1 ; RUN: llc -fast-isel-sink-local-values -O0 < %s | FileCheck %s
3 target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
4 target triple = "i386-linux-gnu"
6 ; Try some simple cases that show how local value sinking improves line tables.
8 @sink_across = external global i32
10 declare void @simple_callee(i32, i32)
12 define void @simple() !dbg !5 {
13 store i32 44, i32* @sink_across, !dbg !7
14 call void @simple_callee(i32 13, i32 55), !dbg !8
18 ; CHECK-LABEL: simple:
19 ; CHECK-NOT: movl $13,
20 ; CHECK: .loc 1 1 1 prologue_end
21 ; CHECK: movl $44, sink_across
25 ; CHECK: calll simple_callee
27 declare void @simple_reg_callee(i32 inreg, i32 inreg)
29 define void @simple_reg() !dbg !10 {
30 store i32 44, i32* @sink_across, !dbg !11
31 call void @simple_reg_callee(i32 inreg 13, i32 inreg 55), !dbg !12
35 ; CHECK-LABEL: simple_reg:
36 ; CHECK: .loc 1 4 1 prologue_end
37 ; CHECK: movl $44, sink_across
41 ; CHECK: calll simple_reg_callee
43 ; There are two interesting cases where local values have no uses but are not
44 ; dead: when the local value is directly used by a phi, and when the local
45 ; value is used by a no-op cast instruction. In these cases, we get side tables
46 ; referring to the local value vreg that we need to check.
48 define i8* @phi_const(i32 %c) !dbg !14 {
50 %tobool = icmp eq i32 %c, 0, !dbg !20
51 call void @llvm.dbg.value(metadata i1 %tobool, metadata !16, metadata !DIExpression()), !dbg !20
52 br i1 %tobool, label %if.else, label %if.then, !dbg !21
54 if.then: ; preds = %entry
55 br label %if.end, !dbg !22
57 if.else: ; preds = %entry
58 br label %if.end, !dbg !23
60 if.end: ; preds = %if.else, %if.then
61 %r.0 = phi i8* [ inttoptr (i32 42 to i8*), %if.then ], [ inttoptr (i32 1 to i8*), %if.else ], !dbg !24
62 call void @llvm.dbg.value(metadata i8* %r.0, metadata !18, metadata !DIExpression()), !dbg !24
63 ret i8* %r.0, !dbg !25
66 ; CHECK-LABEL: phi_const:
76 define i8* @phi_const_cast(i32 %c) !dbg !26 {
78 %tobool = icmp eq i32 %c, 0, !dbg !32
79 call void @llvm.dbg.value(metadata i1 %tobool, metadata !28, metadata !DIExpression()), !dbg !32
80 br i1 %tobool, label %if.else, label %if.then, !dbg !33
82 if.then: ; preds = %entry
83 %v42 = inttoptr i32 42 to i8*, !dbg !34
84 call void @llvm.dbg.value(metadata i8* %v42, metadata !29, metadata !DIExpression()), !dbg !34
85 br label %if.end, !dbg !35
87 if.else: ; preds = %entry
88 %v1 = inttoptr i32 1 to i8*, !dbg !36
89 call void @llvm.dbg.value(metadata i8* %v1, metadata !30, metadata !DIExpression()), !dbg !36
90 br label %if.end, !dbg !37
92 if.end: ; preds = %if.else, %if.then
93 %r.0 = phi i8* [ %v42, %if.then ], [ %v1, %if.else ], !dbg !38
94 call void @llvm.dbg.value(metadata i8* %r.0, metadata !31, metadata !DIExpression()), !dbg !38
95 ret i8* %r.0, !dbg !39
98 ; CHECK-LABEL: phi_const_cast:
102 ; CHECK: movl $42, %[[REG:[a-z]+]]
103 ; CHECK: #DEBUG_VALUE: phi_const_cast:4 <- $[[REG]]
106 ; CHECK: movl $1, %[[REG:[a-z]+]]
107 ; CHECK: #DEBUG_VALUE: phi_const_cast:5 <- $[[REG]]
110 declare void @may_throw() local_unnamed_addr #1
112 declare i32 @__gxx_personality_v0(...)
114 define i32 @invoke_phi() personality i32 (...)* @__gxx_personality_v0 {
116 store i32 42, i32* @sink_across
117 invoke void @may_throw()
118 to label %try.cont unwind label %lpad
120 lpad: ; preds = %entry
121 %0 = landingpad { i8*, i32 }
123 store i32 42, i32* @sink_across
126 try.cont: ; preds = %entry, %lpad
127 %r.0 = phi i32 [ 13, %entry ], [ 55, %lpad ]
131 ; The constant materialization should be *after* the stores to sink_across, but
132 ; before any EH_LABEL.
134 ; CHECK-LABEL: invoke_phi:
135 ; CHECK: movl $42, sink_across
136 ; CHECK: movl $13, %{{[a-z]*}}
137 ; CHECK: .Ltmp{{.*}}:
138 ; CHECK: calll may_throw
139 ; CHECK: .Ltmp{{.*}}:
140 ; CHECK: jmp .LBB{{.*}}
141 ; CHECK: .LBB{{.*}}: # %lpad
142 ; CHECK: movl $42, sink_across
143 ; CHECK: movl $55, %{{[a-z]*}}
144 ; CHECK: .LBB{{.*}}: # %try.cont
148 ; Function Attrs: nounwind readnone speculatable
149 declare void @llvm.dbg.value(metadata, metadata, metadata) #0
151 attributes #0 = { nounwind readnone speculatable }
154 !llvm.debugify = !{!3, !4}
155 !llvm.module.flags = !{!52, !53}
157 !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
158 !1 = !DIFile(filename: "../llvm/test/CodeGen/X86/sink-local-value.ll", directory: "/")
162 !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)
163 !6 = !DISubroutineType(types: !2)
164 !7 = !DILocation(line: 1, column: 1, scope: !5)
165 !8 = !DILocation(line: 2, column: 1, scope: !5)
166 !9 = !DILocation(line: 3, column: 1, scope: !5)
167 !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)
168 !11 = !DILocation(line: 4, column: 1, scope: !10)
169 !12 = !DILocation(line: 5, column: 1, scope: !10)
170 !13 = !DILocation(line: 6, column: 1, scope: !10)
171 !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)
173 !16 = !DILocalVariable(name: "1", scope: !14, file: !1, line: 7, type: !17)
174 !17 = !DIBasicType(name: "ty8", size: 8, encoding: DW_ATE_unsigned)
175 !18 = !DILocalVariable(name: "2", scope: !14, file: !1, line: 11, type: !19)
176 !19 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
177 !20 = !DILocation(line: 7, column: 1, scope: !14)
178 !21 = !DILocation(line: 8, column: 1, scope: !14)
179 !22 = !DILocation(line: 9, column: 1, scope: !14)
180 !23 = !DILocation(line: 10, column: 1, scope: !14)
181 !24 = !DILocation(line: 11, column: 1, scope: !14)
182 !25 = !DILocation(line: 12, column: 1, scope: !14)
183 !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)
184 !27 = !{!28, !29, !30, !31}
185 !28 = !DILocalVariable(name: "3", scope: !26, file: !1, line: 13, type: !17)
186 !29 = !DILocalVariable(name: "4", scope: !26, file: !1, line: 15, type: !19)
187 !30 = !DILocalVariable(name: "5", scope: !26, file: !1, line: 17, type: !19)
188 !31 = !DILocalVariable(name: "6", scope: !26, file: !1, line: 19, type: !19)
189 !32 = !DILocation(line: 13, column: 1, scope: !26)
190 !33 = !DILocation(line: 14, column: 1, scope: !26)
191 !34 = !DILocation(line: 15, column: 1, scope: !26)
192 !35 = !DILocation(line: 16, column: 1, scope: !26)
193 !36 = !DILocation(line: 17, column: 1, scope: !26)
194 !37 = !DILocation(line: 18, column: 1, scope: !26)
195 !38 = !DILocation(line: 19, column: 1, scope: !26)
196 !39 = !DILocation(line: 20, column: 1, scope: !26)
197 !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)
199 !42 = !DILocalVariable(name: "7", scope: !40, file: !1, line: 23, type: !43)
200 !43 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
201 !44 = !DILocalVariable(name: "8", scope: !40, file: !1, line: 26, type: !19)
202 !45 = !DILocation(line: 21, column: 1, scope: !40)
203 !46 = !DILocation(line: 22, column: 1, scope: !40)
204 !47 = !DILocation(line: 23, column: 1, scope: !40)
205 !48 = !DILocation(line: 24, column: 1, scope: !40)
206 !49 = !DILocation(line: 25, column: 1, scope: !40)
207 !50 = !DILocation(line: 26, column: 1, scope: !40)
208 !51 = !DILocation(line: 27, column: 1, scope: !40)
209 !52 = !{i32 2, !"Dwarf Version", i32 4}
210 !53 = !{i32 2, !"Debug Info Version", i32 3}