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llvm-mirror/test/CodeGen/X86/dbg-changes-codegen-branch-folding.ll
Duncan P. N. Exon Smith c1be4794ba Revert "Revert "DI: Fold constant arguments into a single MDString"" 
This reverts commit r218918, effectively reapplying r218914 after fixing
an Ocaml bindings test and an Asan crash.  The root cause of the latter
was a tightened-up check in `DILexicalBlock::Verify()`, so I'll file a
PR to investigate who requires the loose check (and why).

Original commit message follows.

--

This patch addresses the first stage of PR17891 by folding constant
arguments together into a single MDString.  Integers are stringified and
a `\0` character is used as a separator.

Part of PR17891.

Note: I've attached my testcases upgrade scripts to the PR.  If I've
just broken your out-of-tree testcases, they might help.

llvm-svn: 219010
2014-10-03 20:01:09 +00:00

205 lines
16 KiB
LLVM
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; RUN: llc -march=x86-64 -mtriple=x86_64-linux < %s | FileCheck %s
; RUN: opt -strip-debug < %s | llc -march=x86-64 -mtriple=x86_64-linux | FileCheck %s
; http://llvm.org/PR19051. Minor code-motion difference with -g.
; Presence of debug info shouldn't affect the codegen. Make sure that
; we generated the same code sequence with and without debug info.
;
; CHECK: callq _Z3fooPcjPKc
; CHECK: callq _Z3fooPcjPKc
; CHECK: leaq (%rsp), %rdi
; CHECK: movl $4, %esi
; CHECK: testl {{%[a-z]+}}, {{%[a-z]+}}
; CHECK: je .LBB0_4
; Regenerate test with this command:
; clang -emit-llvm -S -O2 -g
; from this source:
;
; extern void foo(char *dst,unsigned siz,const char *src);
; extern const char * i2str(int);
;
; struct AAA3 {
; AAA3(const char *value) { foo(text,sizeof(text),value);}
; void operator=(const char *value) { foo(text,sizeof(text),value);}
; operator const char*() const { return text;}
; char text[4];
; };
;
; void bar (int param1,int param2) {
; const char * temp(0);
;
; if (param2) {
; temp = i2str(param2);
; }
; AAA3 var1("");
; AAA3 var2("");
;
; if (param1)
; var2 = "+";
; else
; var2 = "-";
; var1 = "";
; }
%struct.AAA3 = type { [4 x i8] }
@.str = private unnamed_addr constant [1 x i8] zeroinitializer, align 1
@.str1 = private unnamed_addr constant [2 x i8] c"+\00", align 1
@.str2 = private unnamed_addr constant [2 x i8] c"-\00", align 1
; Function Attrs: uwtable
define void @_Z3barii(i32 %param1, i32 %param2) #0 {
entry:
%var1 = alloca %struct.AAA3, align 1
%var2 = alloca %struct.AAA3, align 1
tail call void @llvm.dbg.value(metadata !{i32 %param1}, i64 0, metadata !30, metadata !{metadata !"0x102"}), !dbg !47
tail call void @llvm.dbg.value(metadata !{i32 %param2}, i64 0, metadata !31, metadata !{metadata !"0x102"}), !dbg !47
tail call void @llvm.dbg.value(metadata !48, i64 0, metadata !32, metadata !{metadata !"0x102"}), !dbg !49
%tobool = icmp eq i32 %param2, 0, !dbg !50
br i1 %tobool, label %if.end, label %if.then, !dbg !50
if.then: ; preds = %entry
%call = tail call i8* @_Z5i2stri(i32 %param2), !dbg !52
tail call void @llvm.dbg.value(metadata !{i8* %call}, i64 0, metadata !32, metadata !{metadata !"0x102"}), !dbg !49
br label %if.end, !dbg !54
if.end: ; preds = %entry, %if.then
tail call void @llvm.dbg.value(metadata !{%struct.AAA3* %var1}, i64 0, metadata !33, metadata !{metadata !"0x102"}), !dbg !55
tail call void @llvm.dbg.value(metadata !{%struct.AAA3* %var1}, i64 0, metadata !56, metadata !{metadata !"0x102"}), !dbg !57
tail call void @llvm.dbg.value(metadata !58, i64 0, metadata !59, metadata !{metadata !"0x102"}), !dbg !60
%arraydecay.i = getelementptr inbounds %struct.AAA3* %var1, i64 0, i32 0, i64 0, !dbg !61
call void @_Z3fooPcjPKc(i8* %arraydecay.i, i32 4, i8* getelementptr inbounds ([1 x i8]* @.str, i64 0, i64 0)), !dbg !61
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var2}, i64 0, metadata !34, metadata !{metadata !"0x102"}), !dbg !63
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var2}, i64 0, metadata !64, metadata !{metadata !"0x102"}), !dbg !65
call void @llvm.dbg.value(metadata !58, i64 0, metadata !66, metadata !{metadata !"0x102"}), !dbg !67
%arraydecay.i5 = getelementptr inbounds %struct.AAA3* %var2, i64 0, i32 0, i64 0, !dbg !68
call void @_Z3fooPcjPKc(i8* %arraydecay.i5, i32 4, i8* getelementptr inbounds ([1 x i8]* @.str, i64 0, i64 0)), !dbg !68
%tobool1 = icmp eq i32 %param1, 0, !dbg !69
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var2}, i64 0, metadata !34, metadata !{metadata !"0x102"}), !dbg !63
br i1 %tobool1, label %if.else, label %if.then2, !dbg !69
if.then2: ; preds = %if.end
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var2}, i64 0, metadata !71, metadata !{metadata !"0x102"}), !dbg !73
call void @llvm.dbg.value(metadata !74, i64 0, metadata !75, metadata !{metadata !"0x102"}), !dbg !76
call void @_Z3fooPcjPKc(i8* %arraydecay.i5, i32 4, i8* getelementptr inbounds ([2 x i8]* @.str1, i64 0, i64 0)), !dbg !76
br label %if.end3, !dbg !72
if.else: ; preds = %if.end
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var2}, i64 0, metadata !77, metadata !{metadata !"0x102"}), !dbg !79
call void @llvm.dbg.value(metadata !80, i64 0, metadata !81, metadata !{metadata !"0x102"}), !dbg !82
call void @_Z3fooPcjPKc(i8* %arraydecay.i5, i32 4, i8* getelementptr inbounds ([2 x i8]* @.str2, i64 0, i64 0)), !dbg !82
br label %if.end3
if.end3: ; preds = %if.else, %if.then2
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var1}, i64 0, metadata !33, metadata !{metadata !"0x102"}), !dbg !55
call void @llvm.dbg.value(metadata !{%struct.AAA3* %var1}, i64 0, metadata !83, metadata !{metadata !"0x102"}), !dbg !85
call void @llvm.dbg.value(metadata !58, i64 0, metadata !86, metadata !{metadata !"0x102"}), !dbg !87
call void @_Z3fooPcjPKc(i8* %arraydecay.i, i32 4, i8* getelementptr inbounds ([1 x i8]* @.str, i64 0, i64 0)), !dbg !87
ret void, !dbg !88
}
declare i8* @_Z5i2stri(i32) #1
declare void @_Z3fooPcjPKc(i8*, i32, i8*) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!44, !45}
!llvm.ident = !{!46}
!0 = metadata !{metadata !"0x11\004\00clang version 3.5.0 \001\00\000\00\001", metadata !1, metadata !2, metadata !3, metadata !23, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"dbg-changes-codegen-branch-folding.cpp", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !"0x13\00AAA3\004\0032\008\000\000\000", metadata !1, null, null, metadata !5, null, null, metadata !"_ZTS4AAA3"} ; [ DW_TAG_structure_type ] [AAA3] [line 4, size 32, align 8, offset 0] [def] [from ]
!5 = metadata !{metadata !6, metadata !11, metadata !17, metadata !18}
!6 = metadata !{metadata !"0xd\00text\008\0032\008\000\000", metadata !1, metadata !"_ZTS4AAA3", metadata !7} ; [ DW_TAG_member ] [text] [line 8, size 32, align 8, offset 0] [from ]
!7 = metadata !{metadata !"0x1\00\000\0032\008\000\000", null, null, metadata !8, metadata !9, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 32, align 8, offset 0] [from char]
!8 = metadata !{metadata !"0x24\00char\000\008\008\000\000\006", null, null} ; [ DW_TAG_base_type ] [char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!9 = metadata !{metadata !10}
!10 = metadata !{metadata !"0x21\000\004"} ; [ DW_TAG_subrange_type ] [0, 3]
!11 = metadata !{metadata !"0x2e\00AAA3\00AAA3\00\005\000\000\000\006\00256\001\005", metadata !1, metadata !"_ZTS4AAA3", metadata !12, null, null, null, i32 0, null} ; [ DW_TAG_subprogram ] [line 5] [AAA3]
!12 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !13, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!13 = metadata !{null, metadata !14, metadata !15}
!14 = metadata !{metadata !"0xf\00\000\0064\0064\000\001088", null, null, metadata !"_ZTS4AAA3"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS4AAA3]
!15 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !16} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!16 = metadata !{metadata !"0x26\00\000\000\000\000\000", null, null, metadata !8} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from char]
!17 = metadata !{metadata !"0x2e\00operator=\00operator=\00_ZN4AAA3aSEPKc\006\000\000\000\006\00256\001\006", metadata !1, metadata !"_ZTS4AAA3", metadata !12, null, null, null, i32 0, null} ; [ DW_TAG_subprogram ] [line 6] [operator=]
!18 = metadata !{metadata !"0x2e\00operator const char *\00operator const char *\00_ZNK4AAA3cvPKcEv\007\000\000\000\006\00256\001\007", metadata !1, metadata !"_ZTS4AAA3", metadata !19, null, null, null, i32 0, null} ; [ DW_TAG_subprogram ] [line 7] [operator const char *]
!19 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !20, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!20 = metadata !{metadata !15, metadata !21}
!21 = metadata !{metadata !"0xf\00\000\0064\0064\000\001088", null, null, metadata !22} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from ]
!22 = metadata !{metadata !"0x26\00\000\000\000\000\000", null, null, metadata !"_ZTS4AAA3"} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from _ZTS4AAA3]
!23 = metadata !{metadata !24, metadata !35, metadata !40}
!24 = metadata !{metadata !"0x2e\00bar\00bar\00_Z3barii\0011\000\001\000\006\00256\001\0011", metadata !1, metadata !25, metadata !26, null, void (i32, i32)* @_Z3barii, null, null, metadata !29} ; [ DW_TAG_subprogram ] [line 11] [def] [bar]
!25 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp]
!26 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !27, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!27 = metadata !{null, metadata !28, metadata !28}
!28 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!29 = metadata !{metadata !30, metadata !31, metadata !32, metadata !33, metadata !34}
!30 = metadata !{metadata !"0x101\00param1\0016777227\000", metadata !24, metadata !25, metadata !28} ; [ DW_TAG_arg_variable ] [param1] [line 11]
!31 = metadata !{metadata !"0x101\00param2\0033554443\000", metadata !24, metadata !25, metadata !28} ; [ DW_TAG_arg_variable ] [param2] [line 11]
!32 = metadata !{metadata !"0x100\00temp\0012\000", metadata !24, metadata !25, metadata !15} ; [ DW_TAG_auto_variable ] [temp] [line 12]
!33 = metadata !{metadata !"0x100\00var1\0017\000", metadata !24, metadata !25, metadata !"_ZTS4AAA3"} ; [ DW_TAG_auto_variable ] [var1] [line 17]
!34 = metadata !{metadata !"0x100\00var2\0018\000", metadata !24, metadata !25, metadata !"_ZTS4AAA3"} ; [ DW_TAG_auto_variable ] [var2] [line 18]
!35 = metadata !{metadata !"0x2e\00operator=\00operator=\00_ZN4AAA3aSEPKc\006\000\001\000\006\00256\001\006", metadata !1, metadata !"_ZTS4AAA3", metadata !12, null, null, null, metadata !17, metadata !36} ; [ DW_TAG_subprogram ] [line 6] [def] [operator=]
!36 = metadata !{metadata !37, metadata !39}
!37 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !35, null, metadata !38} ; [ DW_TAG_arg_variable ] [this] [line 0]
!38 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !"_ZTS4AAA3"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from _ZTS4AAA3]
!39 = metadata !{metadata !"0x101\00value\0033554438\000", metadata !35, metadata !25, metadata !15} ; [ DW_TAG_arg_variable ] [value] [line 6]
!40 = metadata !{metadata !"0x2e\00AAA3\00AAA3\00_ZN4AAA3C2EPKc\005\000\001\000\006\00256\001\005", metadata !1, metadata !"_ZTS4AAA3", metadata !12, null, null, null, metadata !11, metadata !41} ; [ DW_TAG_subprogram ] [line 5] [def] [AAA3]
!41 = metadata !{metadata !42, metadata !43}
!42 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !40, null, metadata !38} ; [ DW_TAG_arg_variable ] [this] [line 0]
!43 = metadata !{metadata !"0x101\00value\0033554437\000", metadata !40, metadata !25, metadata !15} ; [ DW_TAG_arg_variable ] [value] [line 5]
!44 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!45 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
!46 = metadata !{metadata !"clang version 3.5.0 "}
!47 = metadata !{i32 11, i32 0, metadata !24, null}
!48 = metadata !{i8* null}
!49 = metadata !{i32 12, i32 0, metadata !24, null}
!50 = metadata !{i32 14, i32 0, metadata !51, null}
!51 = metadata !{metadata !"0xb\0014\000\000", metadata !1, metadata !24} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp]
!52 = metadata !{i32 15, i32 0, metadata !53, null}
!53 = metadata !{metadata !"0xb\0014\000\000", metadata !1, metadata !51} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp]
!54 = metadata !{i32 16, i32 0, metadata !53, null}
!55 = metadata !{i32 17, i32 0, metadata !24, null}
!56 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !40, null, metadata !38, metadata !55} ; [ DW_TAG_arg_variable ] [this] [line 0]
!57 = metadata !{i32 0, i32 0, metadata !40, metadata !55}
!58 = metadata !{i8* getelementptr inbounds ([1 x i8]* @.str, i64 0, i64 0)}
!59 = metadata !{metadata !"0x101\00value\0033554437\000", metadata !40, metadata !25, metadata !15, metadata !55} ; [ DW_TAG_arg_variable ] [value] [line 5]
!60 = metadata !{i32 5, i32 0, metadata !40, metadata !55}
!61 = metadata !{i32 5, i32 0, metadata !62, metadata !55}
!62 = metadata !{metadata !"0xb\005\000\000", metadata !1, metadata !40} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp]
!63 = metadata !{i32 18, i32 0, metadata !24, null}
!64 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !40, null, metadata !38, metadata !63} ; [ DW_TAG_arg_variable ] [this] [line 0]
!65 = metadata !{i32 0, i32 0, metadata !40, metadata !63}
!66 = metadata !{metadata !"0x101\00value\0033554437\000", metadata !40, metadata !25, metadata !15, metadata !63} ; [ DW_TAG_arg_variable ] [value] [line 5]
!67 = metadata !{i32 5, i32 0, metadata !40, metadata !63}
!68 = metadata !{i32 5, i32 0, metadata !62, metadata !63}
!69 = metadata !{i32 20, i32 0, metadata !70, null}
!70 = metadata !{metadata !"0xb\0020\000\000", metadata !1, metadata !24} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/dbg-changes-codegen-branch-folding.cpp]
!71 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !35, null, metadata !38, metadata !72} ; [ DW_TAG_arg_variable ] [this] [line 0]
!72 = metadata !{i32 21, i32 0, metadata !70, null}
!73 = metadata !{i32 0, i32 0, metadata !35, metadata !72}
!74 = metadata !{i8* getelementptr inbounds ([2 x i8]* @.str1, i64 0, i64 0)}
!75 = metadata !{metadata !"0x101\00value\0033554438\000", metadata !35, metadata !25, metadata !15, metadata !72} ; [ DW_TAG_arg_variable ] [value] [line 6]
!76 = metadata !{i32 6, i32 0, metadata !35, metadata !72}
!77 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !35, null, metadata !38, metadata !78} ; [ DW_TAG_arg_variable ] [this] [line 0]
!78 = metadata !{i32 23, i32 0, metadata !70, null}
!79 = metadata !{i32 0, i32 0, metadata !35, metadata !78}
!80 = metadata !{i8* getelementptr inbounds ([2 x i8]* @.str2, i64 0, i64 0)}
!81 = metadata !{metadata !"0x101\00value\0033554438\000", metadata !35, metadata !25, metadata !15, metadata !78} ; [ DW_TAG_arg_variable ] [value] [line 6]
!82 = metadata !{i32 6, i32 0, metadata !35, metadata !78}
!83 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !35, null, metadata !38, metadata !84} ; [ DW_TAG_arg_variable ] [this] [line 0]
!84 = metadata !{i32 24, i32 0, metadata !24, null}
!85 = metadata !{i32 0, i32 0, metadata !35, metadata !84}
!86 = metadata !{metadata !"0x101\00value\0033554438\000", metadata !35, metadata !25, metadata !15, metadata !84} ; [ DW_TAG_arg_variable ] [value] [line 6]
!87 = metadata !{i32 6, i32 0, metadata !35, metadata !84}
!88 = metadata !{i32 25, i32 0, metadata !24, null}
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