From b58346f2f266ce9164e74ee2a01c0f676431f7cc Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Thu, 8 Dec 2016 22:44:13 +0000
Subject: [PATCH] GlobalISel: fall back gracefully for debug intrinsics.

Supporting them properly is a reasonably complex chunk of work, so to allow bot
testing before then we should at least be able to fall back to DAG ISel.

llvm-svn: 289150
---
 llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp       |  6 ++++
 .../CodeGen/AArch64/GlobalISel/arm64-fallback.ll   | 33 ++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 92607dc..936e1b8 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -466,6 +466,12 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
   switch (ID) {
   default:
     break;
+  case Intrinsic::dbg_declare:
+  case Intrinsic::dbg_value:
+    // FIXME: these obviously need to be supported properly.
+    MF->getProperties().set(
+          MachineFunctionProperties::Property::FailedISel);
+    return true;
   case Intrinsic::uadd_with_overflow:
     return translateOverflowIntrinsic(CI, TargetOpcode::G_UADDE, MIRBuilder);
   case Intrinsic::sadd_with_overflow:
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll b/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
index e4a2bb2..8d1dbc2 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
@@ -82,3 +82,36 @@ define void @legal_default(i64 %in) {
   insertvalue [2 x i64] undef, i64 %in, 0
   ret void
 }
+
+; FALLBACK-WITH-REPORT-ERR: warning: Instruction selection used fallback path for debug_insts
+; FALLBACK-WITH-REPORT-LABEL: debug_insts:
+define void @debug_insts(i32 %in) #0 !dbg !7 {
+entry:
+  %in.addr = alloca i32, align 4
+  store i32 %in, i32* %in.addr, align 4
+  call void @llvm.dbg.declare(metadata i32* %in.addr, metadata !11, metadata !12), !dbg !13
+  ret void, !dbg !14
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(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 4.0.0 (trunk 289075) (llvm/trunk 289080)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "tmp.c", directory: "/Users/tim/llvm/build")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"PIC Level", i32 2}
+!6 = !{!"clang version 4.0.0 (trunk 289075) (llvm/trunk 289080)"}
+!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null, !10}
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !DILocalVariable(name: "in", arg: 1, scope: !7, file: !1, line: 1, type: !10)
+!12 = !DIExpression()
+!13 = !DILocation(line: 1, column: 14, scope: !7)
+!14 = !DILocation(line: 2, column: 1, scope: !7)
-- 
2.7.4