Index: lib/Target/AMDGPU/AMDGPUGISel.td
===================================================================
--- lib/Target/AMDGPU/AMDGPUGISel.td
+++ lib/Target/AMDGPU/AMDGPUGISel.td
@@ -34,6 +34,14 @@
     GIComplexOperandMatcher<s32, "selectVOP3OMods">,
     GIComplexPatternEquiv<VOP3OMods>;
 
+def gi_vop3opselmods0 :
+    GIComplexOperandMatcher<s32, "selectVOP3OpSelMods0">,
+    GIComplexPatternEquiv<VOP3OpSelMods0>;
+
+def gi_vop3opselmods :
+    GIComplexOperandMatcher<s32, "selectVOP3OpSelMods">,
+    GIComplexPatternEquiv<VOP3OpSelMods>;
+
 def gi_smrd_imm :
     GIComplexOperandMatcher<s64, "selectSmrdImm">,
     GIComplexPatternEquiv<SMRDImm>;
Index: lib/Target/AMDGPU/AMDGPUInstrInfo.td
===================================================================
--- lib/Target/AMDGPU/AMDGPUInstrInfo.td
+++ lib/Target/AMDGPU/AMDGPUInstrInfo.td
@@ -319,7 +319,7 @@
   []
 >;
 
-def AMDGPUfmed3 : SDNode<"AMDGPUISD::FMED3", SDTFPTernaryOp, []>;
+def AMDGPUfmed3_impl : SDNode<"AMDGPUISD::FMED3", SDTFPTernaryOp, []>;
 
 def AMDGPUfdot2 : SDNode<"AMDGPUISD::FDOT2",
                   SDTypeProfile<1, 4, [SDTCisSameAs<0, 3>, SDTCisSameAs<1, 2>,
@@ -437,3 +437,7 @@
 def AMDGPUldexp : PatFrags<(ops node:$src0, node:$src1),
   [(int_amdgcn_ldexp node:$src0, node:$src1),
    (AMDGPUldexp_impl node:$src0, node:$src1)]>;
+
+def AMDGPUfmed3 : PatFrags<(ops node:$src0, node:$src1, node:$src2),
+  [(int_amdgcn_fmed3 node:$src0, node:$src1, node:$src2),
+   (AMDGPUfmed3_impl node:$src0, node:$src1, node:$src2)]>;
Index: lib/Target/AMDGPU/AMDGPUInstructionSelector.h
===================================================================
--- lib/Target/AMDGPU/AMDGPUInstructionSelector.h
+++ lib/Target/AMDGPU/AMDGPUInstructionSelector.h
@@ -113,6 +113,11 @@
   InstructionSelector::ComplexRendererFns
   selectVOP3Mods(MachineOperand &Root) const;
 
+  InstructionSelector::ComplexRendererFns
+  selectVOP3OpSelMods0(MachineOperand &Root) const;
+  InstructionSelector::ComplexRendererFns
+  selectVOP3OpSelMods(MachineOperand &Root) const;
+
   InstructionSelector::ComplexRendererFns
   selectSmrdImm(MachineOperand &Root) const;
   InstructionSelector::ComplexRendererFns
Index: lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -1437,6 +1437,25 @@
   }};
 }
 
+InstructionSelector::ComplexRendererFns
+AMDGPUInstructionSelector::selectVOP3OpSelMods0(MachineOperand &Root) const {
+  // FIXME: Handle clamp and op_sel
+  return {{
+      [=](MachineInstrBuilder &MIB) { MIB.addReg(Root.getReg()); },
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }, // src_mods
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }  // clamp
+  }};
+}
+
+InstructionSelector::ComplexRendererFns
+AMDGPUInstructionSelector::selectVOP3OpSelMods(MachineOperand &Root) const {
+  // FIXME: Handle op_sel
+  return {{
+      [=](MachineInstrBuilder &MIB) { MIB.addReg(Root.getReg()); },
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); } // src_mods
+  }};
+}
+
 InstructionSelector::ComplexRendererFns
 AMDGPUInstructionSelector::selectSmrdImm(MachineOperand &Root) const {
   MachineRegisterInfo &MRI =
Index: test/CodeGen/AMDGPU/GlobalISel/inst-select-amdgcn.fmed3.mir
===================================================================
--- /dev/null
+++ test/CodeGen/AMDGPU/GlobalISel/inst-select-amdgcn.fmed3.mir
@@ -0,0 +1,205 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -mcpu=tahiti -run-pass=instruction-select -verify-machineinstrs %s -o -  | FileCheck -check-prefix=GCN %s
+
+---
+name: fmed3_s32_vvvv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr2
+
+    ; GCN-LABEL: name: fmed3_s32_vvvv
+    ; GCN: liveins: $vgpr0, $vgpr1, $vgpr2
+    ; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr1
+    ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr2
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:vgpr(s32) = COPY $vgpr0
+    %1:vgpr(s32) = COPY $vgpr1
+    %2:vgpr(s32) = COPY $vgpr2
+    %3:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %2
+    S_ENDPGM 0, implicit %3
+...
+
+---
+name: fmed3_s32_vsvv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1
+
+    ; GCN-LABEL: name: fmed3_s32_vsvv
+    ; GCN: liveins: $sgpr0, $vgpr0, $vgpr1
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr1
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = COPY $vgpr1
+    %3:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %2
+    S_ENDPGM 0, implicit %3
+...
+
+---
+name: fmed3_s32_vvsv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1
+
+    ; GCN-LABEL: name: fmed3_s32_vvsv
+    ; GCN: liveins: $sgpr0, $vgpr0, $vgpr1
+    ; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr1
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:vgpr(s32) = COPY $vgpr0
+    %1:sgpr(s32) = COPY $sgpr0
+    %2:vgpr(s32) = COPY $vgpr1
+    %3:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %2
+    S_ENDPGM 0, implicit %3
+...
+
+---
+name: fmed3_s32_vvvs
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1
+
+    ; GCN-LABEL: name: fmed3_s32_vvvs
+    ; GCN: liveins: $sgpr0, $vgpr0, $vgpr1
+    ; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY2:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:vgpr(s32) = COPY $vgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:sgpr(s32) = COPY $sgpr0
+    %3:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %2
+    S_ENDPGM 0, implicit %3
+...
+
+
+# Same SGPR used, so doesn't violate the constant bus restriction.
+---
+name: fmed3_s32_vssv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0
+
+    ; GCN-LABEL: name: fmed3_s32_vssv
+    ; GCN: liveins: $sgpr0, $vgpr0
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY]], 0, [[COPY1]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %0, %1
+    S_ENDPGM 0, implicit %2
+...
+
+---
+name: fmed3_s32_vsvs
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0
+
+    ; GCN-LABEL: name: fmed3_s32_vsvs
+    ; GCN: liveins: $sgpr0, $vgpr0
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY1]], 0, [[COPY]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %0
+    S_ENDPGM 0, implicit %2
+...
+
+---
+name: fmed3_s32_vvss
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0
+
+    ; GCN-LABEL: name: fmed3_s32_vvss
+    ; GCN: liveins: $sgpr0, $vgpr0
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY1]], 0, [[COPY]], 0, [[COPY]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %1, %0, %0
+    S_ENDPGM 0, implicit %2
+...
+
+---
+name: fmed3_s32_vsss
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0
+
+    ; GCN-LABEL: name: fmed3_s32_vsss
+    ; GCN: liveins: $sgpr0, $vgpr0
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[V_MED3_F32_:%[0-9]+]]:vgpr_32 = V_MED3_F32 0, [[COPY]], 0, [[COPY]], 0, [[COPY]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %0, %0
+    S_ENDPGM 0, implicit %1
+...
+
+
+# FIXME: This should probably have been fixed by RegBankSelect, but we should fail to select it.
+# ---
+# name: fmed3_s32_vssv_constant_bus_violation
+# legalized: true
+# regBankSelected: true
+# tracksRegLiveness: true
+
+# body: |
+#   bb.0:
+#     liveins: $sgpr0, $sgpr1, $vgpr0
+
+#     %0:sgpr(s32) = COPY $sgpr0
+#     %1:sgpr(s32) = COPY $sgpr1
+#     %2:vgpr(s32) = COPY $vgpr0
+#     %3:vgpr(s32) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %0, %1, %2
+#     S_ENDPGM 0, implicit %3
+# ...
Index: test/CodeGen/AMDGPU/GlobalISel/inst-select-amdgcn.fmed3.s16.mir
===================================================================
--- /dev/null
+++ test/CodeGen/AMDGPU/GlobalISel/inst-select-amdgcn.fmed3.s16.mir
@@ -0,0 +1,61 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -mcpu=gfx900 -run-pass=instruction-select -verify-machineinstrs %s -o -  | FileCheck -check-prefix=GCN %s
+# RUN: llc -march=amdgcn -mcpu=fiji -run-pass=instruction-select -verify-machineinstrs -global-isel-abort=2 -pass-remarks-missed='gisel*'  %s -o /dev/null 2>&1 | FileCheck -check-prefix=VI-ERR %s
+
+# VI-ERR-NOT: remark
+# VI-ERR: remark: <unknown>:0:0: cannot select: %6:vgpr(s16) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %3:vgpr(s16), %4:vgpr(s16), %5:vgpr(s16) (in function: fmed3_s16_vvvv)
+# VI-ERR-NEXT: remark: <unknown>:0:0: cannot select: %6:vgpr(s16) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %3:sgpr(s16), %4:vgpr(s16), %5:vgpr(s16) (in function: fmed3_s16_vsvv)
+# VI-ERR-NOT: remark
+---
+name: fmed3_s16_vvvv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr2
+
+    ; GCN-LABEL: name: fmed3_s16_vvvv
+    ; GCN: liveins: $vgpr0, $vgpr1, $vgpr2
+    ; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr1
+    ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr2
+    ; GCN: [[V_MED3_F16_:%[0-9]+]]:vgpr_32 = V_MED3_F16 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F16_]]
+    %0:vgpr(s32) = COPY $vgpr0
+    %1:vgpr(s32) = COPY $vgpr1
+    %2:vgpr(s32) = COPY $vgpr2
+    %3:vgpr(s16) = G_TRUNC %0
+    %4:vgpr(s16) = G_TRUNC %1
+    %5:vgpr(s16) = G_TRUNC %2
+    %6:vgpr(s16) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %3, %4, %5
+    S_ENDPGM 0, implicit %6
+...
+
+---
+name: fmed3_s16_vsvv
+legalized: true
+regBankSelected: true
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1
+
+    ; GCN-LABEL: name: fmed3_s16_vsvv
+    ; GCN: liveins: $sgpr0, $vgpr0, $vgpr1
+    ; GCN: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr1
+    ; GCN: [[V_MED3_F16_:%[0-9]+]]:vgpr_32 = V_MED3_F16 0, [[COPY]], 0, [[COPY1]], 0, [[COPY2]], 0, 0, implicit $exec
+    ; GCN: S_ENDPGM 0, implicit [[V_MED3_F16_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = COPY $vgpr1
+    %3:sgpr(s16) = G_TRUNC %0
+    %4:vgpr(s16) = G_TRUNC %1
+    %5:vgpr(s16) = G_TRUNC %2
+    %6:vgpr(s16) = G_INTRINSIC intrinsic(@llvm.amdgcn.fmed3), %3, %4, %5
+    S_ENDPGM 0, implicit %6
+...