]] ; CHECK-NEXT: br i1 [[AND]], label [[PREHEADER:%.*]], label [[EXIT:%.*]] ; CHECK: preheader: ; CHECK-NEXT: [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[K]], i32 [[M]]) ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IDX:%.*]] = phi i32 [ 0, [[PREHEADER]] ], [ [[IDX_NEXT:%.*]], [[IN_BOUNDS:%.*]] ] ; CHECK-NEXT: [[IDX_NEXT]] = add i32 [[IDX]], 1 ; CHECK-NEXT: [[GUARD:%.*]] = icmp slt i32 [[IDX]], [[LEN]] ; CHECK-NEXT: br i1 [[GUARD]], label [[IN_BOUNDS]], label [[OUT_OF_BOUNDS:%.*]] ; CHECK: in.bounds: ; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i32, ptr [[ARR]], i32 [[IDX]] ; CHECK-NEXT: store i32 0, ptr [[ADDR]], align 4 ; CHECK-NEXT: [[NEXT:%.*]] = icmp slt i32 [[IDX_NEXT]], [[SMIN]] ; CHECK-NEXT: br i1 [[NEXT]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: out.of.bounds: ; CHECK-NEXT: ret void ; CHECK: exit.loopexit: ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_ptr, !range !0 %check0 = icmp sgt i32 %K, 0 %check1 = icmp sgt i32 %M, 0 %and = and i1 %check0, %check1 br i1 %and, label %preheader, label %exit preheader: %smin = call i32 @llvm.smin.i32(i32 %K, i32 %M) br label %loop loop: %idx = phi i32 [ 0, %preheader ], [ %idx.next, %in.bounds ] %idx.next = add i32 %idx, 1 %guard = icmp slt i32 %idx, %len br i1 %guard, label %in.bounds, label %out.of.bounds in.bounds: %addr = getelementptr i32, ptr %arr, i32 %idx store i32 0, ptr %addr %next = icmp slt i32 %idx.next, %smin br i1 %next, label %loop, label %exit out.of.bounds: ret void exit: ret void } ; if (K > 0 && M > 0) ; for (i = min(K, M); i >= 0; i--) {...} ; ; TODO: Loop bounds are safe according to loop guards. IRCE is allowed. define void @decrementing_loop(ptr %arr, ptr %len_ptr, i32 %K, i32 %M) { ; CHECK-LABEL: define void @decrementing_loop( ; CHECK-SAME: ptr [[ARR:%.*]], ptr [[LEN_PTR:%.*]], i32 [[K:%.*]], i32 [[M:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_PTR]], align 4, !range [[RNG0]] ; CHECK-NEXT: [[CHECK0:%.*]] = icmp sgt i32 [[K]], 0 ; CHECK-NEXT: [[CHECK1:%.*]] = icmp sgt i32 [[M]], 0 ; CHECK-NEXT: [[AND:%.*]] = and i1 [[CHECK0]], [[CHECK1]] ; CHECK-NEXT: br i1 [[AND]], label [[PREHEADER:%.*]], label [[EXIT:%.*]] ; CHECK: preheader: ; CHECK-NEXT: [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[K]], i32 [[M]]) ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IDX:%.*]] = phi i32 [ [[SMIN]], [[PREHEADER]] ], [ [[IDX_DEC:%.*]], [[IN_BOUNDS:%.*]] ] ; CHECK-NEXT: [[IDX_DEC]] = sub i32 [[IDX]], 1 ; CHECK-NEXT: [[GUARD:%.*]] = icmp slt i32 [[IDX]], [[LEN]] ; CHECK-NEXT: br i1 [[GUARD]], label [[IN_BOUNDS]], label [[OUT_OF_BOUNDS:%.*]] ; CHECK: in.bounds: ; CHECK-NEXT: [[ADDR:%.*]] = getelementptr i32, ptr [[ARR]], i32 [[IDX]] ; CHECK-NEXT: store i32 0, ptr [[ADDR]], align 4 ; CHECK-NEXT: [[NEXT:%.*]] = icmp sgt i32 [[IDX_DEC]], -1 ; CHECK-NEXT: br i1 [[NEXT]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] ; CHECK: out.of.bounds: ; CHECK-NEXT: ret void ; CHECK: exit.loopexit: ; CHECK-NEXT: br label [[EXIT]] ; CHECK: exit: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_ptr, !range !0 %check0 = icmp sgt i32 %K, 0 %check1 = icmp sgt i32 %M, 0 %and = and i1 %check0, %check1 br i1 %and, label %preheader, label %exit preheader: %smin = call i32 @llvm.smin.i32(i32 %K, i32 %M) br label %loop loop: %idx = phi i32 [ %smin, %preheader ] , [ %idx.dec, %in.bounds ] %idx.dec = sub i32 %idx, 1 %guard = icmp slt i32 %idx, %len br i1 %guard, label %in.bounds, label %out.of.bounds in.bounds: %addr = getelementptr i32, ptr %arr, i32 %idx store i32 0, ptr %addr %next = icmp sgt i32 %idx.dec, -1 br i1 %next, label %loop, label %exit out.of.bounds: ret void exit: ret void } declare i32 @llvm.smin.i32(i32, i32) !0 = !{i32 0, i32 2147483647}