From 0507fc2ffc96819429e8074408d33609081c7205 Mon Sep 17 00:00:00 2001 From: Jeremy Morse Date: Thu, 3 Jun 2021 17:16:58 +0100 Subject: [PATCH] Revert "[DebugInstrRef][2/3] Track PHI values through register coalescing" This reverts commit ae4303b42cfa5c8c14e3fff67d73af2f154aea9a. Expensive checks buildbot has found a problem with this: https://lab.llvm.org/buildbot/#/builders/16/builds/11863 --- llvm/lib/CodeGen/RegisterCoalescer.cpp | 97 ------------ .../DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir | 165 --------------------- .../test/DebugInfo/MIR/InstrRef/phi-coalescing.mir | 165 --------------------- 3 files changed, 427 deletions(-) delete mode 100644 llvm/test/DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir delete mode 100644 llvm/test/DebugInfo/MIR/InstrRef/phi-coalescing.mir diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp index dd5e490..f535688 100644 --- a/llvm/lib/CodeGen/RegisterCoalescer.cpp +++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp @@ -133,20 +133,6 @@ namespace { AliasAnalysis *AA = nullptr; RegisterClassInfo RegClassInfo; - /// Position and VReg of a PHI instruction during coalescing. - struct PHIValPos { - SlotIndex SI; ///< Slot where this PHI occurs. - Register Reg; ///< VReg the PHI occurs in. - unsigned SubReg; ///< Qualifying subregister for Reg. - }; - - /// Map from debug instruction number to PHI position during coalescing. - DenseMap PHIValToPos; - /// Index of, for each VReg, which debug instruction numbers and - /// corresponding PHIs are sensitive to coalescing. Each VReg may have - /// multiple PHI defs, at different positions. - DenseMap> RegToPHIIdx; - /// Debug variable location tracking -- for each VReg, maintain an /// ordered-by-slot-index set of DBG_VALUEs, to help quick /// identification of whether coalescing may change location validity. @@ -3560,64 +3546,6 @@ bool RegisterCoalescer::joinVirtRegs(CoalescerPair &CP) { // Scan and mark undef any DBG_VALUEs that would refer to a different value. checkMergingChangesDbgValues(CP, LHS, LHSVals, RHS, RHSVals); - // If the RHS covers any PHI locations that were tracked for debug-info, we - // must update tracking information to reflect the join. - auto RegIt = RegToPHIIdx.find(CP.getSrcReg()); - if (RegIt != RegToPHIIdx.end()) { - // Iterate over all the debug instruction numbers assigned this register. - for (unsigned InstID : RegIt->second) { - auto PHIIt = PHIValToPos.find(InstID); - assert(PHIIt != PHIValToPos.end()); - const SlotIndex &SI = PHIIt->second.SI; - - // Does the RHS cover the position of this PHI? - auto LII = RHS.find(SI); - if (LII == RHS.end() || LII->start > SI) - continue; - - // Accept two kinds of subregister movement: - // * When we merge from one register class into a larger register: - // %1:gr16 = some-inst - // -> - // %2:gr32.sub_16bit = some-inst - // * When the PHI is already in a subregister, and the larger class - // is coalesced: - // %2:gr32.sub_16bit = some-inst - // %3:gr32 = COPY %2 - // -> - // %3:gr32.sub_16bit = some-inst - // Test for subregister move: - if (CP.getSrcIdx() != 0 || CP.getDstIdx() != 0) - // If we're moving between different subregisters, ignore this join. - // The PHI will not get a location, dropping variable locations. - if (PHIIt->second.SubReg && PHIIt->second.SubReg != CP.getSrcIdx()) - continue; - - // Update our tracking of where the PHI is. - PHIIt->second.Reg = CP.getDstReg(); - - // If we merge into a sub-register of a larger class (test above), - // update SubReg. - if (CP.getSrcIdx() != 0) - PHIIt->second.SubReg = CP.getSrcIdx(); - } - - // Rebuild the register index in RegToPHIIdx to account for PHIs tracking - // different VRegs now. Copy old collection of debug instruction numbers and - // erase the old one: - auto InstrNums = RegIt->second; - RegToPHIIdx.erase(RegIt); - - // There might already be PHIs being tracked in the destination VReg. Insert - // into an existing tracking collection, or insert a new one. - RegIt = RegToPHIIdx.find(CP.getDstReg()); - if (RegIt != RegToPHIIdx.end()) - RegIt->second.insert(RegIt->second.end(), InstrNums.begin(), - InstrNums.end()); - else - RegToPHIIdx.insert({CP.getDstReg(), InstrNums}); - } - // Join RHS into LHS. LHS.join(RHS, LHSVals.getAssignments(), RHSVals.getAssignments(), NewVNInfo); @@ -4079,19 +4007,6 @@ bool RegisterCoalescer::runOnMachineFunction(MachineFunction &fn) { else JoinGlobalCopies = (EnableGlobalCopies == cl::BOU_TRUE); - // If there are PHIs tracked by debug-info, they will need updating during - // coalescing. Build an index of those PHIs to ease updating. - SlotIndexes *Slots = LIS->getSlotIndexes(); - for (const auto &DebugPHI : MF->DebugPHIPositions) { - MachineBasicBlock *MBB = DebugPHI.second.MBB; - Register Reg = DebugPHI.second.Reg; - unsigned SubReg = DebugPHI.second.SubReg; - SlotIndex SI = Slots->getMBBStartIdx(MBB); - PHIValPos P = {SI, Reg, SubReg}; - PHIValToPos.insert(std::make_pair(DebugPHI.first, P)); - RegToPHIIdx[Reg].push_back(DebugPHI.first); - } - // The MachineScheduler does not currently require JoinSplitEdges. This will // either be enabled unconditionally or replaced by a more general live range // splitting optimization. @@ -4147,18 +4062,6 @@ bool RegisterCoalescer::runOnMachineFunction(MachineFunction &fn) { } } - // After coalescing, update any PHIs that are being tracked by debug-info - // with their new VReg locations. - for (auto &p : MF->DebugPHIPositions) { - auto it = PHIValToPos.find(p.first); - assert(it != PHIValToPos.end()); - p.second.Reg = it->second.Reg; - p.second.SubReg = it->second.SubReg; - } - - PHIValToPos.clear(); - RegToPHIIdx.clear(); - LLVM_DEBUG(dump()); if (VerifyCoalescing) MF->verify(this, "After register coalescing"); diff --git a/llvm/test/DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir b/llvm/test/DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir deleted file mode 100644 index b337fd6..0000000 --- a/llvm/test/DebugInfo/MIR/InstrRef/phi-coalesce-subreg.mir +++ /dev/null @@ -1,165 +0,0 @@ -# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ -# RUN: -experimental-debug-variable-locations \ -# RUN: -run-pass=phi-node-elimination,simple-register-coalescing \ -# RUN: | FileCheck %s --check-prefix=DOESCOALESCE -# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ -# RUN: -experimental-debug-variable-locations \ -# RUN: -run-pass=phi-node-elimination,simple-register-coalescing,livedebugvars,greedy,virtregrewriter \ -# RUN: | FileCheck %s --check-prefix=CHECK -# -# This is a sibling-test for phi-coalescing.mir, using similar code but where -# registers are coalesced across subregisters. Specifically, vreg %2 below is -# a 16-bit register, but will be coalesced into the lower 16 bits of a 32 bit -# vreg during coalescing. We should survive this transformation, and emit a -# DBG_PHI for $bx where the PHI was. ---- | - ; ModuleID = 'promoted.ll' - source_filename = "test.c" - target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" - target triple = "x86_64-unknown-linux-gnu" - - ; Function Attrs: noinline nounwind uwtable - define dso_local i32 @foo(i16 signext %bar, i16 signext %baz) !dbg !7 { - entry: - call void @llvm.dbg.value(metadata i16 %bar, metadata !12, metadata !DIExpression()), !dbg !13 - call void @llvm.dbg.value(metadata i16 %baz, metadata !14, metadata !DIExpression()), !dbg !13 - call void @ext(i16 signext %bar), !dbg !13 - %conv = sext i16 %bar to i32, !dbg !13 - %add = add nsw i32 %conv, 12, !dbg !13 - %conv1 = trunc i32 %add to i16, !dbg !13 - call void @llvm.dbg.value(metadata i16 %conv1, metadata !12, metadata !DIExpression()), !dbg !13 - call void @ext(i16 signext %conv1), !dbg !13 - %call = call signext i16 @getlong(), !dbg !13 - %tobool = icmp ne i16 %call, 0, !dbg !13 - br i1 %tobool, label %if.then, label %if.end, !dbg !13 - - if.then: ; preds = %entry - %conv2 = sext i16 %conv1 to i32, !dbg !13 - %add3 = add nsw i32 %conv2, 1, !dbg !13 - %conv4 = trunc i32 %add3 to i16, !dbg !13 - call void @llvm.dbg.value(metadata i16 %conv4, metadata !12, metadata !DIExpression()), !dbg !13 - br label %if.end, !dbg !13 - - if.end: ; preds = %if.then, %entry - %bar.addr.0 = phi i16 [ %conv4, %if.then ], [ %conv1, %entry ], !dbg !13 - call void @llvm.dbg.value(metadata i16 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 - %conv5 = sext i16 %baz to i32, !dbg !13 - %conv6 = sext i16 %bar.addr.0 to i32, !dbg !13 - %add7 = add nsw i32 %conv6, %conv5, !dbg !13 - %conv8 = trunc i32 %add7 to i16, !dbg !13 - call void @llvm.dbg.value(metadata i16 %conv8, metadata !12, metadata !DIExpression()), !dbg !13 - call void @ext(i16 signext %conv8), !dbg !13 - %conv9 = sext i16 %conv8 to i32, !dbg !13 - ret i32 %conv9, !dbg !13 - } - - ; Function Attrs: nounwind readnone speculatable willreturn - declare void @llvm.dbg.declare(metadata, metadata, metadata) - - declare dso_local void @ext(i16 signext) - - declare dso_local signext i16 @getlong() - - ; Function Attrs: nounwind readnone speculatable willreturn - declare void @llvm.dbg.value(metadata, metadata, metadata) - - !llvm.dbg.cu = !{!0} - !llvm.module.flags = !{!3, !4, !5} - !llvm.ident = !{!6} - - !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) - !1 = !DIFile(filename: "test.c", directory: "/fast/fs/llvm3/llvm/test/DebugInfo/MIR/InstrRef") - !2 = !{} - !3 = !{i32 7, !"Dwarf Version", i32 4} - !4 = !{i32 2, !"Debug Info Version", i32 3} - !5 = !{i32 1, !"wchar_size", i32 4} - !6 = !{!"clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)"} - !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) - !8 = !DISubroutineType(types: !9) - !9 = !{!10, !11, !11} - !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) - !11 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed) - !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) - !13 = !DILocation(line: 0, scope: !7) - !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) - !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7) - -... ---- -name: foo -alignment: 16 -tracksRegLiveness: true -liveins: - - { reg: '$edi', virtual-reg: '%3' } - - { reg: '$esi', virtual-reg: '%4' } -frameInfo: - maxAlignment: 1 - hasCalls: true -machineFunctionInfo: {} -body: | - bb.0.entry: - liveins: $edi, $esi - - %4:gr32 = COPY $esi - %3:gr32 = COPY $edi - %6:gr16 = COPY %4.sub_16bit - %5:gr16 = COPY %3.sub_16bit - DBG_VALUE %5, $noreg, !12, !DIExpression(), debug-location !13 - DBG_VALUE %6, $noreg, !14, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %15:gr32 = MOVSX32rr16 %5, debug-location !13 - $edi = COPY %15, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %14:gr32 = MOVSX32rr16 %5, debug-location !13 - %13:gr32 = ADD32ri8 killed %14, 12, implicit-def $eflags, debug-location !13 - %11:gr16 = COPY killed %13.sub_16bit, debug-location !13 - DBG_VALUE %11, $noreg, !12, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %9:gr32 = MOVSX32rr16 %11, debug-location !13 - $edi = COPY %9, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $ax, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %8:gr16 = COPY $ax, debug-location !13 - CMP16ri8 %8, 0, implicit-def $eflags, debug-location !13 - JCC_1 %bb.2, 4, implicit $eflags, debug-location !13 - - ; DOESCOALESCE-LABEL: bb.1.if.then: - ; CHECK-LABEL: bb.1.if.then: - bb.1.if.then: - %20:gr32 = MOVSX32rr16 %11, debug-location !13 - %19:gr32 = ADD32ri8 killed %20, 1, implicit-def $eflags, debug-location !13 - %17:gr16 = COPY killed %19.sub_16bit, debug-location !13 - DBG_VALUE %17, $noreg, !12, !DIExpression(), debug-location !13 - - ; Verify that vreg 17 is coalesced into gr32. - ; DOESCOALESCE: %{{[0-9]+}}:gr32 = ADD32ri8 - ; DOESCOALESCE-NEXT: DBG_VALUE %{{[0-9]+}}.sub_16bit, - ; Verify those registers land in $bx - ; CHECK: renamable $ebp = ADD32ri8 - ; CHECK-NEXT: DBG_VALUE $bp - - ; DOESCOALESCE-LABEL: bb.2.if.end: - ; CHECK-LABEL: bb.2.if.end: - bb.2.if.end: - %2:gr16 = PHI %11, %bb.0, %17, %bb.1, debug-instr-number 1, debug-location !13 - ; CHECK: DBG_PHI $bp, 1 - DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13 - %31:gr32 = MOVSX32rr16 %6, debug-location !13 - %30:gr32 = MOVSX32rr16 killed %2, debug-location !13 - %29:gr32 = ADD32rr killed %30, killed %31, implicit-def $eflags, debug-location !13 - %26:gr16 = COPY killed %29.sub_16bit, debug-location !13 - DBG_VALUE %26, $noreg, !12, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %24:gr32 = MOVSX32rr16 %26, debug-location !13 - $edi = COPY %24, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %23:gr32 = MOVSX32rr16 %26, debug-location !13 - $eax = COPY %23, debug-location !13 - RETQ implicit $eax, debug-location !13 - -... diff --git a/llvm/test/DebugInfo/MIR/InstrRef/phi-coalescing.mir b/llvm/test/DebugInfo/MIR/InstrRef/phi-coalescing.mir deleted file mode 100644 index ae4b68b..0000000 --- a/llvm/test/DebugInfo/MIR/InstrRef/phi-coalescing.mir +++ /dev/null @@ -1,165 +0,0 @@ -# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ -# RUN: -experimental-debug-variable-locations \ -# RUN: -run-pass=phi-node-elimination,simple-register-coalescing \ -# RUN: | FileCheck %s --check-prefix=DOESCOALESCE -# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ -# RUN: -experimental-debug-variable-locations \ -# RUN: -run-pass=phi-node-elimination,simple-register-coalescing,livedebugvars,greedy,virtregrewriter \ -# RUN: | FileCheck %s --check-prefix=CHECK -# -# Test that a PHI with a debug instruction number attached survives register -# coalescing, when its vreg gets coalesced. This test comes in two parts, first -# that coalescing actually happens, second that a DBG_PHI is still produced -# afterwards. -# -# Original C code, the PHI is of the value of 'bar' after the control flow. -# Compiled at -O0, applied -mem2reg, llc -O0, then manually added the PHI -# instruction label. -# -# void ext(long); -# long getlong(void); -# int foo(long bar, long baz) { -# ext(bar); -# bar += 12; -# ext(bar); -# -# if (getlong()) -# bar += 1; -# -# bar += baz; -# ext(bar); -# return bar; -# } -# ---- | - ; ModuleID = 'promoted.ll' - source_filename = "test.c" - target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" - target triple = "x86_64-unknown-linux-gnu" - - define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 { - entry: - call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13 - call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13 - call void @ext(i64 %bar), !dbg !13 - %add = add nsw i64 %bar, 12, !dbg !13 - call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13 - call void @ext(i64 %add), !dbg !13 - %call = call i64 @getlong(), !dbg !13 - %tobool = icmp ne i64 %call, 0, !dbg !13 - br i1 %tobool, label %if.then, label %if.end, !dbg !13 - - if.then: ; preds = %entry - %add1 = add nsw i64 %add, 1, !dbg !13 - call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13 - br label %if.end, !dbg !13 - - if.end: ; preds = %if.then, %entry - %bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13 - call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 - %add2 = add nsw i64 %bar.addr.0, %baz, !dbg !13 - call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13 - call void @ext(i64 %add2), !dbg !13 - %conv = trunc i64 %add2 to i32, !dbg !13 - ret i32 %conv, !dbg !13 - } - - ; Function Attrs: nounwind readnone speculatable willreturn - declare void @llvm.dbg.declare(metadata, metadata, metadata) - - declare dso_local void @ext(i64) - - declare dso_local i64 @getlong() - - ; Function Attrs: nounwind readnone speculatable willreturn - declare void @llvm.dbg.value(metadata, metadata, metadata) - - !llvm.dbg.cu = !{!0} - !llvm.module.flags = !{!3, !4, !5} - !llvm.ident = !{!6} - - !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) - !1 = !DIFile(filename: "test.c", directory: "/tmp/out.c") - !2 = !{} - !3 = !{i32 7, !"Dwarf Version", i32 4} - !4 = !{i32 2, !"Debug Info Version", i32 3} - !5 = !{i32 1, !"wchar_size", i32 4} - !6 = !{!""} - !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) - !8 = !DISubroutineType(types: !9) - !9 = !{!10, !11, !11} - !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) - !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) - !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) - !13 = !DILocation(line: 0, scope: !7) - !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) - !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7) - -... ---- -name: foo -alignment: 16 -tracksRegLiveness: true -liveins: - - { reg: '$rdi', virtual-reg: '%3' } - - { reg: '$rsi', virtual-reg: '%5' } -frameInfo: - maxAlignment: 1 - hasCalls: true -machineFunctionInfo: {} -body: | - bb.0.entry: - liveins: $rdi, $rsi - - %5:gr64 = COPY $rsi - %3:gr64 = COPY $rdi - %4:gr64 = COPY killed %3 - %6:gr64 = COPY killed %5 - DBG_VALUE %4, $noreg, !12, !DIExpression(), debug-location !13 - DBG_VALUE %6, $noreg, !14, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - $rdi = COPY %4, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %9:gr64 = ADD64ri32 %4, 12, implicit-def $eflags, debug-location !13 - DBG_VALUE %9, $noreg, !12, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - $rdi = COPY %9, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %8:gr64 = COPY $rax, debug-location !13 - CMP64ri8 %8, 0, implicit-def $eflags, debug-location !13 - JCC_1 %bb.2, 4, implicit $eflags, debug-location !13 - - ; DOESCOALESCE-LABEL: bb.1.if.then: - ; CHECK-LABEL: bb.1.if.then: - bb.1.if.then: - %10:gr64 = ADD64ri32 %9, 1, implicit-def $eflags, debug-location !13 - DBG_VALUE %10, $noreg, !12, !DIExpression(), debug-location !13 - - ; Verify that the vreg is different immediately after register coalescing. - ; DOESCOALESCE-NOT: %10:gr64 ADD64ri32 - ; DOESCOALESCE: %{{[0-9]+}}:gr64 = ADD64ri32 - ; Verify that all these registers land in rbx. - ; CHECK: renamable $rbx = ADD64ri32 killed renamable $rbx - - ; DOESCOALESCE-LABEL: bb.2.if.end: - ; CHECK-LABEL: bb.2.if.end: - bb.2.if.end: - %2:gr64 = PHI %9, %bb.0, %10, %bb.1, debug-instr-number 1, debug-location !13 - ; CHECK: DBG_PHI $rbx, 1 - DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13 - %14:gr64 = ADD64rr killed %2, %6, implicit-def $eflags, debug-location !13 - DBG_VALUE %14, $noreg, !12, !DIExpression(), debug-location !13 - ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - $rdi = COPY %14, debug-location !13 - CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 - ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 - %13:gr32 = COPY %14.sub_32bit, debug-location !13 - $eax = COPY %13, debug-location !13 - RETQ implicit $eax, debug-location !13 - -... -- 2.7.4