1 ; RUN: llc -O0 < %s | FileCheck %s
2 ; RUN: llc --try-experimental-debuginfo-iterators -O0 < %s | FileCheck %s
4 target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
5 target triple = "i386-linux-gnu"
7 ; Try some simple cases that show how local value sinking improves line tables.
9 @sink_across = external dso_local global i32
11 declare void @simple_callee(i32, i32)
13 define void @simple() !dbg !5 {
14 store i32 44, ptr @sink_across, !dbg !7
15 call void @simple_callee(i32 13, i32 55), !dbg !8
19 ; CHECK-LABEL: simple:
20 ; CHECK-NOT: movl $13,
21 ; CHECK: .loc 1 1 1 prologue_end
22 ; CHECK: movl $44, sink_across
26 ; CHECK: calll simple_callee
28 declare void @simple_reg_callee(i32 inreg, i32 inreg)
30 define void @simple_reg() !dbg !10 {
31 store i32 44, ptr @sink_across, !dbg !11
32 call void @simple_reg_callee(i32 inreg 13, i32 inreg 55), !dbg !12
36 ; CHECK-LABEL: simple_reg:
37 ; CHECK: .loc 1 4 1 prologue_end
38 ; CHECK: movl $44, sink_across
42 ; CHECK: calll simple_reg_callee
44 ; There are two interesting cases where local values have no uses but are not
45 ; dead: when the local value is directly used by a phi, and when the local
46 ; value is used by a no-op cast instruction. In these cases, we get side tables
47 ; referring to the local value vreg that we need to check.
49 define ptr @phi_const(i32 %c) !dbg !14 {
51 %tobool = icmp eq i32 %c, 0, !dbg !20
52 call void @llvm.dbg.value(metadata i1 %tobool, metadata !16, metadata !DIExpression()), !dbg !20
53 br i1 %tobool, label %if.else, label %if.then, !dbg !21
55 if.then: ; preds = %entry
56 br label %if.end, !dbg !22
58 if.else: ; preds = %entry
59 br label %if.end, !dbg !23
61 if.end: ; preds = %if.else, %if.then
62 %r.0 = phi ptr [ inttoptr (i32 42 to ptr), %if.then ], [ inttoptr (i32 1 to ptr), %if.else ], !dbg !24
63 call void @llvm.dbg.value(metadata ptr %r.0, metadata !18, metadata !DIExpression()), !dbg !24
64 ret ptr %r.0, !dbg !25
67 ; CHECK-LABEL: phi_const:
77 define ptr @phi_const_cast(i32 %c) !dbg !26 {
79 %tobool = icmp eq i32 %c, 0, !dbg !32
80 call void @llvm.dbg.value(metadata i1 %tobool, metadata !28, metadata !DIExpression()), !dbg !32
81 br i1 %tobool, label %if.else, label %if.then, !dbg !33
83 if.then: ; preds = %entry
84 %v42 = inttoptr i32 42 to ptr, !dbg !34
85 call void @llvm.dbg.value(metadata ptr %v42, metadata !29, metadata !DIExpression()), !dbg !34
86 br label %if.end, !dbg !35
88 if.else: ; preds = %entry
89 %v1 = inttoptr i32 1 to ptr, !dbg !36
90 call void @llvm.dbg.value(metadata ptr %v1, metadata !30, metadata !DIExpression()), !dbg !36
91 br label %if.end, !dbg !37
93 if.end: ; preds = %if.else, %if.then
94 %r.0 = phi ptr [ %v42, %if.then ], [ %v1, %if.else ], !dbg !38
95 call void @llvm.dbg.value(metadata ptr %r.0, metadata !31, metadata !DIExpression()), !dbg !38
96 ret ptr %r.0, !dbg !39
99 ; CHECK-LABEL: phi_const_cast:
103 ; CHECK: movl $42, %[[REG:[a-z]+]]
104 ; CHECK: #DEBUG_VALUE: phi_const_cast:4 <- $[[REG]]
107 ; CHECK: movl $1, %[[REG:[a-z]+]]
108 ; CHECK: #DEBUG_VALUE: phi_const_cast:5 <- $[[REG]]
111 declare void @may_throw() local_unnamed_addr #1
113 declare i32 @__gxx_personality_v0(...)
115 define i32 @invoke_phi() personality ptr @__gxx_personality_v0 {
117 store i32 42, ptr @sink_across
118 invoke void @may_throw()
119 to label %try.cont unwind label %lpad
121 lpad: ; preds = %entry
122 %0 = landingpad { ptr, i32 }
124 store i32 42, ptr @sink_across
127 try.cont: ; preds = %entry, %lpad
128 %r.0 = phi i32 [ 13, %entry ], [ 55, %lpad ]
132 ; The constant materialization should be *after* the stores to sink_across, but
133 ; before any EH_LABEL.
135 ; CHECK-LABEL: invoke_phi:
136 ; CHECK: movl $42, sink_across
137 ; CHECK: movl $13, %{{[a-z]*}}
138 ; CHECK: .Ltmp{{.*}}:
139 ; CHECK: calll may_throw
140 ; CHECK: .Ltmp{{.*}}:
141 ; CHECK: jmp .LBB{{.*}}
142 ; CHECK: .LBB{{.*}}: # %lpad
143 ; CHECK: movl $42, sink_across
144 ; CHECK: movl $55, %{{[a-z]*}}
145 ; CHECK: .LBB{{.*}}: # %try.cont
149 define i32 @lpad_phi() personality ptr @__gxx_personality_v0 {
151 store i32 42, ptr @sink_across
152 invoke void @may_throw()
153 to label %try.cont unwind label %lpad
155 lpad: ; preds = %entry
156 %p = phi i32 [ 11, %entry ] ; Trivial, but -O0 keeps it
157 %0 = landingpad { ptr, i32 }
159 store i32 %p, ptr @sink_across
162 try.cont: ; preds = %entry, %lpad
163 %r.0 = phi i32 [ 13, %entry ], [ 55, %lpad ]
167 ; The constant materialization should be *after* the stores to sink_across, but
168 ; before any EH_LABEL.
170 ; CHECK-LABEL: lpad_phi:
171 ; CHECK: movl $42, sink_across
172 ; CHECK: movl $13, %{{[a-z]*}}
173 ; CHECK: .Ltmp{{.*}}:
174 ; CHECK: calll may_throw
175 ; CHECK: .Ltmp{{.*}}:
176 ; CHECK: jmp .LBB{{.*}}
177 ; CHECK: .LBB{{.*}}: # %lpad
178 ; CHECK-NEXT: .Ltmp{{.*}}:
179 ; CHECK: movl {{.*}}, sink_across
180 ; CHECK: movl $55, %{{[a-z]*}}
181 ; CHECK: .LBB{{.*}}: # %try.cont
185 ; Function Attrs: nounwind readnone speculatable
186 declare void @llvm.dbg.value(metadata, metadata, metadata) #0
188 attributes #0 = { nounwind readnone speculatable }
191 !llvm.debugify = !{!3, !4}
192 !llvm.module.flags = !{!52, !53}
194 !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
195 !1 = !DIFile(filename: "../llvm/test/CodeGen/X86/sink-local-value.ll", directory: "/")
199 !5 = distinct !DISubprogram(name: "simple", linkageName: "simple", scope: null, file: !1, line: 1, type: !6, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
200 !6 = !DISubroutineType(types: !2)
201 !7 = !DILocation(line: 1, column: 1, scope: !5)
202 !8 = !DILocation(line: 2, column: 1, scope: !5)
203 !9 = !DILocation(line: 3, column: 1, scope: !5)
204 !10 = distinct !DISubprogram(name: "simple_reg", linkageName: "simple_reg", scope: null, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true, scopeLine: 4, isOptimized: true, unit: !0, retainedNodes: !2)
205 !11 = !DILocation(line: 4, column: 1, scope: !10)
206 !12 = !DILocation(line: 5, column: 1, scope: !10)
207 !13 = !DILocation(line: 6, column: 1, scope: !10)
208 !14 = distinct !DISubprogram(name: "phi_const", linkageName: "phi_const", scope: null, file: !1, line: 7, type: !6, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !0, retainedNodes: !15)
210 !16 = !DILocalVariable(name: "1", scope: !14, file: !1, line: 7, type: !17)
211 !17 = !DIBasicType(name: "ty8", size: 8, encoding: DW_ATE_unsigned)
212 !18 = !DILocalVariable(name: "2", scope: !14, file: !1, line: 11, type: !19)
213 !19 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
214 !20 = !DILocation(line: 7, column: 1, scope: !14)
215 !21 = !DILocation(line: 8, column: 1, scope: !14)
216 !22 = !DILocation(line: 9, column: 1, scope: !14)
217 !23 = !DILocation(line: 10, column: 1, scope: !14)
218 !24 = !DILocation(line: 11, column: 1, scope: !14)
219 !25 = !DILocation(line: 12, column: 1, scope: !14)
220 !26 = distinct !DISubprogram(name: "phi_const_cast", linkageName: "phi_const_cast", scope: null, file: !1, line: 13, type: !6, isLocal: false, isDefinition: true, scopeLine: 13, isOptimized: true, unit: !0, retainedNodes: !27)
221 !27 = !{!28, !29, !30, !31}
222 !28 = !DILocalVariable(name: "3", scope: !26, file: !1, line: 13, type: !17)
223 !29 = !DILocalVariable(name: "4", scope: !26, file: !1, line: 15, type: !19)
224 !30 = !DILocalVariable(name: "5", scope: !26, file: !1, line: 17, type: !19)
225 !31 = !DILocalVariable(name: "6", scope: !26, file: !1, line: 19, type: !19)
226 !32 = !DILocation(line: 13, column: 1, scope: !26)
227 !33 = !DILocation(line: 14, column: 1, scope: !26)
228 !34 = !DILocation(line: 15, column: 1, scope: !26)
229 !35 = !DILocation(line: 16, column: 1, scope: !26)
230 !36 = !DILocation(line: 17, column: 1, scope: !26)
231 !37 = !DILocation(line: 18, column: 1, scope: !26)
232 !38 = !DILocation(line: 19, column: 1, scope: !26)
233 !39 = !DILocation(line: 20, column: 1, scope: !26)
234 !40 = distinct !DISubprogram(name: "invoke_phi", linkageName: "invoke_phi", scope: null, file: !1, line: 21, type: !6, isLocal: false, isDefinition: true, scopeLine: 21, isOptimized: true, unit: !0, retainedNodes: !41)
236 !42 = !DILocalVariable(name: "7", scope: !40, file: !1, line: 23, type: !43)
237 !43 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
238 !44 = !DILocalVariable(name: "8", scope: !40, file: !1, line: 26, type: !19)
239 !45 = !DILocation(line: 21, column: 1, scope: !40)
240 !46 = !DILocation(line: 22, column: 1, scope: !40)
241 !47 = !DILocation(line: 23, column: 1, scope: !40)
242 !48 = !DILocation(line: 24, column: 1, scope: !40)
243 !49 = !DILocation(line: 25, column: 1, scope: !40)
244 !50 = !DILocation(line: 26, column: 1, scope: !40)
245 !51 = !DILocation(line: 27, column: 1, scope: !40)
246 !52 = !{i32 2, !"Dwarf Version", i32 4}
247 !53 = !{i32 2, !"Debug Info Version", i32 3}