1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s | FileCheck %s
3 ; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s --try-experimental-debuginfo-iterators | FileCheck %s
5 ;; Check that when we duplicate the load in the loop header, we also duplicate
6 ;; the corresponding dbg.value.
7 ;; FIXME: the hoisted load dominates the duplicated dbg.value, however as it's
8 ;; not subsequently used in the loop, so it doesn't get remapped into the
9 ;; debug user and we get a undef/poison dbg.value. This is suboptimal, but it's
10 ;; important that the dbg.value gets duplicated nonetheless.
12 declare void @clobber()
13 declare void @llvm.dbg.value(metadata, metadata, metadata)
15 define i32 @partial_unswitch_true_successor(ptr %ptr, i32 %N) {
16 ; CHECK-LABEL: @partial_unswitch_true_successor(
18 ; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[PTR:%.*]], align 4
19 ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[TMP0]], 100
20 ; CHECK-NEXT: br i1 [[TMP1]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
21 ; CHECK: entry.split.us:
22 ; CHECK-NEXT: br label [[LOOP_HEADER_US:%.*]]
23 ; CHECK: loop.header.us:
24 ; CHECK-NEXT: [[IV_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[IV_NEXT_US:%.*]], [[LOOP_LATCH_US:%.*]] ]
25 ; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 poison, metadata [[META3:![0-9]+]], metadata !DIExpression()), !dbg [[DBG8:![0-9]+]]
26 ; CHECK-NEXT: br label [[NOCLOBBER_US:%.*]]
27 ; CHECK: noclobber.us:
28 ; CHECK-NEXT: br label [[LOOP_LATCH_US]]
29 ; CHECK: loop.latch.us:
30 ; CHECK-NEXT: [[C_US:%.*]] = icmp ult i32 [[IV_US]], [[N:%.*]]
31 ; CHECK-NEXT: [[IV_NEXT_US]] = add i32 [[IV_US]], 1
32 ; CHECK-NEXT: br i1 [[C_US]], label [[LOOP_HEADER_US]], label [[EXIT_SPLIT_US:%.*]]
33 ; CHECK: exit.split.us:
34 ; CHECK-NEXT: br label [[EXIT:%.*]]
36 ; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
38 ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
39 ; CHECK-NEXT: [[LV:%.*]] = load i32, ptr [[PTR]], align 4
40 ; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[LV]], metadata [[META3]], metadata !DIExpression()), !dbg [[DBG8]]
41 ; CHECK-NEXT: [[SC:%.*]] = icmp eq i32 [[LV]], 100
42 ; CHECK-NEXT: br i1 [[SC]], label [[NOCLOBBER:%.*]], label [[CLOBBER:%.*]]
44 ; CHECK-NEXT: br label [[LOOP_LATCH]]
46 ; CHECK-NEXT: call void @clobber()
47 ; CHECK-NEXT: br label [[LOOP_LATCH]]
49 ; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[IV]], [[N]]
50 ; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
51 ; CHECK-NEXT: br i1 [[C]], label [[LOOP_HEADER]], label [[EXIT_SPLIT:%.*]], !llvm.loop [[LOOP9:![0-9]+]]
53 ; CHECK-NEXT: br label [[EXIT]]
55 ; CHECK-NEXT: ret i32 10
61 %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
62 %lv = load i32, ptr %ptr
63 call void @llvm.dbg.value(metadata i32 %lv, metadata !6, metadata !DIExpression()), !dbg !7
64 %sc = icmp eq i32 %lv, 100
65 br i1 %sc, label %noclobber, label %clobber
75 %c = icmp ult i32 %iv, %N
76 %iv.next = add i32 %iv, 1
77 br i1 %c, label %loop.header, label %exit
83 !llvm.module.flags = !{!21}
86 !0 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !20, scope: !1, type: !3)
87 !1 = !DIFile(filename: "b.c", directory: "/private/tmp")
88 !2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !20)
89 !3 = !DISubroutineType(types: !4)
91 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
92 !6 = !DILocalVariable(name: "i", line: 2, arg: 1, scope: !0, file: !1, type: !5)
93 !7 = !DILocation(line: 2, column: 13, scope: !0)
94 !9 = !DILocalVariable(name: "k", line: 3, scope: !10, file: !1, type: !5)
95 !10 = distinct !DILexicalBlock(line: 2, column: 16, file: !20, scope: !0)
96 !11 = !DILocation(line: 3, column: 12, scope: !10)
97 !12 = !DILocation(line: 4, column: 3, scope: !10)
98 !13 = !DILocation(line: 5, column: 5, scope: !14)
99 !14 = distinct !DILexicalBlock(line: 4, column: 10, file: !20, scope: !10)
100 !15 = !DILocation(line: 6, column: 3, scope: !14)
101 !16 = !DILocation(line: 7, column: 5, scope: !17)
102 !17 = distinct !DILexicalBlock(line: 6, column: 10, file: !20, scope: !10)
103 !18 = !DILocation(line: 8, column: 3, scope: !17)
104 !19 = !DILocation(line: 9, column: 3, scope: !10)
105 !20 = !DIFile(filename: "b.c", directory: "/private/tmp")
106 !21 = !{i32 1, !"Debug Info Version", i32 3}