From 94a50da93cb9fdc45f3c3ab06f68380b31dd0c1c Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 29 Aug 2008 22:13:21 +0000
Subject: [PATCH] Backing out 55521. Not safe.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55548 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp | 22 ++++------------------
 lib/Target/X86/X86InstrInfo.cpp    | 27 +--------------------------
 lib/Target/X86/X86InstrInfo.h      |  5 -----
 3 files changed, 5 insertions(+), 49 deletions(-)

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 26c9cd76a1c..8f7b668ca0b 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1909,6 +1909,7 @@ SDValue X86TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) {
 }
 
 
+
 /// translateX86CC - do a one to one translation of a ISD::CondCode to the X86
 /// specific condition code. It returns a false if it cannot do a direct
 /// translation. X86CC is the translated CondCode.  LHS/RHS are modified as
@@ -1935,10 +1936,7 @@ static bool translateX86CC(ISD::CondCode SetCCOpcode, bool isFP,
         return true;
       }
     }
-  }
 
-  bool Flip = false;
-  if (!isFP) {
     switch (SetCCOpcode) {
     default: break;
     case ISD::SETEQ:  X86CC = X86::COND_E;  break;
@@ -1959,6 +1957,7 @@ static bool translateX86CC(ISD::CondCode SetCCOpcode, bool isFP,
     //  0 | 0 | 1 | X < Y
     //  1 | 0 | 0 | X == Y
     //  1 | 1 | 1 | unordered
+    bool Flip = false;
     switch (SetCCOpcode) {
     default: break;
     case ISD::SETUEQ:
@@ -1980,24 +1979,11 @@ static bool translateX86CC(ISD::CondCode SetCCOpcode, bool isFP,
     case ISD::SETUO: X86CC = X86::COND_P;  break;
     case ISD::SETO:  X86CC = X86::COND_NP; break;
     }
-  }
-
-  if (X86CC == X86::COND_INVALID)
-    return false;
-
-  if (Flip)
-    std::swap(LHS, RHS);
-
-  if (isFP) {
-    bool LHSCanFold = ISD::isNON_EXTLoad(LHS.getNode()) && LHS.hasOneUse();
-    bool RHSCanFold = ISD::isNON_EXTLoad(RHS.getNode()) && RHS.hasOneUse();
-    if (LHSCanFold && !RHSCanFold) {
-      X86CC = X86::GetSwappedBranchCondition(static_cast<X86::CondCode>(X86CC));
+    if (Flip)
       std::swap(LHS, RHS);
-    }
   }
 
-  return true;
+  return X86CC != X86::COND_INVALID;
 }
 
 /// hasFPCMov - is there a floating point cmov for the specific X86 condition
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 6066e5cf66f..bcbebcd45df 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -1433,30 +1433,6 @@ X86::CondCode X86::GetOppositeBranchCondition(X86::CondCode CC) {
   }
 }
 
-/// GetSwappedBranchCondition - Return the branch condition that would be
-/// the result of exchanging the two operands of a comparison without
-/// changing the result produced.
-/// e.g. COND_E to COND_E, COND_G -> COND_L
-X86::CondCode X86::GetSwappedBranchCondition(X86::CondCode CC) {
-  switch (CC) {
-  default: assert(0 && "Illegal condition code!");
-  case X86::COND_E:  return X86::COND_E;
-  case X86::COND_NE: return X86::COND_NE;
-  case X86::COND_L:  return X86::COND_G;
-  case X86::COND_LE: return X86::COND_GE;
-  case X86::COND_G:  return X86::COND_L;
-  case X86::COND_GE: return X86::COND_LE;
-  case X86::COND_B:  return X86::COND_A;
-  case X86::COND_BE: return X86::COND_AE;
-  case X86::COND_A:  return X86::COND_B;
-  case X86::COND_AE: return X86::COND_BE;
-  case X86::COND_P:  return X86::COND_P;
-  case X86::COND_NP: return X86::COND_NP;
-  case X86::COND_O:  return X86::COND_O;
-  case X86::COND_NO: return X86::COND_NO;
-  }
-}
-
 bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
   const TargetInstrDesc &TID = MI->getDesc();
   if (!TID.isTerminator()) return false;
@@ -2397,8 +2373,7 @@ bool X86InstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
 bool X86InstrInfo::
 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
   assert(Cond.size() == 1 && "Invalid X86 branch condition!");
-  X86::CondCode CC = static_cast<X86::CondCode>(Cond[0].getImm());
-  Cond[0].setImm(GetOppositeBranchCondition(CC));
+  Cond[0].setImm(GetOppositeBranchCondition((X86::CondCode)Cond[0].getImm()));
   return false;
 }
 
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index 6d0eebe2b15..2b089f31189 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -54,11 +54,6 @@ namespace X86 {
   /// e.g. turning COND_E to COND_NE.
   CondCode GetOppositeBranchCondition(X86::CondCode CC);
 
-  /// GetSwappedBranchCondition - Return the branch condition that would be
-  /// the result of exchanging the two operands of a comparison without
-  /// changing the result produced.
-  /// e.g. COND_E to COND_E, COND_G -> COND_L
-  CondCode GetSwappedBranchCondition(X86::CondCode CC);
 }
   
 /// X86II - This namespace holds all of the target specific flags that