AMDGPU: Remove dead kill handling

At one point a custom node was used for kill handling, but now the
intrinsic is directly selected. Remove leftover pattern machinery.

Author: arsenm

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

@@ -4340,7 +4340,6 @@ const char* AMDGPUTargetLowering::getTargetNodeName(unsigned Opcode) const {
   NODE_NAME_CASE(CONST_DATA_PTR)
   NODE_NAME_CASE(PC_ADD_REL_OFFSET)
   NODE_NAME_CASE(LDS)
-  NODE_NAME_CASE(KILL)
   NODE_NAME_CASE(DUMMY_CHAIN)
   case AMDGPUISD::FIRST_MEM_OPCODE_NUMBER: break;
   NODE_NAME_CASE(LOAD_D16_HI)

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h

@@ -479,7 +479,6 @@ enum NodeType : unsigned {
   CONST_DATA_PTR,
   PC_ADD_REL_OFFSET,
   LDS,
-  KILL,
   DUMMY_CHAIN,
   FIRST_MEM_OPCODE_NUMBER = ISD::FIRST_TARGET_MEMORY_OPCODE,
   LOAD_D16_HI,

llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.td

@@ -329,9 +329,6 @@ def AMDGPUfdot2 : SDNode<"AMDGPUISD::FDOT2",
 
 def AMDGPUperm : SDNode<"AMDGPUISD::PERM", AMDGPUDTIntTernaryOp, []>;
 
-def AMDGPUkill : SDNode<"AMDGPUISD::KILL", AMDGPUKillSDT,
-  [SDNPHasChain, SDNPSideEffect]>;
-
 // SI+ export
 def AMDGPUExportOp : SDTypeProfile<0, 8, [
   SDTCisInt<0>,       // i8 tgt

llvm/lib/Target/AMDGPU/SIInstructions.td

@@ -731,12 +731,6 @@ def : GCNPat<
   (SI_ELSE $src, $target, 0)
 >;
 
-def : Pat <
-  // -1.0 as i32 (LowerINTRINSIC_VOID converts all other constants to -1.0)
-  (AMDGPUkill (i32 -1082130432)),
-  (SI_KILL_I1_PSEUDO (i1 0), 0)
->;
-
 def : Pat <
   (int_amdgcn_kill i1:$src),
   (SI_KILL_I1_PSEUDO SCSrc_i1:$src, 0)
@@ -747,11 +741,6 @@ def : Pat <
   (SI_KILL_I1_PSEUDO SCSrc_i1:$src, -1)
 >;
 
-def : Pat <
-  (AMDGPUkill i32:$src),
-  (SI_KILL_F32_COND_IMM_PSEUDO VSrc_b32:$src, 0, 3) // 3 means SETOGE
->;
-
 def : Pat <
   (int_amdgcn_kill (i1 (setcc f32:$src, InlineImmFP32:$imm, cond:$cond))),
   (SI_KILL_F32_COND_IMM_PSEUDO VSrc_b32:$src, (bitcast_fpimm_to_i32 $imm), (cond_as_i32imm $cond))