From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Tue, 31 Jan 2017 03:07:46 +0000 (+0000)
Subject: AMDGPU: Generalize matching of v_med3_f32
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3b595d2304a3a0316b388406a7b10962e35d4b14;p=llvm

AMDGPU: Generalize matching of v_med3_f32

I think this is safe as long as no inputs are known to ever
be nans.

Also add an intrinsic for fmed3 to be able to handle all safe
math cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293598 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/IR/IntrinsicsAMDGPU.td b/include/llvm/IR/IntrinsicsAMDGPU.td
index 05fbac176fb..ecce7a882f5 100644
--- a/include/llvm/IR/IntrinsicsAMDGPU.td
+++ b/include/llvm/IR/IntrinsicsAMDGPU.td
@@ -206,6 +206,11 @@ def int_amdgcn_class : Intrinsic<
   [llvm_i1_ty], [llvm_anyfloat_ty, llvm_i32_ty], [IntrNoMem]
 >;
 
+def int_amdgcn_fmed3 : GCCBuiltin<"__builtin_amdgcn_fmed3">,
+  Intrinsic<[llvm_anyfloat_ty],
+    [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]
+>;
+
 def int_amdgcn_cubeid : GCCBuiltin<"__builtin_amdgcn_cubeid">,
   Intrinsic<[llvm_float_ty],
     [llvm_float_ty, llvm_float_ty, llvm_float_ty], [IntrNoMem]
diff --git a/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp b/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
index 774810e2e01..e02ced04f08 100644
--- a/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
+++ b/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
@@ -80,6 +80,7 @@ public:
 
 private:
   SDValue foldFrameIndex(SDValue N) const;
+  bool isNoNanSrc(SDValue N) const;
   bool isInlineImmediate(const SDNode *N) const;
   bool FoldOperand(SDValue &Src, SDValue &Sel, SDValue &Neg, SDValue &Abs,
                    const R600InstrInfo *TII);
@@ -143,6 +144,8 @@ private:
   bool SelectSMRDBufferImm32(SDValue Addr, SDValue &Offset) const;
   bool SelectSMRDBufferSgpr(SDValue Addr, SDValue &Offset) const;
   bool SelectMOVRELOffset(SDValue Index, SDValue &Base, SDValue &Offset) const;
+
+  bool SelectVOP3Mods_NNaN(SDValue In, SDValue &Src, SDValue &SrcMods) const;
   bool SelectVOP3Mods(SDValue In, SDValue &Src, SDValue &SrcMods) const;
   bool SelectVOP3NoMods(SDValue In, SDValue &Src, SDValue &SrcMods) const;
   bool SelectVOP3Mods0(SDValue In, SDValue &Src, SDValue &SrcMods,
@@ -188,6 +191,17 @@ bool AMDGPUDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
   return SelectionDAGISel::runOnMachineFunction(MF);
 }
 
+bool AMDGPUDAGToDAGISel::isNoNanSrc(SDValue N) const {
+  if (TM.Options.NoNaNsFPMath)
+    return true;
+
+  // TODO: Move into isKnownNeverNaN
+  if (const auto *BO = dyn_cast<BinaryWithFlagsSDNode>(N))
+    return BO->Flags.hasNoNaNs();
+
+  return CurDAG->isKnownNeverNaN(N);
+}
+
 bool AMDGPUDAGToDAGISel::isInlineImmediate(const SDNode *N) const {
   const SIInstrInfo *TII
     = static_cast<const SISubtarget *>(Subtarget)->getInstrInfo();
@@ -1569,6 +1583,12 @@ bool AMDGPUDAGToDAGISel::SelectVOP3Mods(SDValue In, SDValue &Src,
   return true;
 }
 
+bool AMDGPUDAGToDAGISel::SelectVOP3Mods_NNaN(SDValue In, SDValue &Src,
+                                             SDValue &SrcMods) const {
+  SelectVOP3Mods(In, Src, SrcMods);
+  return isNoNanSrc(Src);
+}
+
 bool AMDGPUDAGToDAGISel::SelectVOP3NoMods(SDValue In, SDValue &Src,
                                          SDValue &SrcMods) const {
   bool Res = SelectVOP3Mods(In, Src, SrcMods);
diff --git a/lib/Target/AMDGPU/AMDGPUInstructions.td b/lib/Target/AMDGPU/AMDGPUInstructions.td
index 606b6cea2e4..004b10f5d20 100644
--- a/lib/Target/AMDGPU/AMDGPUInstructions.td
+++ b/lib/Target/AMDGPU/AMDGPUInstructions.td
@@ -635,6 +635,8 @@ def smax_oneuse : HasOneUseBinOp<smax>;
 def smin_oneuse : HasOneUseBinOp<smin>;
 def umax_oneuse : HasOneUseBinOp<umax>;
 def umin_oneuse : HasOneUseBinOp<umin>;
+def fminnum_oneuse : HasOneUseBinOp<fminnum>;
+def fmaxnum_oneuse : HasOneUseBinOp<fmaxnum>;
 } // Properties = [SDNPCommutative, SDNPAssociative]
 
 def sub_oneuse : HasOneUseBinOp<sub>;
diff --git a/lib/Target/AMDGPU/SIISelLowering.cpp b/lib/Target/AMDGPU/SIISelLowering.cpp
index 89d3a72fae4..7e49fc28703 100644
--- a/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -2795,6 +2795,9 @@ SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
     return DAG.getNode(AMDGPUISD::SETCC, DL, VT, Op.getOperand(1),
                        Op.getOperand(2), DAG.getCondCode(CCOpcode));
   }
+  case Intrinsic::amdgcn_fmed3:
+    return DAG.getNode(AMDGPUISD::FMED3, DL, VT,
+                       Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
   case Intrinsic::amdgcn_fmul_legacy:
     return DAG.getNode(AMDGPUISD::FMUL_LEGACY, DL, VT,
                        Op.getOperand(1), Op.getOperand(2));
diff --git a/lib/Target/AMDGPU/SIInstrInfo.td b/lib/Target/AMDGPU/SIInstrInfo.td
index 6f4746b7559..cf9b9c5a145 100644
--- a/lib/Target/AMDGPU/SIInstrInfo.td
+++ b/lib/Target/AMDGPU/SIInstrInfo.td
@@ -603,6 +603,9 @@ def VOP3Mods0Clamp0OMod : ComplexPattern<untyped, 4, "SelectVOP3Mods0Clamp0OMod"
 def VOP3Mods  : ComplexPattern<untyped, 2, "SelectVOP3Mods">;
 def VOP3NoMods : ComplexPattern<untyped, 2, "SelectVOP3NoMods">;
 
+// VOP3Mods, but the input source is known to never be NaN.
+def VOP3Mods_nnan : ComplexPattern<fAny, 2, "SelectVOP3Mods_NNaN">;
+
 //===----------------------------------------------------------------------===//
 // SI assembler operands
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/AMDGPU/SIInstructions.td b/lib/Target/AMDGPU/SIInstructions.td
index 06516b24f32..2a4b0951ac4 100644
--- a/lib/Target/AMDGPU/SIInstructions.td
+++ b/lib/Target/AMDGPU/SIInstructions.td
@@ -1125,6 +1125,20 @@ def : SHA256MaPattern <V_BFI_B32, V_XOR_B32_e64>;
 def : IntMed3Pat<V_MED3_I32, smax, smax_oneuse, smin_oneuse>;
 def : IntMed3Pat<V_MED3_U32, umax, umax_oneuse, umin_oneuse>;
 
+// This matches 16 permutations of
+// max(min(x, y), min(max(x, y), z))
+class FPMed3Pat<ValueType vt,
+                Instruction med3Inst> : Pat<
+  (fmaxnum (fminnum_oneuse (VOP3Mods_nnan vt:$src0, i32:$src0_mods),
+                           (VOP3Mods_nnan vt:$src1, i32:$src1_mods)),
+           (fminnum_oneuse (fmaxnum_oneuse (VOP3Mods_nnan vt:$src0, i32:$src0_mods),
+                                           (VOP3Mods_nnan vt:$src1, i32:$src1_mods)),
+                           (vt (VOP3Mods_nnan vt:$src2, i32:$src2_mods)))),
+  (med3Inst $src0_mods, $src0, $src1_mods, $src1, $src2_mods, $src2, DSTCLAMP.NONE, DSTOMOD.NONE)
+>;
+
+def : FPMed3Pat<f32, V_MED3_F32>;
+
 
 // Undo sub x, c -> add x, -c canonicalization since c is more likely
 // an inline immediate than -c.
diff --git a/test/CodeGen/AMDGPU/fmed3.ll b/test/CodeGen/AMDGPU/fmed3.ll
index 44889c9c472..0213acdc18e 100644
--- a/test/CodeGen/AMDGPU/fmed3.ll
+++ b/test/CodeGen/AMDGPU/fmed3.ll
@@ -1,12 +1,6 @@
 ; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=NOSNAN -check-prefix=GCN %s
 ; RUN: llc -march=amdgcn -mattr=+fp-exceptions -verify-machineinstrs < %s | FileCheck -check-prefix=SNAN -check-prefix=GCN %s
 
-declare i32 @llvm.amdgcn.workitem.id.x() #0
-declare float @llvm.minnum.f32(float, float) #0
-declare float @llvm.maxnum.f32(float, float) #0
-declare double @llvm.minnum.f64(double, double) #0
-declare double @llvm.maxnum.f64(double, double) #0
-
 ; GCN-LABEL: {{^}}v_test_nnan_input_fmed3_r_i_i_f32:
 ; GCN: v_add_f32_e32 [[ADD:v[0-9]+]], 1.0, v{{[0-9]+}}
 ; GCN: v_med3_f32 v{{[0-9]+}}, [[ADD]], 2.0, 4.0
@@ -165,6 +159,738 @@ define void @v_test_legacy_fmed3_r_i_i_f32(float addrspace(1)* %out, float addrs
   ret void
 }
 
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_srcmod0:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, -[[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat0_srcmod0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %a.fneg = fsub float -0.0, %a
+  %tmp0 = call float @llvm.minnum.f32(float %a.fneg, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.fneg, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_srcmod1:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], -[[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat0_srcmod1(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %b.fneg = fsub float -0.0, %b
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b.fneg)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b.fneg)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_srcmod2:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], -[[C]]
+define void @v_test_global_nnans_med3_f32_pat0_srcmod2(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %c.fneg = fsub float -0.0, %c
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.fneg)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_srcmod012:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, -[[A]], |[[B]]|, -|[[C]]|
+define void @v_test_global_nnans_med3_f32_pat0_srcmod012(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.fneg = fsub float -0.0, %a
+  %b.fabs = call float @llvm.fabs.f32(float %b)
+  %c.fabs = call float @llvm.fabs.f32(float %c)
+  %c.fabs.fneg = fsub float -0.0, %c.fabs
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.fneg, float %b.fabs)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.fneg, float %b.fabs)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.fabs.fneg)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_negabs012:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, -|[[A]]|, -|[[B]]|, -|[[C]]|
+define void @v_test_global_nnans_med3_f32_pat0_negabs012(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.fabs = call float @llvm.fabs.f32(float %a)
+  %a.fabs.fneg = fsub float -0.0, %a.fabs
+  %b.fabs = call float @llvm.fabs.f32(float %b)
+  %b.fabs.fneg = fsub float -0.0, %b.fabs
+  %c.fabs = call float @llvm.fabs.f32(float %c)
+  %c.fabs.fneg = fsub float -0.0, %c.fabs
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.fabs.fneg, float %b.fabs.fneg)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.fabs.fneg, float %b.fabs.fneg)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.fabs.fneg)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_nnan_inputs_med3_f32_pat0:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN-DAG: v_add_f32_e32 [[A_ADD:v[0-9]+]], 1.0, [[A]]
+; GCN-DAG: v_add_f32_e32 [[B_ADD:v[0-9]+]], 2.0, [[B]]
+; GCN-DAG: v_add_f32_e32 [[C_ADD:v[0-9]+]], 4.0, [[C]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A_ADD]], [[B_ADD]], [[C_ADD]]
+define void @v_nnan_inputs_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.nnan = fadd nnan float %a, 1.0
+  %b.nnan = fadd nnan float %b, 2.0
+  %c.nnan = fadd nnan float %c, 4.0
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.nnan, float %b.nnan)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.nnan, float %b.nnan)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.nnan)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; 16 combinations
+
+; 0: max(min(x, y), min(max(x, y), z))
+; 1: max(min(x, y), min(max(y, x), z))
+; 2: max(min(x, y), min(z, max(x, y)))
+; 3: max(min(x, y), min(z, max(y, x)))
+; 4: max(min(y, x), min(max(x, y), z))
+; 5: max(min(y, x), min(max(y, x), z))
+; 6: max(min(y, x), min(z, max(x, y)))
+; 7: max(min(y, x), min(z, max(y, x)))
+;
+; + commute outermost max
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat1:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat1(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat2:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat2(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat3:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat3(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat4:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat4(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat5:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat5(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat6:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat6(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat7:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat7(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat8:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat8(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat9:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat9(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat10:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat10(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat11:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat11(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat12:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat12(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat13:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat13(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat14:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[A]], [[B]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat14(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat15:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_med3_f32 v{{[0-9]+}}, [[B]], [[A]], [[C]]
+define void @v_test_global_nnans_med3_f32_pat15(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %b, float %a)
+  %tmp1 = call float @llvm.maxnum.f32(float %b, float %a)
+  %tmp2 = call float @llvm.minnum.f32(float %c, float %tmp1)
+  %med3 = call float @llvm.maxnum.f32(float %tmp2, float %tmp0)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; ---------------------------------------------------------------------
+; Negative patterns
+; ---------------------------------------------------------------------
+
+; GCN-LABEL: {{^}}v_test_safe_med3_f32_pat0_multi_use0:
+; GCN: v_min_f32
+; GCN: v_max_f32
+; GCN: v_min_f32
+; GCN: v_max_f32
+define void @v_test_safe_med3_f32_pat0_multi_use0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  store volatile float %tmp0, float addrspace(1)* undef
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_safe_med3_f32_pat0_multi_use1:
+define void @v_test_safe_med3_f32_pat0_multi_use1(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  store volatile float %tmp1, float addrspace(1)* undef
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_safe_med3_f32_pat0_multi_use2:
+define void @v_test_safe_med3_f32_pat0_multi_use2(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  store volatile float %tmp2, float addrspace(1)* undef
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+
+; GCN-LABEL: {{^}}v_test_safe_med3_f32_pat0:
+define void @v_test_safe_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %tmp0 = call float @llvm.minnum.f32(float %a, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_nnan_inputs_missing0_med3_f32_pat0:
+define void @v_nnan_inputs_missing0_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.nnan = fadd float %a, 1.0
+  %b.nnan = fadd nnan float %b, 2.0
+  %c.nnan = fadd nnan float %c, 4.0
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.nnan, float %b.nnan)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.nnan, float %b.nnan)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.nnan)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_nnan_inputs_missing1_med3_f32_pat0:
+define void @v_nnan_inputs_missing1_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.nnan = fadd nnan float %a, 1.0
+  %b.nnan = fadd float %b, 2.0
+  %c.nnan = fadd nnan float %c, 4.0
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.nnan, float %b.nnan)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.nnan, float %b.nnan)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.nnan)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_nnan_inputs_missing2_med3_f32_pat0:
+define void @v_nnan_inputs_missing2_med3_f32_pat0(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #1 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+
+  %a.nnan = fadd nnan float %a, 1.0
+  %b.nnan = fadd nnan float %b, 2.0
+  %c.nnan = fadd float %c, 4.0
+
+  %tmp0 = call float @llvm.minnum.f32(float %a.nnan, float %b.nnan)
+  %tmp1 = call float @llvm.maxnum.f32(float %a.nnan, float %b.nnan)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c.nnan)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_global_nnans_med3_f32_pat0_srcmod0_mismatch:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_min_f32
+; GCN: v_max_f32
+; GCN: v_min_f32
+; GCN: v_max_f32
+define void @v_test_global_nnans_med3_f32_pat0_srcmod0_mismatch(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %a.fneg = fsub float -0.0, %a
+  %tmp0 = call float @llvm.minnum.f32(float %a.fneg, float %b)
+  %tmp1 = call float @llvm.maxnum.f32(float %a, float %b)
+  %tmp2 = call float @llvm.minnum.f32(float %tmp1, float %c)
+  %med3 = call float @llvm.maxnum.f32(float %tmp0, float %tmp2)
+  store float %med3, float addrspace(1)* %outgep
+  ret void
+}
+
+; A simple min and max is not sufficient
+; GCN-LABEL: {{^}}v_test_global_nnans_min_max_f32:
+; GCN: {{buffer_|flat_}}load_dword [[A:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[B:v[0-9]+]]
+; GCN: {{buffer_|flat_}}load_dword [[C:v[0-9]+]]
+; GCN: v_max_f32_e32 [[MAX:v[0-9]+]], [[B]], [[A]]
+; GCN: v_min_f32_e32 v{{[0-9]+}}, [[C]], [[MAX]]
+define void @v_test_global_nnans_min_max_f32(float addrspace(1)* %out, float addrspace(1)* %aptr, float addrspace(1)* %bptr, float addrspace(1)* %cptr) #2 {
+  %tid = call i32 @llvm.amdgcn.workitem.id.x()
+  %gep0 = getelementptr float, float addrspace(1)* %aptr, i32 %tid
+  %gep1 = getelementptr float, float addrspace(1)* %bptr, i32 %tid
+  %gep2 = getelementptr float, float addrspace(1)* %cptr, i32 %tid
+  %outgep = getelementptr float, float addrspace(1)* %out, i32 %tid
+  %a = load volatile float, float addrspace(1)* %gep0
+  %b = load volatile float, float addrspace(1)* %gep1
+  %c = load volatile float, float addrspace(1)* %gep2
+  %max = call float @llvm.maxnum.f32(float %a, float %b)
+  %minmax = call float @llvm.minnum.f32(float %max, float %c)
+  store float %minmax, float addrspace(1)* %outgep
+  ret void
+}
+
+declare i32 @llvm.amdgcn.workitem.id.x() #0
+declare float @llvm.fabs.f32(float) #0
+declare float @llvm.minnum.f32(float, float) #0
+declare float @llvm.maxnum.f32(float, float) #0
+declare double @llvm.minnum.f64(double, double) #0
+declare double @llvm.maxnum.f64(double, double) #0
+
 attributes #0 = { nounwind readnone }
 attributes #1 = { nounwind "unsafe-fp-math"="false" "no-nans-fp-math"="false" }
 attributes #2 = { nounwind "unsafe-fp-math"="false" "no-nans-fp-math"="true" }
diff --git a/test/CodeGen/AMDGPU/llvm.amdgcn.fmed3.ll b/test/CodeGen/AMDGPU/llvm.amdgcn.fmed3.ll
new file mode 100644
index 00000000000..010599d3b29
--- /dev/null
+++ b/test/CodeGen/AMDGPU/llvm.amdgcn.fmed3.ll
@@ -0,0 +1,28 @@
+; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+
+; GCN-LABEL: {{^}}test_fmed3:
+; GCN: v_med3_f32 v{{[0-9]+}}, s{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}}
+define void @test_fmed3(float addrspace(1)* %out, float %src0, float %src1, float %src2) #1 {
+  %mad = call float @llvm.amdgcn.fmed3.f32(float %src0, float %src1, float %src2)
+  store float %mad, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fmed3_srcmods:
+; GCN: v_med3_f32 v{{[0-9]+}}, -s{{[0-9]+}}, |v{{[0-9]+}}|, -|v{{[0-9]+}}|
+define void @test_fmed3_srcmods(float addrspace(1)* %out, float %src0, float %src1, float %src2) #1 {
+  %src0.fneg = fsub float -0.0, %src0
+  %src1.fabs = call float @llvm.fabs.f32(float %src1)
+  %src2.fabs = call float @llvm.fabs.f32(float %src2)
+  %src2.fneg.fabs = fsub float -0.0, %src2.fabs
+  %mad = call float @llvm.amdgcn.fmed3.f32(float %src0.fneg, float %src1.fabs, float %src2.fneg.fabs)
+  store float %mad, float addrspace(1)* %out
+  ret void
+}
+
+declare float @llvm.amdgcn.fmed3.f32(float, float, float) #0
+declare float @llvm.fabs.f32(float) #0
+
+attributes #0 = { nounwind readnone }
+attributes #1 = { nounwind }