; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2 ; RUN: opt -S -passes=indvars < %s | FileCheck %s ; Check that SCEV is able to recognize and use guards to prove ; conditions gaurding loop entries and backedges. This isn't intended ; to be a comprehensive test of SCEV's simplification capabilities, ; tests directly testing e.g. if SCEV can elide a sext should go ; elsewhere. target datalayout = "n8:16:32:64" declare void @llvm.experimental.guard(i1, ...) declare void @use(i64 %x) define void @test_1(ptr %cond_buf, ptr %len_buf) { ; CHECK-LABEL: define void @test_1 ; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4, !range [[RNG0:![0-9]+]] ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[LOOP]] ] ; CHECK-NEXT: [[IV_INC]] = add nsw i32 [[IV]], 1 ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] ; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp ult i32 [[IV_INC]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ] ; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1 ; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]] ; CHECK: leave: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_buf, !range !{i32 1, i32 2147483648} br label %loop loop: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] %iv.inc = add i32 %iv, 1 %iv.cmp = icmp slt i32 %iv, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ] %iv.inc.cmp = icmp slt i32 %iv.inc, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ] %becond = load volatile i1, ptr %cond_buf br i1 %becond, label %loop, label %leave leave: ret void } define void @test_2(i32 %n, ptr %len_buf) { ; CHECK-LABEL: define void @test_2 ; CHECK-SAME: (i32 [[N:%.*]], ptr [[LEN_BUF:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4, !range [[RNG1:![0-9]+]] ; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[LEN]] to i64 ; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[N]] to i64 ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ] ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1 ; CHECK-NEXT: call void @use(i64 [[INDVARS_IV]]) ; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp ult i64 [[INDVARS_IV_NEXT]], [[TMP0]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ] ; CHECK-NEXT: [[BECOND:%.*]] = icmp ne i64 [[INDVARS_IV]], [[TMP1]] ; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]] ; CHECK: leave: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_buf, !range !{i32 0, i32 2147483648} br label %loop loop: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] %iv.inc = add i32 %iv, 1 %iv.sext = sext i32 %iv to i64 call void @use(i64 %iv.sext) %iv.inc.cmp = icmp slt i32 %iv.inc, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ] %becond = icmp ne i32 %iv, %n br i1 %becond, label %loop, label %leave leave: ret void } define void @test_3(ptr %cond_buf, ptr %len_buf) { ; CHECK-LABEL: define void @test_3 ; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4 ; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LEN]], 0 ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[ENTRY_COND]]) [ "deopt"() ] ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[LOOP]] ] ; CHECK-NEXT: [[IV_INC]] = add nsw i32 [[IV]], 1 ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ] ; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp slt i32 [[IV_INC]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ] ; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1 ; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]] ; CHECK: leave: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_buf %entry.cond = icmp sgt i32 %len, 0 call void(i1, ...) @llvm.experimental.guard(i1 %entry.cond) [ "deopt"() ] br label %loop loop: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] %iv.inc = add i32 %iv, 1 %iv.cmp = icmp slt i32 %iv, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ] %iv.inc.cmp = icmp slt i32 %iv.inc, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ] %becond = load volatile i1, ptr %cond_buf br i1 %becond, label %loop, label %leave leave: ret void } define void @test_4(ptr %cond_buf, ptr %len_buf) { ; CHECK-LABEL: define void @test_4 ; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4 ; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LEN]], 0 ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[ENTRY_COND]]) [ "deopt"() ] ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[BE:%.*]] ] ; CHECK-NEXT: [[IV_INC]] = add i32 [[IV]], 1 ; CHECK-NEXT: [[COND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1 ; CHECK-NEXT: br i1 [[COND]], label [[LEFT:%.*]], label [[BE]] ; CHECK: left: ; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp slt i32 [[IV_INC]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ] ; CHECK-NEXT: br label [[BE]] ; CHECK: be: ; CHECK-NEXT: [[IV_CMP:%.*]] = icmp slt i32 [[IV]], [[LEN]] ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_CMP]]) [ "deopt"() ] ; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1 ; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]] ; CHECK: leave: ; CHECK-NEXT: ret void ; entry: %len = load i32, ptr %len_buf %entry.cond = icmp sgt i32 %len, 0 call void(i1, ...) @llvm.experimental.guard(i1 %entry.cond) [ "deopt"() ] br label %loop loop: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ] %iv.inc = add i32 %iv, 1 %cond = load volatile i1, ptr %cond_buf br i1 %cond, label %left, label %be left: ; Does not dominate the backedge, so cannot be used in the inductive proof %iv.inc.cmp = icmp slt i32 %iv.inc, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ] br label %be be: %iv.cmp = icmp slt i32 %iv, %len call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ] %becond = load volatile i1, ptr %cond_buf br i1 %becond, label %loop, label %leave leave: ret void }