diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2474,6 +2474,10 @@
     DwarfExpr.addExpression(std::move(ExprCursor));
     return;
   }
+  if (Value.isConstantInt()) {
+    DwarfExpr.addUnsignedConstant(Value.getConstantInt()->getValue(), AP);
+    return;
+  }
   if (Value.isConstantFP()) {
     DwarfExpr.addConstantFP(Value.getConstantFP()->getValueAPF(), AP);
     return;
diff --git a/llvm/test/DebugInfo/X86/implicit_value-int128_t.ll b/llvm/test/DebugInfo/X86/implicit_value-int128_t.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/implicit_value-int128_t.ll
@@ -0,0 +1,46 @@
+; RUN: llc -debugger-tune=gdb -filetype=obj %s -o - | llvm-dwarfdump - \
+; RUN:   | FileCheck %s --check-prefixes=GDB,BOTH
+; RUN: llc -debugger-tune=sce -filetype=obj %s -o - | llvm-dwarfdump - \
+; RUN:   | FileCheck %s --check-prefixes=SCE,BOTH
+
+; BOTH: DW_TAG_variable
+; BOTH-NEXT:  DW_AT_location
+; GDB-NEXT:      {{.*}}: DW_OP_implicit_value 0x10 0x0f 0x0e 0x0d 0x0c 0x0b 0x0a 0x09 0x08 0x07 0x06 0x05 0x04 0x03 0x02 0x01 0x00
+; SCE-NEXT:      {{.*}}: DW_OP_constu 0x8090a0b0c0d0e0f, DW_OP_stack_value, DW_OP_piece 0x8, DW_OP_constu 0x1020304050607, DW_OP_stack_value, DW_OP_bit_piece 0x40 0x40
+; GDB-NEXT:      {{.*}}: DW_OP_implicit_value 0x10 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0)
+; SCE-NEXT:      {{.*}}: DW_OP_constu 0x7060504030201000, DW_OP_stack_value, DW_OP_piece 0x8, DW_OP_constu 0xf0e0d0c0b0a09080, DW_OP_stack_value, DW_OP_bit_piece 0x40 0x40
+; BOTH-NEXT:  DW_AT_name    ("a")
+
+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 void @f() local_unnamed_addr !dbg !7 {
+entry:
+  call void @llvm.dbg.value(metadata i128 5233100606242806050955395731361295, metadata !12, metadata !DIExpression()), !dbg !15
+  tail call void @g(), !dbg !15
+  call void @llvm.dbg.value(metadata i128 320182027492359845421654932427609477120, metadata !12, metadata !DIExpression()), !dbg !15
+  tail call void @g(), !dbg !15
+  ret void, !dbg !15
+}
+
+declare dso_local void @g() local_unnamed_addr
+
+declare void @llvm.dbg.value(metadata, metadata, metadata) #2
+
+attributes #2 = { nofree nosync nounwind readnone speculatable willreturn }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "-", directory: "/")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, type: !9, unit: !0)
+!9 = !DISubroutineType(types: !10)
+!10 = !{null}
+!12 = !DILocalVariable(name: "a", scope: !7, file: !1, type: !14)
+!14 = !DIBasicType(name: "__int128", size: 128, encoding: DW_ATE_signed)
+!15 = !DILocation(line: 0, scope: !7)