add intrinsic permlanex16

Author: PankajDwivedi-25

llvm/lib/Target/AMDGPU/AMDGPUSearchableTables.td

@@ -317,7 +317,6 @@ def : SourceOfDivergence<int_amdgcn_live_mask>;
 def : SourceOfDivergence<int_amdgcn_ds_swizzle>;
 def : SourceOfDivergence<int_amdgcn_ds_ordered_add>;
 def : SourceOfDivergence<int_amdgcn_ds_ordered_swap>;
-def : SourceOfDivergence<int_amdgcn_permlanex16>;
 def : SourceOfDivergence<int_amdgcn_permlane16_var>;
 def : SourceOfDivergence<int_amdgcn_permlanex16_var>;
 def : SourceOfDivergence<int_amdgcn_mov_dpp>;

llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp

@@ -1427,6 +1427,7 @@ bool GCNTTIImpl::isSpecialUniformIntrinsic(const Instruction &I) const {
   if (const auto *II = dyn_cast<IntrinsicInst>(&I)) {
     switch (II->getIntrinsicID()) {
     case Intrinsic::amdgcn_permlane16:
+    case Intrinsic::amdgcn_permlanex16:
       return true;
     default:
       return false;

llvm/test/Analysis/UniformityAnalysis/AMDGPU/intrinsics.ll

@@ -14,7 +14,7 @@ define amdgpu_kernel void @v_permlane16_b32(ptr addrspace(1) %out, i32 %src0, i3
   ret void
 }
 
-; CHECK: DIVERGENT: %v = call i32 @llvm.amdgcn.permlanex16.i32(i32 %src0, i32 %src0, i32 %src1, i32 %src2, i1 false, i1 false) #0
+; CHECK: ALL VALUES UNIFORM
 define amdgpu_kernel void @v_permlanex16_b32(ptr addrspace(1) %out, i32 %src0, i32 %src1, i32 %src2) #0 {
   %v = call i32 @llvm.amdgcn.permlanex16.i32(i32 %src0, i32 %src0, i32 %src1, i32 %src2, i1 false, i1 false) #0
   store i32 %v, ptr addrspace(1) %out

llvm/test/Analysis/UniformityAnalysis/AMDGPU/uniform_intrinsic.ll

@@ -7,5 +7,13 @@ define amdgpu_kernel void @v_permlane16_b32(ptr addrspace(1) %out, i32 %src0, i3
   store i32 %v, ptr addrspace(1) %out
   ret void
 }
+
+; CHECK: ALL VALUES UNIFORM
+define amdgpu_kernel void @v_permlanex16_b32(ptr addrspace(1) %out, i32 %src0, i32 %src1, i32 %src2) #0 {
+  %v = call i32 @llvm.amdgcn.permlanex16.i32(i32 %src0, i32 %src0, i32 %src1, i32 %src2, i1 false, i1 false) #0
+  store i32 %v, ptr addrspace(1) %out
+  ret void
+}
+
 ;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
 ; CHECK: {{.*}}