[llvm] [InstrRef] Preserve debug instr num in aarch64-expand-pseudo LOADgot expansion (PR #128081)
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Thu Feb 20 14:40:18 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-aarch64
Author: Shubham Sandeep Rastogi (rastogishubham)
<details>
<summary>Changes</summary>
The aarch64-expand-pseudo pass expands the LOADgot instruction to an ADRP instruction and a LDRXui instruction. If the LOADgot had a debug-instr-number, the pass doesn't preserve this to the new expansion.
This patch fixes the issue by making sure the debug-instr-number is correctly applied to the LDRXui instruction generated.
---
Full diff: https://github.com/llvm/llvm-project/pull/128081.diff
2 Files Affected:
- (modified) llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp (+5)
- (added) llvm/test/CodeGen/AArch64/expand-load-got-pseudo.mir (+283)
``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp b/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
index b44c48afe705b..55a441b7d22b6 100644
--- a/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
@@ -1382,6 +1382,11 @@ bool AArch64ExpandPseudo::expandMI(MachineBasicBlock &MBB,
AArch64II::MO_NC);
}
+ // If the LOADgot instruction has a debug-instr-number, annotate the
+ // LDRWui instruction that it is expanded to with the same
+ // debug-instr-number to preserve debug information.
+ if (MI.peekDebugInstrNum() != 0)
+ MIB2->setDebugInstrNum(MI.peekDebugInstrNum());
transferImpOps(MI, MIB1, MIB2);
}
MI.eraseFromParent();
diff --git a/llvm/test/CodeGen/AArch64/expand-load-got-pseudo.mir b/llvm/test/CodeGen/AArch64/expand-load-got-pseudo.mir
new file mode 100644
index 0000000000000..f5273d345d216
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/expand-load-got-pseudo.mir
@@ -0,0 +1,283 @@
+# RUN: llc -run-pass=aarch64-expand-pseudo -mtriple=aarch64-unknown-linux-gnu -o - %s | FileCheck %s
+
+# This testcase was obtained by looking at FileCheck.cpp and reducing it down via llvm-reduce
+
+# Check that the LDRXui preserves the debug info by retaining the debug-instr-number 1 in _ZN4llvm12handleErrorsIJZNS_12consumeErrorENS_5ErrorEEUlRKNS_13ErrorInfoBaseEE_EEES1_S1_DpOT_
+# CHECK: $x8 = ADRP target-flags(aarch64-page, aarch64-got) @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev
+# CHECK-NEXT: renamable $x8 = LDRXui killed $x8, target-flags(aarch64-pageoff, aarch64-got, aarch64-nc) @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev, debug-instr-number 1
+# CHECK-NEXT: DBG_INSTR_REF !9, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location
+
+--- |
+ ; ModuleID = '/Users/shubhamrastogi/Development/test105791650/FileCheck-extract-reduced.ll'
+ source_filename = "/Users/shubhamrastogi/Development/test105791650/FileCheck-extract-reduced.ll"
+ target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-n32:64-S128-Fn32"
+ target triple = "arm64-apple-macosx15.0.0"
+
+ declare i64 @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev()
+
+ ; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read)
+ define i1 @_ZNSt3__1neB8nn180100IPNS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEEEEbRKNS_11__wrap_iterIT_EESC_(ptr readnone captures(address) %__x, ptr readonly captures(none) %__y) local_unnamed_addr #0 {
+ %1 = load ptr, ptr %__y, align 8
+ %cmp = icmp eq ptr %__x, %1
+ ret i1 %cmp
+ }
+
+ ; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read)
+ define ptr @_ZNKSt3__111__wrap_iterIPNS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEEE4baseB8nn180100Ev(ptr readonly captures(none) %this) local_unnamed_addr #0 {
+ entry:
+ %0 = load ptr, ptr %this, align 8
+ ret ptr %0
+ }
+
+ ; Function Attrs: mustprogress nofree norecurse nounwind willreturn
+ define void @_ZN4llvm12handleErrorsIJZNS_12consumeErrorENS_5ErrorEEUlRKNS_13ErrorInfoBaseEE_EEES1_S1_DpOT_(ptr readnone captures(address) %call6) local_unnamed_addr #1 !dbg !4 {
+ %call8 = load volatile i64, ptr null, align 4294967296, !dbg !24
+ #dbg_value(ptr @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev, !9, !DIExpression(), !25)
+ %cmp.i = icmp eq ptr %call6, @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev
+ br i1 %cmp.i, label %for.body, label %common.ret
+
+ common.ret: ; preds = %0
+ ret void
+
+ for.body: ; preds = %0
+ tail call void @llvm.lifetime.start.p0(i64 0, ptr null)
+ ret void
+ }
+
+ ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+ declare void @llvm.lifetime.start.p0(i64 immarg, ptr captures(none)) #2
+
+ attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) }
+ attributes #1 = { mustprogress nofree norecurse nounwind willreturn }
+ attributes #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
+
+ !llvm.module.flags = !{!0}
+ !llvm.dbg.cu = !{!1}
+
+ !0 = !{i32 2, !"Debug Info Version", i32 3}
+ !1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !2, producer: "clang version 21.0.0git (\0A\0A\0A\0Agit at github.com:llvm/llvm-project.git 6deee0d5b36c8b4b83209759df8d4933e4922bc8\0A\0A\0A\0A)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, retainedTypes: !3, globals: !3, imports: !3, splitDebugInlining: false, nameTableKind: Apple, sysroot: "/Library/Developer/CommandLineTools/SDKs/MacOSX15.3.sdk", sdk: "MacOSX15.3.sdk")
+ !2 = !DIFile(filename: "/Users/shubhamrastogi/Development/llvm-project-instr-ref/llvm-project/llvm/lib/FileCheck/FileCheck.cpp", directory: "/Users/shubhamrastogi/Development/llvm-project-instr-ref/llvm-project/build-instr-ref-stage2", checksumkind: CSK_MD5, checksum: "e718c2a5b2d3baab240a5e370113901e")
+ !3 = !{}
+ !4 = distinct !DISubprogram(name: "handleErrors<(\0A\0A\0A\0Alambda at /Users/shubhamrastogi/Development/llvm-project-instr-ref/llvm-project/llvm/include/llvm/Support/Error.h:1070:35\0A\0A\0A\0A)>", linkageName: "_ZN4llvm12handleErrorsIJZNS_12consumeErrorENS_5ErrorEEUlRKNS_13ErrorInfoBaseEE_EEES1_S1_DpOT_", scope: !6, file: !5, line: 954, type: !7, scopeLine: 954, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, templateParams: !3, retainedNodes: !8)
+ !5 = !DIFile(filename: "llvm/include/llvm/Support/Error.h", directory: "/Users/shubhamrastogi/Development/llvm-project-instr-ref/llvm-project", checksumkind: CSK_MD5, checksum: "0a75676311531ba2140b3f0d994b3c33")
+ !6 = !DINamespace(name: "llvm", scope: null)
+ !7 = distinct !DISubroutineType(types: !3)
+ !8 = !{!9}
+ !9 = !DILocalVariable(name: "__end3", scope: !10, type: !13, flags: DIFlagArtificial)
+ !10 = distinct !DILexicalBlock(scope: !11, file: !5, line: 963, column: 5)
+ !11 = distinct !DILexicalBlock(scope: !12, file: !5, line: 960, column: 34)
+ !12 = distinct !DILexicalBlock(scope: !4, file: !5, line: 960, column: 7)
+ !13 = !DIDerivedType(tag: DW_TAG_typedef, name: "iterator", scope: !15, file: !14, line: 403, baseType: !18, flags: DIFlagPublic)
+ !14 = !DIFile(filename: "/Library/Developer/CommandLineTools/SDKs/MacOSX15.3.sdk/usr/include/c++/v1/vector", directory: "")
+ !15 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "vector<std::__1::unique_ptr<llvm::ErrorInfoBase,\0A\0A\0A\0Astd::__1::default_delete<llvm::ErrorInfoBase> >,\0A\0A\0A\0Astd::__1::allocator<std::__1::unique_ptr<llvm::ErrorInfoBase,\0A\0A\0A\0Astd::__1::default_delete<llvm::ErrorInfoBase> > > >", scope: !16, file: !14, line: 387, size: 192, flags: DIFlagTypePassByReference | DIFlagNonTrivial, elements: !3, templateParams: !3, identifier: "_ZTSNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEEE")
+ !16 = !DINamespace(name: "__1", scope: !17, exportSymbols: true)
+ !17 = !DINamespace(name: "std", scope: null)
+ !18 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "__wrap_iter<std::__1::unique_ptr<llvm::ErrorInfoBase,\0A\0A\0A\0Astd::__1::default_delete<llvm::ErrorInfoBase> > *>", scope: !16, file: !19, line: 41, baseType: !20, size: 64)
+ !19 = !DIFile(filename: "/Library/Developer/CommandLineTools/SDKs/MacOSX15.3.sdk/usr/include/c++/v1/__iterator/wrap_iter.h", directory: "")
+ !20 = !DIDerivedType(tag: DW_TAG_typedef, name: "iterator_type", scope: !18, file: !19, line: 30, baseType: !21, flags: DIFlagPublic)
+ !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !22, size: 64)
+ !22 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "unique_ptr<llvm::ErrorInfoBase,\0A\0A\0A\0Astd::__1::default_delete<llvm::ErrorInfoBase> >", scope: !16, file: !23, line: 124, size: 64, flags: DIFlagTypePassByReference | DIFlagNonTrivial, elements: !3, templateParams: !3, identifier: "_ZTSNSt3__110unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS2_EEEE")
+ !23 = !DIFile(filename: "/Library/Developer/CommandLineTools/SDKs/MacOSX15.3.sdk/usr/include/c++/v1/__memory/unique_ptr.h", directory: "")
+ !24 = !DILocation(line: 963, column: 18, scope: !10)
+ !25 = !DILocation(line: 0, scope: !10)
+
+...
+---
+name: _ZNSt3__1neB8nn180100IPNS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEEEEbRKNS_11__wrap_iterIT_EESC_
+alignment: 4
+exposesReturnsTwice: false
+legalized: false
+regBankSelected: false
+selected: false
+failedISel: false
+tracksRegLiveness: true
+hasWinCFI: false
+noPhis: true
+isSSA: false
+noVRegs: true
+hasFakeUses: false
+callsEHReturn: false
+callsUnwindInit: false
+hasEHCatchret: false
+hasEHScopes: false
+hasEHFunclets: false
+isOutlined: false
+debugInstrRef: true
+failsVerification: false
+tracksDebugUserValues: true
+registers: []
+liveins:
+ - { reg: '$x0', virtual-reg: '' }
+ - { reg: '$x1', virtual-reg: '' }
+frameInfo:
+ isFrameAddressTaken: false
+ isReturnAddressTaken: false
+ hasStackMap: false
+ hasPatchPoint: false
+ stackSize: 0
+ offsetAdjustment: 0
+ maxAlignment: 1
+ adjustsStack: false
+ hasCalls: false
+ stackProtector: ''
+ functionContext: ''
+ maxCallFrameSize: 0
+ cvBytesOfCalleeSavedRegisters: 0
+ hasOpaqueSPAdjustment: false
+ hasVAStart: false
+ hasMustTailInVarArgFunc: false
+ hasTailCall: false
+ isCalleeSavedInfoValid: true
+ localFrameSize: 0
+ savePoint: ''
+ restorePoint: ''
+fixedStack: []
+stack: []
+entry_values: []
+callSites: []
+debugValueSubstitutions: []
+constants: []
+machineFunctionInfo:
+ hasRedZone: false
+body: |
+ bb.0 (%ir-block.0):
+ liveins: $x0, $x1
+
+ renamable $x8 = LDRXui killed renamable $x1, 0 :: (load (s64) from %ir.__y)
+ dead $xzr = SUBSXrr killed renamable $x0, killed renamable $x8, implicit-def $nzcv
+ renamable $w0 = CSINCWr $wzr, $wzr, 1, implicit killed $nzcv
+ RET_ReallyLR implicit $w0
+
+...
+---
+name: _ZNKSt3__111__wrap_iterIPNS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEEE4baseB8nn180100Ev
+alignment: 4
+exposesReturnsTwice: false
+legalized: false
+regBankSelected: false
+selected: false
+failedISel: false
+tracksRegLiveness: true
+hasWinCFI: false
+noPhis: true
+isSSA: false
+noVRegs: true
+hasFakeUses: false
+callsEHReturn: false
+callsUnwindInit: false
+hasEHCatchret: false
+hasEHScopes: false
+hasEHFunclets: false
+isOutlined: false
+debugInstrRef: true
+failsVerification: false
+tracksDebugUserValues: true
+registers: []
+liveins:
+ - { reg: '$x0', virtual-reg: '' }
+frameInfo:
+ isFrameAddressTaken: false
+ isReturnAddressTaken: false
+ hasStackMap: false
+ hasPatchPoint: false
+ stackSize: 0
+ offsetAdjustment: 0
+ maxAlignment: 1
+ adjustsStack: false
+ hasCalls: false
+ stackProtector: ''
+ functionContext: ''
+ maxCallFrameSize: 0
+ cvBytesOfCalleeSavedRegisters: 0
+ hasOpaqueSPAdjustment: false
+ hasVAStart: false
+ hasMustTailInVarArgFunc: false
+ hasTailCall: false
+ isCalleeSavedInfoValid: true
+ localFrameSize: 0
+ savePoint: ''
+ restorePoint: ''
+fixedStack: []
+stack: []
+entry_values: []
+callSites: []
+debugValueSubstitutions: []
+constants: []
+machineFunctionInfo:
+ hasRedZone: false
+body: |
+ bb.0.entry:
+ liveins: $x0
+
+ renamable $x0 = LDRXui killed renamable $x0, 0 :: (load (s64) from %ir.this)
+ RET_ReallyLR implicit $x0
+
+...
+---
+name: _ZN4llvm12handleErrorsIJZNS_12consumeErrorENS_5ErrorEEUlRKNS_13ErrorInfoBaseEE_EEES1_S1_DpOT_
+alignment: 4
+exposesReturnsTwice: false
+legalized: false
+regBankSelected: false
+selected: false
+failedISel: false
+tracksRegLiveness: true
+hasWinCFI: false
+noPhis: true
+isSSA: false
+noVRegs: true
+hasFakeUses: false
+callsEHReturn: false
+callsUnwindInit: false
+hasEHCatchret: false
+hasEHScopes: false
+hasEHFunclets: false
+isOutlined: false
+debugInstrRef: true
+failsVerification: false
+tracksDebugUserValues: true
+registers: []
+liveins:
+ - { reg: '$x0', virtual-reg: '' }
+frameInfo:
+ isFrameAddressTaken: false
+ isReturnAddressTaken: false
+ hasStackMap: false
+ hasPatchPoint: false
+ stackSize: 0
+ offsetAdjustment: 0
+ maxAlignment: 1
+ adjustsStack: false
+ hasCalls: false
+ stackProtector: ''
+ functionContext: ''
+ maxCallFrameSize: 0
+ cvBytesOfCalleeSavedRegisters: 0
+ hasOpaqueSPAdjustment: false
+ hasVAStart: false
+ hasMustTailInVarArgFunc: false
+ hasTailCall: false
+ isCalleeSavedInfoValid: true
+ localFrameSize: 0
+ savePoint: ''
+ restorePoint: ''
+fixedStack: []
+stack: []
+entry_values: []
+callSites: []
+debugValueSubstitutions: []
+constants: []
+machineFunctionInfo:
+ hasRedZone: false
+body: |
+ bb.0 (%ir-block.0):
+ liveins: $x0
+
+ $x8 = MOVZXi 0, 0
+ dead $xzr = LDRXui killed renamable $x8, 0, debug-location !24 :: (volatile load (s64) from `ptr null`, align 4294967296)
+ renamable $x8 = LOADgot target-flags(aarch64-got) @_ZNSt3__16vectorINS_10unique_ptrIN4llvm13ErrorInfoBaseENS_14default_deleteIS3_EEEENS_9allocatorIS6_EEE3endB8nn180100Ev, debug-instr-number 1
+ DBG_INSTR_REF !9, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !25
+ dead $xzr = SUBSXrr killed renamable $x0, killed renamable $x8, implicit-def $nzcv
+ RET_ReallyLR
+
+...
``````````
</details>
https://github.com/llvm/llvm-project/pull/128081
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