diff --git a/clang/include/clang/Basic/Cuda.h b/clang/include/clang/Basic/Cuda.h
--- a/clang/include/clang/Basic/Cuda.h
+++ b/clang/include/clang/Basic/Cuda.h
@@ -75,6 +75,7 @@
   GFX906,
   GFX908,
   GFX909,
+  GFX90c,
   GFX1010,
   GFX1011,
   GFX1012,
diff --git a/clang/lib/Basic/Cuda.cpp b/clang/lib/Basic/Cuda.cpp
--- a/clang/lib/Basic/Cuda.cpp
+++ b/clang/lib/Basic/Cuda.cpp
@@ -87,7 +87,7 @@
     GFX(805), // tongapro
     GFX(810), // stoney
     GFX(900), // vega, instinct
-    GFX(902), GFX(904), GFX(906), GFX(908), GFX(909),
+    GFX(902), GFX(904), GFX(906), GFX(908), GFX(909), GFX(90c),
     GFX(1010), GFX(1011), GFX(1012), GFX(1030), GFX(1031)
     // clang-format on
 };
diff --git a/clang/lib/Basic/Targets/AMDGPU.cpp b/clang/lib/Basic/Targets/AMDGPU.cpp
--- a/clang/lib/Basic/Targets/AMDGPU.cpp
+++ b/clang/lib/Basic/Targets/AMDGPU.cpp
@@ -222,6 +222,7 @@
       Features["dot1-insts"] = true;
       Features["dot2-insts"] = true;
       LLVM_FALLTHROUGH;
+    case GK_GFX90C:
     case GK_GFX909:
     case GK_GFX904:
     case GK_GFX902:
diff --git a/clang/lib/Basic/Targets/NVPTX.cpp b/clang/lib/Basic/Targets/NVPTX.cpp
--- a/clang/lib/Basic/Targets/NVPTX.cpp
+++ b/clang/lib/Basic/Targets/NVPTX.cpp
@@ -200,6 +200,7 @@
       case CudaArch::GFX906:
       case CudaArch::GFX908:
       case CudaArch::GFX909:
+      case CudaArch::GFX90c:
       case CudaArch::GFX1010:
       case CudaArch::GFX1011:
       case CudaArch::GFX1012:
diff --git a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
--- a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
@@ -4640,6 +4640,7 @@
       case CudaArch::GFX906:
       case CudaArch::GFX908:
       case CudaArch::GFX909:
+      case CudaArch::GFX90c:
       case CudaArch::GFX1010:
       case CudaArch::GFX1011:
       case CudaArch::GFX1012:
@@ -4706,6 +4707,7 @@
   case CudaArch::GFX906:
   case CudaArch::GFX908:
   case CudaArch::GFX909:
+  case CudaArch::GFX90c:
   case CudaArch::GFX1010:
   case CudaArch::GFX1011:
   case CudaArch::GFX1012:
diff --git a/clang/test/CodeGenOpenCL/amdgpu-features.cl b/clang/test/CodeGenOpenCL/amdgpu-features.cl
--- a/clang/test/CodeGenOpenCL/amdgpu-features.cl
+++ b/clang/test/CodeGenOpenCL/amdgpu-features.cl
@@ -12,6 +12,7 @@
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx906 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX906 %s
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx908 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX908 %s
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx909 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX909 %s
+// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx90c -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX90C %s
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx1010 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX1010 %s
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx1011 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX1011 %s
 // RUN: %clang_cc1 -triple amdgcn -target-cpu gfx1012 -S -emit-llvm -o - %s | FileCheck --check-prefix=GFX1012 %s
@@ -39,6 +40,7 @@
 // GFX906: "target-features"="+16-bit-insts,+ci-insts,+dl-insts,+dot1-insts,+dot2-insts,+dpp,+flat-address-space,+gfx8-insts,+gfx9-insts,+s-memrealtime"
 // GFX908: "target-features"="+16-bit-insts,+ci-insts,+dl-insts,+dot1-insts,+dot2-insts,+dot3-insts,+dot4-insts,+dot5-insts,+dot6-insts,+dpp,+flat-address-space,+gfx8-insts,+gfx9-insts,+mai-insts,+s-memrealtime"
 // GFX909: "target-features"="+16-bit-insts,+ci-insts,+dpp,+flat-address-space,+gfx8-insts,+gfx9-insts,+s-memrealtime"
+// GFX90C: "target-features"="+16-bit-insts,+ci-insts,+dpp,+flat-address-space,+gfx8-insts,+gfx9-insts,+s-memrealtime"
 // GFX1010: "target-features"="+16-bit-insts,+ci-insts,+dl-insts,+dpp,+flat-address-space,+gfx10-insts,+gfx8-insts,+gfx9-insts,+s-memrealtime"
 // GFX1011: "target-features"="+16-bit-insts,+ci-insts,+dl-insts,+dot1-insts,+dot2-insts,+dot5-insts,+dot6-insts,+dpp,+flat-address-space,+gfx10-insts,+gfx8-insts,+gfx9-insts,+s-memrealtime"
 // GFX1012: "target-features"="+16-bit-insts,+ci-insts,+dl-insts,+dot1-insts,+dot2-insts,+dot5-insts,+dot6-insts,+dpp,+flat-address-space,+gfx10-insts,+gfx8-insts,+gfx9-insts,+s-memrealtime"
diff --git a/clang/test/Driver/amdgpu-macros.cl b/clang/test/Driver/amdgpu-macros.cl
--- a/clang/test/Driver/amdgpu-macros.cl
+++ b/clang/test/Driver/amdgpu-macros.cl
@@ -181,6 +181,7 @@
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx906 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX906 %s
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx908 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX908 %s
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx909 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX909 %s
+// RUN: %clang -E -dM -target amdgcn -mcpu=gfx90c %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX90C %s
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx1010 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX1010 %s
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx1011 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX1011 %s
 // RUN: %clang -E -dM -target amdgcn -mcpu=gfx1012 %s 2>&1 | FileCheck --check-prefixes=ARCH-GCN,GFX1012 %s
@@ -208,6 +209,7 @@
 // GFX906-DAG: #define FP_FAST_FMA 1
 // GFX908-DAG: #define FP_FAST_FMA 1
 // GFX909-DAG: #define FP_FAST_FMA 1
+// GFX90C-DAG: #define FP_FAST_FMA 1
 // GFX1010-DAG: #define FP_FAST_FMA 1
 // GFX1011-DAG: #define FP_FAST_FMA 1
 // GFX1012-DAG: #define FP_FAST_FMA 1
@@ -235,6 +237,7 @@
 // GFX906-DAG: #define FP_FAST_FMAF 1
 // GFX908-DAG: #define FP_FAST_FMAF 1
 // GFX909-DAG: #define FP_FAST_FMAF 1
+// GFX90C-DAG: #define FP_FAST_FMAF 1
 // GFX1010-DAG: #define FP_FAST_FMAF 1
 // GFX1011-DAG: #define FP_FAST_FMAF 1
 // GFX1012-DAG: #define FP_FAST_FMAF 1
@@ -266,6 +269,7 @@
 // GFX906-DAG: #define __HAS_FMAF__ 1
 // GFX908-DAG: #define __HAS_FMAF__ 1
 // GFX909-DAG: #define __HAS_FMAF__ 1
+// GFX90C-DAG: #define __HAS_FMAF__ 1
 // GFX1010-DAG: #define __HAS_FMAF__ 1
 // GFX1011-DAG: #define __HAS_FMAF__ 1
 // GFX1012-DAG: #define __HAS_FMAF__ 1
@@ -293,6 +297,7 @@
 // GFX906-DAG: #define __HAS_FP64__ 1
 // GFX908-DAG: #define __HAS_FP64__ 1
 // GFX909-DAG: #define __HAS_FP64__ 1
+// GFX90C-DAG: #define __HAS_FP64__ 1
 // GFX1010-DAG: #define __HAS_FP64__ 1
 // GFX1011-DAG: #define __HAS_FP64__ 1
 // GFX1012-DAG: #define __HAS_FP64__ 1
@@ -320,6 +325,7 @@
 // GFX906-DAG: #define __HAS_LDEXPF__ 1
 // GFX908-DAG: #define __HAS_LDEXPF__ 1
 // GFX909-DAG: #define __HAS_LDEXPF__ 1
+// GFX90C-DAG: #define __HAS_LDEXPF__ 1
 // GFX1010-DAG: #define __HAS_LDEXPF__ 1
 // GFX1011-DAG: #define __HAS_LDEXPF__ 1
 // GFX1012-DAG: #define __HAS_LDEXPF__ 1
@@ -347,6 +353,7 @@
 // GFX906-DAG: #define __gfx906__ 1
 // GFX908-DAG: #define __gfx908__ 1
 // GFX909-DAG: #define __gfx909__ 1
+// GFX90C-DAG: #define __gfx90c__ 1
 // GFX1010-DAG: #define __gfx1010__ 1
 // GFX1011-DAG: #define __gfx1011__ 1
 // GFX1012-DAG: #define __gfx1012__ 1
@@ -374,6 +381,7 @@
 // GFX906-DAG: #define __amdgcn_processor__ "gfx906"
 // GFX908-DAG: #define __amdgcn_processor__ "gfx908"
 // GFX909-DAG: #define __amdgcn_processor__ "gfx909"
+// GFX90C-DAG: #define __amdgcn_processor__ "gfx90c"
 // GFX1010-DAG: #define __amdgcn_processor__ "gfx1010"
 // GFX1011-DAG: #define __amdgcn_processor__ "gfx1011"
 // GFX1012-DAG: #define __amdgcn_processor__ "gfx1012"
@@ -401,6 +409,7 @@
 // GFX906-DAG: #define __AMDGCN_WAVEFRONT_SIZE 64
 // GFX908-DAG: #define __AMDGCN_WAVEFRONT_SIZE 64
 // GFX909-DAG: #define __AMDGCN_WAVEFRONT_SIZE 64
+// GFX90C-DAG: #define __AMDGCN_WAVEFRONT_SIZE 64
 // GFX1010-DAG: #define __AMDGCN_WAVEFRONT_SIZE 32
 // GFX1011-DAG: #define __AMDGCN_WAVEFRONT_SIZE 32
 // GFX1012-DAG: #define __AMDGCN_WAVEFRONT_SIZE 32
diff --git a/clang/test/Driver/amdgpu-mcpu.cl b/clang/test/Driver/amdgpu-mcpu.cl
--- a/clang/test/Driver/amdgpu-mcpu.cl
+++ b/clang/test/Driver/amdgpu-mcpu.cl
@@ -90,6 +90,7 @@
 // RUN: %clang -### -target amdgcn -mcpu=gfx906 %s 2>&1 | FileCheck --check-prefix=GFX906 %s
 // RUN: %clang -### -target amdgcn -mcpu=gfx908 %s 2>&1 | FileCheck --check-prefix=GFX908 %s
 // RUN: %clang -### -target amdgcn -mcpu=gfx909 %s 2>&1 | FileCheck --check-prefix=GFX909 %s
+// RUN: %clang -### -target amdgcn -mcpu=gfx90c %s 2>&1 | FileCheck --check-prefix=GFX90C %s
 // RUN: %clang -### -target amdgcn -mcpu=gfx1010 %s 2>&1 | FileCheck --check-prefix=GFX1010 %s
 // RUN: %clang -### -target amdgcn -mcpu=gfx1011 %s 2>&1 | FileCheck --check-prefix=GFX1011 %s
 // RUN: %clang -### -target amdgcn -mcpu=gfx1012 %s 2>&1 | FileCheck --check-prefix=GFX1012 %s
@@ -118,6 +119,7 @@
 // GFX906:    "-target-cpu" "gfx906"
 // GFX908:    "-target-cpu" "gfx908"
 // GFX909:    "-target-cpu" "gfx909"
+// GFX90C:    "-target-cpu" "gfx90c"
 // GFX1010:   "-target-cpu" "gfx1010"
 // GFX1011:   "-target-cpu" "gfx1011"
 // GFX1012:   "-target-cpu" "gfx1012"
diff --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst
--- a/llvm/docs/AMDGPUUsage.rst
+++ b/llvm/docs/AMDGPUUsage.rst
@@ -257,6 +257,13 @@
                                                                                              Add product
                                                                                              names.
 
+     ``gfx90c``                  ``amdgcn``   APU   - xnack                               *TBA*
+                                                      [off]
+                                                                                          .. TODO::
+
+                                                                                             Add product
+                                                                                             names.
+
      **GCN GFX10** [AMD-GCN-GFX10]_
      -----------------------------------------------------------------------------------------------------------
      ``gfx1010``                 ``amdgcn``   dGPU  - xnack                               - Radeon RX 5700
@@ -848,7 +855,7 @@
      ``EF_AMDGPU_MACH_AMDGCN_GFX906``     0x02f      ``gfx906``
      ``EF_AMDGPU_MACH_AMDGCN_GFX908``     0x030      ``gfx908``
      ``EF_AMDGPU_MACH_AMDGCN_GFX909``     0x031      ``gfx909``
-     *reserved*                           0x032      Reserved.
+     ``EF_AMDGPU_MACH_AMDGCN_GFX90C``     0x032      ``gfx90c``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1010``    0x033      ``gfx1010``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1011``    0x034      ``gfx1011``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1012``    0x035      ``gfx1012``
diff --git a/llvm/include/llvm/BinaryFormat/ELF.h b/llvm/include/llvm/BinaryFormat/ELF.h
--- a/llvm/include/llvm/BinaryFormat/ELF.h
+++ b/llvm/include/llvm/BinaryFormat/ELF.h
@@ -713,7 +713,7 @@
   EF_AMDGPU_MACH_AMDGCN_GFX906        = 0x02f,
   EF_AMDGPU_MACH_AMDGCN_GFX908        = 0x030,
   EF_AMDGPU_MACH_AMDGCN_GFX909        = 0x031,
-  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X32 = 0x032,
+  EF_AMDGPU_MACH_AMDGCN_GFX90C        = 0x032,
   EF_AMDGPU_MACH_AMDGCN_GFX1010       = 0x033,
   EF_AMDGPU_MACH_AMDGCN_GFX1011       = 0x034,
   EF_AMDGPU_MACH_AMDGCN_GFX1012       = 0x035,
diff --git a/llvm/include/llvm/Support/TargetParser.h b/llvm/include/llvm/Support/TargetParser.h
--- a/llvm/include/llvm/Support/TargetParser.h
+++ b/llvm/include/llvm/Support/TargetParser.h
@@ -83,6 +83,7 @@
   GK_GFX906 = 63,
   GK_GFX908 = 64,
   GK_GFX909 = 65,
+  GK_GFX90C = 66,
 
   GK_GFX1010 = 71,
   GK_GFX1011 = 72,
diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -456,6 +456,8 @@
     return "gfx908";
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX909:
     return "gfx909";
+  case ELF::EF_AMDGPU_MACH_AMDGCN_GFX90C:
+    return "gfx90c";
 
   // AMDGCN GFX10.
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1010:
diff --git a/llvm/lib/ObjectYAML/ELFYAML.cpp b/llvm/lib/ObjectYAML/ELFYAML.cpp
--- a/llvm/lib/ObjectYAML/ELFYAML.cpp
+++ b/llvm/lib/ObjectYAML/ELFYAML.cpp
@@ -439,6 +439,7 @@
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX906, EF_AMDGPU_MACH);
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX908, EF_AMDGPU_MACH);
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX909, EF_AMDGPU_MACH);
+    BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX90C, EF_AMDGPU_MACH);
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX1010, EF_AMDGPU_MACH);
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX1011, EF_AMDGPU_MACH);
     BCaseMask(EF_AMDGPU_MACH_AMDGCN_GFX1012, EF_AMDGPU_MACH);
diff --git a/llvm/lib/Support/TargetParser.cpp b/llvm/lib/Support/TargetParser.cpp
--- a/llvm/lib/Support/TargetParser.cpp
+++ b/llvm/lib/Support/TargetParser.cpp
@@ -104,6 +104,7 @@
   {{"gfx906"},    {"gfx906"},  GK_GFX906,  FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_XNACK|FEATURE_SRAM_ECC},
   {{"gfx908"},    {"gfx908"},  GK_GFX908,  FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_XNACK|FEATURE_SRAM_ECC},
   {{"gfx909"},    {"gfx909"},  GK_GFX909,  FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_XNACK},
+  {{"gfx90c"},    {"gfx90c"},  GK_GFX90C,  FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_XNACK},
   {{"gfx1010"},   {"gfx1010"}, GK_GFX1010, FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_WAVE32|FEATURE_XNACK},
   {{"gfx1011"},   {"gfx1011"}, GK_GFX1011, FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_WAVE32|FEATURE_XNACK},
   {{"gfx1012"},   {"gfx1012"}, GK_GFX1012, FEATURE_FAST_FMA_F32|FEATURE_FAST_DENORMAL_F32|FEATURE_WAVE32|FEATURE_XNACK},
@@ -211,6 +212,7 @@
   case GK_GFX906:  return {9, 0, 6};
   case GK_GFX908:  return {9, 0, 8};
   case GK_GFX909:  return {9, 0, 9};
+  case GK_GFX90C:  return {9, 0, 12};
   case GK_GFX1010: return {10, 1, 0};
   case GK_GFX1011: return {10, 1, 1};
   case GK_GFX1012: return {10, 1, 2};
diff --git a/llvm/lib/Target/AMDGPU/AMDGPU.td b/llvm/lib/Target/AMDGPU/AMDGPU.td
--- a/llvm/lib/Target/AMDGPU/AMDGPU.td
+++ b/llvm/lib/Target/AMDGPU/AMDGPU.td
@@ -886,6 +886,13 @@
    FeatureXNACK,
    FeatureImageGather4D16Bug]>;
 
+def FeatureISAVersion9_0_C : FeatureSet<
+  [FeatureGFX9,
+   FeatureMadMixInsts,
+   FeatureLDSBankCount32,
+   FeatureXNACK,
+   FeatureImageGather4D16Bug]>;
+
 // TODO: Organize more features into groups.
 def FeatureGroup {
   // Bugs present on gfx10.1.
diff --git a/llvm/lib/Target/AMDGPU/GCNProcessors.td b/llvm/lib/Target/AMDGPU/GCNProcessors.td
--- a/llvm/lib/Target/AMDGPU/GCNProcessors.td
+++ b/llvm/lib/Target/AMDGPU/GCNProcessors.td
@@ -184,6 +184,10 @@
   FeatureISAVersion9_0_9.Features
 >;
 
+def : ProcessorModel<"gfx90c", SIQuarterSpeedModel,
+  FeatureISAVersion9_0_C.Features
+>;
+
 //===----------------------------------------------------------------------===//
 // GCN GFX10.
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
@@ -97,6 +97,7 @@
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX906:  AK = GK_GFX906;  break;
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX908:  AK = GK_GFX908;  break;
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX909:  AK = GK_GFX909;  break;
+  case ELF::EF_AMDGPU_MACH_AMDGCN_GFX90C:  AK = GK_GFX90C;  break;
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1010: AK = GK_GFX1010; break;
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1011: AK = GK_GFX1011; break;
   case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1012: AK = GK_GFX1012; break;
@@ -154,6 +155,7 @@
   case GK_GFX906:  return ELF::EF_AMDGPU_MACH_AMDGCN_GFX906;
   case GK_GFX908:  return ELF::EF_AMDGPU_MACH_AMDGCN_GFX908;
   case GK_GFX909:  return ELF::EF_AMDGPU_MACH_AMDGCN_GFX909;
+  case GK_GFX90C:  return ELF::EF_AMDGPU_MACH_AMDGCN_GFX90C;
   case GK_GFX1010: return ELF::EF_AMDGPU_MACH_AMDGCN_GFX1010;
   case GK_GFX1011: return ELF::EF_AMDGPU_MACH_AMDGCN_GFX1011;
   case GK_GFX1012: return ELF::EF_AMDGPU_MACH_AMDGCN_GFX1012;
diff --git a/llvm/test/CodeGen/AMDGPU/elf-header-flags-mach.ll b/llvm/test/CodeGen/AMDGPU/elf-header-flags-mach.ll
--- a/llvm/test/CodeGen/AMDGPU/elf-header-flags-mach.ll
+++ b/llvm/test/CodeGen/AMDGPU/elf-header-flags-mach.ll
@@ -52,6 +52,7 @@
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX906 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx908 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX908 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx909 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX909 %s
+; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx90c < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX90C %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx1010 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX1010 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx1011 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX1011 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx1012 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=ALL,ARCH-GCN,GFX1012 %s
@@ -103,6 +104,7 @@
 ; GFX908:        EF_AMDGPU_MACH_AMDGCN_GFX908 (0x30)
 ; GFX908-NEXT:   EF_AMDGPU_SRAM_ECC           (0x200)
 ; GFX909:        EF_AMDGPU_MACH_AMDGCN_GFX909 (0x31)
+; GFX90C:        EF_AMDGPU_MACH_AMDGCN_GFX90C (0x32)
 ; GFX1010:       EF_AMDGPU_MACH_AMDGCN_GFX1010 (0x33)
 ; GFX1011:       EF_AMDGPU_MACH_AMDGCN_GFX1011 (0x34)
 ; GFX1012:       EF_AMDGPU_MACH_AMDGCN_GFX1012 (0x35)
diff --git a/llvm/test/Object/AMDGPU/elf-header-flags-mach.yaml b/llvm/test/Object/AMDGPU/elf-header-flags-mach.yaml
--- a/llvm/test/Object/AMDGPU/elf-header-flags-mach.yaml
+++ b/llvm/test/Object/AMDGPU/elf-header-flags-mach.yaml
@@ -166,6 +166,10 @@
 # RUN: llvm-readobj -s -file-headers %t.o.42 | FileCheck --check-prefixes=ELF-ALL,ELF-GFX1032 %s
 # RUN: obj2yaml %t.o.42 | FileCheck --check-prefixes=YAML-GFX1032 %s
 
+# RUN: yaml2obj --docnum=43 %s -o %t.o.43
+# RUN: llvm-readobj -s -file-headers %t.o.43 | FileCheck --check-prefixes=ELF-ALL,ELF-GFX90C %s
+# RUN: obj2yaml %t.o.43 | FileCheck --check-prefixes=YAML-GFX90C %s
+
 # ELF-ALL:     Flags [
 # ELF-R600:      EF_AMDGPU_MACH_R600_R600     (0x1)
 # ELF-R630:      EF_AMDGPU_MACH_R600_R630     (0x2)
@@ -203,6 +207,7 @@
 # ELF-GFX906:    EF_AMDGPU_MACH_AMDGCN_GFX906 (0x2F)
 # ELF-GFX908:    EF_AMDGPU_MACH_AMDGCN_GFX908 (0x30)
 # ELF-GFX909:    EF_AMDGPU_MACH_AMDGCN_GFX909 (0x31)
+# ELF-GFX90C:    EF_AMDGPU_MACH_AMDGCN_GFX90C (0x32)
 # ELF-GFX1010:   EF_AMDGPU_MACH_AMDGCN_GFX1010 (0x33)
 # ELF-GFX1011:   EF_AMDGPU_MACH_AMDGCN_GFX1011 (0x34)
 # ELF-GFX1012:   EF_AMDGPU_MACH_AMDGCN_GFX1012 (0x35)
@@ -247,6 +252,7 @@
 # YAML-GFX906:  Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX906 ]
 # YAML-GFX908:  Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX908 ]
 # YAML-GFX909:  Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX909 ]
+# YAML-GFX90C:  Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX90C ]
 # YAML-GFX1010: Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX1010 ]
 # YAML-GFX1011: Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX1011 ]
 # YAML-GFX1012: Flags: [ EF_AMDGPU_MACH_AMDGCN_GFX1012 ]
@@ -715,3 +721,14 @@
   Machine: EM_AMDGPU
   Flags:   [ EF_AMDGPU_MACH_AMDGCN_GFX1032 ]
 ...
+
+# Doc43
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  OSABI:   ELFOSABI_NONE
+  Type:    ET_REL
+  Machine: EM_AMDGPU
+  Flags:   [ EF_AMDGPU_MACH_AMDGCN_GFX90C ]
+...
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -1779,6 +1779,7 @@
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX906),
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX908),
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX909),
+  LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX90C),
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX1010),
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX1011),
   LLVM_READOBJ_ENUM_ENT(ELF, EF_AMDGPU_MACH_AMDGCN_GFX1012),