[llvm] r321747 - [X86] Remove useless custom inserter for 64-bit TAILJMP and TCRETURN opcodes

[Craig Topper via llvm-commits]

Author: ctopper
Date: Wed Jan  3 10:20:36 2018
New Revision: 321747

URL: http://llvm.org/viewvc/llvm-project?rev=321747&view=rev
Log:
[X86] Remove useless custom inserter for 64-bit TAILJMP and TCRETURN opcodes

This custom inserter was added in r124272 at which time it added about bunch of Defs for Win64. In r150708, those defs were removed leaving only the "return BB". So I think this means the custom inserter is a NOP these days.

This patch removes the remaining code and stops tagging the instructions for custom insertion

Differential Revision: https://reviews.llvm.org/D41671

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
    llvm/trunk/lib/Target/X86/X86InstrControl.td

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=321747&r1=321746&r2=321747&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Wed Jan  3 10:20:36 2018
@@ -27551,16 +27551,6 @@ X86TargetLowering::EmitInstrWithCustomIn
 
   switch (MI.getOpcode()) {
   default: llvm_unreachable("Unexpected instr type to insert");
-  case X86::TAILJMPd64:
-  case X86::TAILJMPr64:
-  case X86::TAILJMPm64:
-  case X86::TAILJMPr64_REX:
-  case X86::TAILJMPm64_REX:
-    llvm_unreachable("TAILJMP64 would not be touched here.");
-  case X86::TCRETURNdi64:
-  case X86::TCRETURNri64:
-  case X86::TCRETURNmi64:
-    return BB;
   case X86::TLS_addr32:
   case X86::TLS_addr64:
   case X86::TLS_base_addr32:

Modified: llvm/trunk/lib/Target/X86/X86InstrControl.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrControl.td?rev=321747&r1=321746&r2=321747&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrControl.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrControl.td Wed Jan  3 10:20:36 2018
@@ -309,8 +309,7 @@ let isCall = 1, Uses = [RSP, SSP], Sched
 }
 
 let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1,
-    isCodeGenOnly = 1, Uses = [RSP, SSP], usesCustomInserter = 1,
-    SchedRW = [WriteJump] in {
+    isCodeGenOnly = 1, Uses = [RSP, SSP], SchedRW = [WriteJump] in {
   def TCRETURNdi64   : PseudoI<(outs),
                         (ins i64i32imm_pcrel:$dst, i32imm:$offset),
                         []>;