From ff97eb0cf4394090570feaa327d1237ba4b935e2 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 30 Jun 2011 19:38:01 +0000
Subject: [PATCH] Pseudo-ize the Thumb tTPsoft instruction.

It's just a call to a special helper function. Get rid of the T2 variant
entirely, as it's identical to the Thumb1 version.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134178 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMExpandPseudoInsts.cpp |  3 ++-
 lib/Target/ARM/ARMInstrThumb.td         | 12 +++++-------
 lib/Target/ARM/ARMInstrThumb2.td        | 16 ----------------
 utils/TableGen/ARMDecoderEmitter.cpp    |  4 ----
 4 files changed, 7 insertions(+), 28 deletions(-)

diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 71b33d37369..53a5f7df624 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -856,10 +856,11 @@ bool ARMExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
       MI.eraseFromParent();
       return true;
     }
+    case ARM::tTPsoft:
     case ARM::TPsoft: {
       MachineInstrBuilder MIB =
         BuildMI(MBB, MBBI, MI.getDebugLoc(),
-                TII->get(ARM::BL))
+                TII->get(Opcode == ARM::tTPsoft ? ARM::tBL : ARM::BL))
         .addExternalSymbol("__aeabi_read_tp", 0);
 
       MIB->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index bb261ec1711..10476335bd2 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -1392,13 +1392,11 @@ def tCDP : T1Cop<(outs), (ins p_imm:$cop, i32imm:$opc1,
 //
 
 // __aeabi_read_tp preserves the registers r1-r3.
-let isCall = 1, Defs = [R0, LR], Uses = [SP] in
-def tTPsoft : TIx2<0b11110, 0b11, 1, (outs), (ins), IIC_Br,
-                   "bl\t__aeabi_read_tp",
-                   [(set R0, ARMthread_pointer)]> {
-  // Encoding is 0xf7fffffe.
-  let Inst = 0xf7fffffe;
-}
+// This is a pseudo inst so that we can get the encoding right,
+// complete with fixup for the aeabi_read_tp function.
+let isCall = 1, Defs = [R0, R12, LR, CPSR], Uses = [SP] in
+def tTPsoft : tPseudoInst<(outs), (ins), Size4Bytes, IIC_Br,
+                          [(set R0, ARMthread_pointer)]>;
 
 //===----------------------------------------------------------------------===//
 // SJLJ Exception handling intrinsics
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index ffa2d89aecc..d49b2822e30 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -2909,22 +2909,6 @@ def t2CLREX : T2XI<(outs), (ins), NoItinerary, "clrex",
 }
 
 //===----------------------------------------------------------------------===//
-// TLS Instructions
-//
-
-// __aeabi_read_tp preserves the registers r1-r3.
-let isCall = 1,
-  Defs = [R0, R12, LR, CPSR], Uses = [SP] in {
-  def t2TPsoft : T2XI<(outs), (ins), IIC_Br,
-                     "bl\t__aeabi_read_tp",
-                     [(set R0, ARMthread_pointer)]> {
-    let Inst{31-27} = 0b11110;
-    let Inst{15-14} = 0b11;
-    let Inst{12} = 1;
-  }
-}
-
-//===----------------------------------------------------------------------===//
 // SJLJ Exception handling intrinsics
 //   eh_sjlj_setjmp() is an instruction sequence to store the return
 //   address and save #0 in R0 for the non-longjmp case.
diff --git a/utils/TableGen/ARMDecoderEmitter.cpp b/utils/TableGen/ARMDecoderEmitter.cpp
index b3aac9898b2..a7cbbcd84b7 100644
--- a/utils/TableGen/ARMDecoderEmitter.cpp
+++ b/utils/TableGen/ARMDecoderEmitter.cpp
@@ -1624,10 +1624,6 @@ ARMDEBackend::populateInstruction(const CodeGenInstruction &CGI,
     if (Name == "tBX_RET" || Name == "tBX_RET_vararg")
       return false;
 
-    // Ignore the TPsoft (TLS) instructions, which conflict with tBLr9.
-    if (Name == "tTPsoft" || Name == "t2TPsoft")
-      return false;
-
     // Ignore tADR, prefer tADDrPCi.
     if (Name == "tADR")
       return false;
-- 
2.11.0