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llvm-project/llvm/test/DebugInfo/X86/live-debug-values.ll
Guozhi Wei cbdccb30c2 [RA] Split a virtual register in cold blocks if it is not assigned preferred physical register 
If a virtual register is not assigned preferred physical register, it means some
COPY instructions will be changed to real register move instructions. In this
case we can try to split the virtual register in colder blocks, if success, the
original COPY instructions can be deleted, and the new COPY instructions in
colder blocks will be generated as register move instructions. It results in
fewer dynamic register move instructions executed.

The new test case split-reg-with-hint.ll gives an example, the hot path contains
24 instructions without this patch, now it is only 4 instructions with this
patch.

Differential Revision: https://reviews.llvm.org/D156491
2023-09-15 19:52:50 +00:00

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; RUN: llc -filetype=asm %s -o - -experimental-debug-variable-locations=false | FileCheck %s
; RUN: llc -filetype=asm %s -o - -experimental-debug-variable-locations=true | FileCheck %s --check-prefixes=CHECK,INSTRREF
; Test the extension of debug ranges from predecessors.
; Generated from the source file LiveDebugValues.c:
; #include <stdio.h>
; int m;
; extern int inc(int n);
; extern int change(int n);
; extern int modify(int n);
; int main(int argc, char **argv) {
; int n;
; if (argc != 2)
; n = 2;
; else
; n = atoi(argv[1]);
; n = change(n);
; if (n > 10) {
; m = modify(n);
; m = m + n; // var `m' doesn't has a dbg.value
; }
; else
; m = inc(n); // var `m' doesn't has a dbg.value
; printf("m(main): %d\n", m);
; return 0;
; }
; with clang -g -O3 -emit-llvm -c LiveDebugValues.c -S -o live-debug-values.ll
; This case will also produce multiple locations but only the debug range
; extension is tested here.
; XFAIL: *
; This test is failing after splitting the live range of variable "n" in %bb.3.
; DBG_VALUE for variable "n" is extended into %bb.5 from its predecessors %bb.3
; and %bb.4.
; CHECK: .LBB0_5:
; INSTRREF-NEXT: #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
; INSTRREF-NEXT: #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
; CHECK-NEXT: #DEBUG_VALUE: main:n <- $ebx
; Other register values have been clobbered.
; CHECK-NOT: #DEBUG_VALUE:
; CHECK: movl %e{{..}}, m(%rip)
; ModuleID = 'LiveDebugValues.c'
source_filename = "test/DebugInfo/X86/live-debug-values.ll"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@m = common dso_local global i32 0, align 4, !dbg !0
@.str = private unnamed_addr constant [13 x i8] c"m(main): %d\0A\00", align 1
; Function Attrs: nounwind uwtable
define dso_local i32 @main(i32 %argc, ptr nocapture readonly %argv) #0 !dbg !10 {
entry:
tail call void @llvm.dbg.value(metadata i32 %argc, metadata !17, metadata !20), !dbg !21
tail call void @llvm.dbg.value(metadata ptr %argv, metadata !18, metadata !20), !dbg !22
%cmp = icmp eq i32 %argc, 2, !dbg !24
br i1 %cmp, label %if.else, label %if.end, !dbg !26
if.else: ; preds = %entry
%arrayidx = getelementptr inbounds ptr, ptr %argv, i64 1, !dbg !27
%0 = load ptr, ptr %arrayidx, align 8, !dbg !27, !tbaa !28
%call = tail call i32 (ptr, ...) @atoi(ptr %0) #1, !dbg !32
tail call void @llvm.dbg.value(metadata i32 %call, metadata !19, metadata !20), !dbg !33
br label %if.end
if.end: ; preds = %if.else, %entry
%n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
%call1 = tail call i32 @change(i32 %n.0) #1, !dbg !34
tail call void @llvm.dbg.value(metadata i32 %call1, metadata !19, metadata !20), !dbg !33
%cmp2 = icmp sgt i32 %call1, 10, !dbg !35
br i1 %cmp2, label %if.then.3, label %if.else.5, !dbg !37
if.then.3: ; preds = %if.end
%call4 = tail call i32 @modify(i32 %call1) #1, !dbg !38
%add = add nsw i32 %call4, %call1, !dbg !40
br label %if.end.7, !dbg !41
if.else.5: ; preds = %if.end
%call6 = tail call i32 @inc(i32 %call1) #1, !dbg !42
br label %if.end.7
if.end.7: ; preds = %if.else.5, %if.then.3
%storemerge = phi i32 [ %call6, %if.else.5 ], [ %add, %if.then.3 ]
store i32 %storemerge, ptr @m, align 4, !dbg !43, !tbaa !44
%call8 = tail call i32 (ptr, ...) @printf(ptr nonnull @.str, i32 %storemerge) #1, !dbg !46
ret i32 0, !dbg !47
}
; Function Attrs: nounwind
declare i32 @atoi(...) #1
; Function Attrs: nounwind
declare i32 @change(i32) #1
; Function Attrs: nounwind
declare i32 @modify(i32) #1
; Function Attrs: nounwind
declare i32 @inc(i32) #1
; Function Attrs: nounwind
declare i32 @printf(ptr nocapture readonly, ...) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8}
!llvm.ident = !{!9}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "m", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{!"clang version 3.8.0 (trunk 253049) "}
!10 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 6, type: !11, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !16)
!11 = !DISubroutineType(types: !12)
!12 = !{!6, !6, !13}
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64, align: 64)
!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64, align: 64)
!15 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!16 = !{!17, !18, !19}
!17 = !DILocalVariable(name: "argc", arg: 1, scope: !10, file: !3, line: 6, type: !6)
!18 = !DILocalVariable(name: "argv", arg: 2, scope: !10, file: !3, line: 6, type: !13)
!19 = !DILocalVariable(name: "n", scope: !10, file: !3, line: 7, type: !6)
!20 = !DIExpression()
!21 = !DILocation(line: 6, column: 14, scope: !10)
!22 = !DILocation(line: 6, column: 27, scope: !23)
!23 = !DILexicalBlockFile(scope: !10, file: !3, discriminator: 1)
!24 = !DILocation(line: 8, column: 12, scope: !25)
!25 = distinct !DILexicalBlock(scope: !10, file: !3, line: 8, column: 7)
!26 = !DILocation(line: 8, column: 7, scope: !10)
!27 = !DILocation(line: 11, column: 14, scope: !25)
!28 = !{!29, !29, i64 0}
!29 = !{!"any pointer", !30, i64 0}
!30 = !{!"omnipotent char", !31, i64 0}
!31 = !{!"Simple C/C++ TBAA"}
!32 = !DILocation(line: 11, column: 9, scope: !25)
!33 = !DILocation(line: 7, column: 7, scope: !23)
!34 = !DILocation(line: 12, column: 7, scope: !10)
!35 = !DILocation(line: 13, column: 9, scope: !36)
!36 = distinct !DILexicalBlock(scope: !10, file: !3, line: 13, column: 7)
!37 = !DILocation(line: 13, column: 7, scope: !10)
!38 = !DILocation(line: 14, column: 9, scope: !39)
!39 = distinct !DILexicalBlock(scope: !36, file: !3, line: 13, column: 15)
!40 = !DILocation(line: 15, column: 11, scope: !39)
!41 = !DILocation(line: 16, column: 3, scope: !39)
!42 = !DILocation(line: 18, column: 9, scope: !36)
!43 = !DILocation(line: 15, column: 7, scope: !39)
!44 = !{!45, !45, i64 0}
!45 = !{!"int", !30, i64 0}
!46 = !DILocation(line: 19, column: 3, scope: !10)
!47 = !DILocation(line: 20, column: 3, scope: !10)
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