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llvm-mirror/test/CodeGen/X86/sink-local-value.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

211 lines
8.8 KiB
LLVM
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; RUN: llc -fast-isel-sink-local-values -O0 < %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i386-linux-gnu"
; Try some simple cases that show how local value sinking improves line tables.
@sink_across = external global i32
declare void @simple_callee(i32, i32)
define void @simple() !dbg !5 {
store i32 44, i32* @sink_across, !dbg !7
call void @simple_callee(i32 13, i32 55), !dbg !8
ret void, !dbg !9
}
; CHECK-LABEL: simple:
; CHECK-NOT: movl $13,
; CHECK: .loc 1 1 1 prologue_end
; CHECK: movl $44, sink_across
; CHECK: .loc 1 2 1
; CHECK: movl $13,
; CHECK: movl $55,
; CHECK: calll simple_callee
declare void @simple_reg_callee(i32 inreg, i32 inreg)
define void @simple_reg() !dbg !10 {
store i32 44, i32* @sink_across, !dbg !11
call void @simple_reg_callee(i32 inreg 13, i32 inreg 55), !dbg !12
ret void, !dbg !13
}
; CHECK-LABEL: simple_reg:
; CHECK: .loc 1 4 1 prologue_end
; CHECK: movl $44, sink_across
; CHECK: .loc 1 5 1
; CHECK: movl $13,
; CHECK: movl $55,
; CHECK: calll simple_reg_callee
; There are two interesting cases where local values have no uses but are not
; dead: when the local value is directly used by a phi, and when the local
; value is used by a no-op cast instruction. In these cases, we get side tables
; referring to the local value vreg that we need to check.
define i8* @phi_const(i32 %c) !dbg !14 {
entry:
%tobool = icmp eq i32 %c, 0, !dbg !20
call void @llvm.dbg.value(metadata i1 %tobool, metadata !16, metadata !DIExpression()), !dbg !20
br i1 %tobool, label %if.else, label %if.then, !dbg !21
if.then: ; preds = %entry
br label %if.end, !dbg !22
if.else: ; preds = %entry
br label %if.end, !dbg !23
if.end: ; preds = %if.else, %if.then
%r.0 = phi i8* [ inttoptr (i32 42 to i8*), %if.then ], [ inttoptr (i32 1 to i8*), %if.else ], !dbg !24
call void @llvm.dbg.value(metadata i8* %r.0, metadata !18, metadata !DIExpression()), !dbg !24
ret i8* %r.0, !dbg !25
}
; CHECK-LABEL: phi_const:
; CHECK: # %entry
; CHECK: cmpl $0,
; CHECK: # %if.then
; CHECK: movl $42,
; CHECK: jmp
; CHECK: # %if.else
; CHECK: movl $1,
; CHECK: # %if.end
define i8* @phi_const_cast(i32 %c) !dbg !26 {
entry:
%tobool = icmp eq i32 %c, 0, !dbg !32
call void @llvm.dbg.value(metadata i1 %tobool, metadata !28, metadata !DIExpression()), !dbg !32
br i1 %tobool, label %if.else, label %if.then, !dbg !33
if.then: ; preds = %entry
%v42 = inttoptr i32 42 to i8*, !dbg !34
call void @llvm.dbg.value(metadata i8* %v42, metadata !29, metadata !DIExpression()), !dbg !34
br label %if.end, !dbg !35
if.else: ; preds = %entry
%v1 = inttoptr i32 1 to i8*, !dbg !36
call void @llvm.dbg.value(metadata i8* %v1, metadata !30, metadata !DIExpression()), !dbg !36
br label %if.end, !dbg !37
if.end: ; preds = %if.else, %if.then
%r.0 = phi i8* [ %v42, %if.then ], [ %v1, %if.else ], !dbg !38
call void @llvm.dbg.value(metadata i8* %r.0, metadata !31, metadata !DIExpression()), !dbg !38
ret i8* %r.0, !dbg !39
}
; CHECK-LABEL: phi_const_cast:
; CHECK: # %entry
; CHECK: cmpl $0,
; CHECK: # %if.then
; CHECK: movl $42, %[[REG:[a-z]+]]
; CHECK: #DEBUG_VALUE: phi_const_cast:4 <- $[[REG]]
; CHECK: jmp
; CHECK: # %if.else
; CHECK: movl $1, %[[REG:[a-z]+]]
; CHECK: #DEBUG_VALUE: phi_const_cast:5 <- $[[REG]]
; CHECK: # %if.end
declare void @may_throw() local_unnamed_addr #1
declare i32 @__gxx_personality_v0(...)
define i32 @invoke_phi() personality i32 (...)* @__gxx_personality_v0 {
entry:
store i32 42, i32* @sink_across
invoke void @may_throw()
to label %try.cont unwind label %lpad
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
catch i8* null
store i32 42, i32* @sink_across
br label %try.cont
try.cont: ; preds = %entry, %lpad
%r.0 = phi i32 [ 13, %entry ], [ 55, %lpad ]
ret i32 %r.0
}
; The constant materialization should be *after* the stores to sink_across, but
; before any EH_LABEL.
; CHECK-LABEL: invoke_phi:
; CHECK: movl $42, sink_across
; CHECK: movl $13, %{{[a-z]*}}
; CHECK: .Ltmp{{.*}}:
; CHECK: calll may_throw
; CHECK: .Ltmp{{.*}}:
; CHECK: jmp .LBB{{.*}}
; CHECK: .LBB{{.*}}: # %lpad
; CHECK: movl $42, sink_across
; CHECK: movl $55, %{{[a-z]*}}
; CHECK: .LBB{{.*}}: # %try.cont
; CHECK: retl
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #0
attributes #0 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.debugify = !{!3, !4}
!llvm.module.flags = !{!52, !53}
!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "../llvm/test/CodeGen/X86/sink-local-value.ll", directory: "/")
!2 = !{}
!3 = !{i32 27}
!4 = !{i32 8}
!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)
!6 = !DISubroutineType(types: !2)
!7 = !DILocation(line: 1, column: 1, scope: !5)
!8 = !DILocation(line: 2, column: 1, scope: !5)
!9 = !DILocation(line: 3, column: 1, scope: !5)
!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)
!11 = !DILocation(line: 4, column: 1, scope: !10)
!12 = !DILocation(line: 5, column: 1, scope: !10)
!13 = !DILocation(line: 6, column: 1, scope: !10)
!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)
!15 = !{!16, !18}
!16 = !DILocalVariable(name: "1", scope: !14, file: !1, line: 7, type: !17)
!17 = !DIBasicType(name: "ty8", size: 8, encoding: DW_ATE_unsigned)
!18 = !DILocalVariable(name: "2", scope: !14, file: !1, line: 11, type: !19)
!19 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
!20 = !DILocation(line: 7, column: 1, scope: !14)
!21 = !DILocation(line: 8, column: 1, scope: !14)
!22 = !DILocation(line: 9, column: 1, scope: !14)
!23 = !DILocation(line: 10, column: 1, scope: !14)
!24 = !DILocation(line: 11, column: 1, scope: !14)
!25 = !DILocation(line: 12, column: 1, scope: !14)
!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)
!27 = !{!28, !29, !30, !31}
!28 = !DILocalVariable(name: "3", scope: !26, file: !1, line: 13, type: !17)
!29 = !DILocalVariable(name: "4", scope: !26, file: !1, line: 15, type: !19)
!30 = !DILocalVariable(name: "5", scope: !26, file: !1, line: 17, type: !19)
!31 = !DILocalVariable(name: "6", scope: !26, file: !1, line: 19, type: !19)
!32 = !DILocation(line: 13, column: 1, scope: !26)
!33 = !DILocation(line: 14, column: 1, scope: !26)
!34 = !DILocation(line: 15, column: 1, scope: !26)
!35 = !DILocation(line: 16, column: 1, scope: !26)
!36 = !DILocation(line: 17, column: 1, scope: !26)
!37 = !DILocation(line: 18, column: 1, scope: !26)
!38 = !DILocation(line: 19, column: 1, scope: !26)
!39 = !DILocation(line: 20, column: 1, scope: !26)
!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)
!41 = !{!42, !44}
!42 = !DILocalVariable(name: "7", scope: !40, file: !1, line: 23, type: !43)
!43 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
!44 = !DILocalVariable(name: "8", scope: !40, file: !1, line: 26, type: !19)
!45 = !DILocation(line: 21, column: 1, scope: !40)
!46 = !DILocation(line: 22, column: 1, scope: !40)
!47 = !DILocation(line: 23, column: 1, scope: !40)
!48 = !DILocation(line: 24, column: 1, scope: !40)
!49 = !DILocation(line: 25, column: 1, scope: !40)
!50 = !DILocation(line: 26, column: 1, scope: !40)
!51 = !DILocation(line: 27, column: 1, scope: !40)
!52 = !{i32 2, !"Dwarf Version", i32 4}
!53 = !{i32 2, !"Debug Info Version", i32 3}
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