From cd3b9a4f17cf78f208765ab2ab01f2019a9e5651 Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Wed, 9 Sep 2009 23:14:54 +0000
Subject: [PATCH] Fix pr4939: Change FPCCToARMCC to translate SETOLE to
 ARMCC::LS. See the bug report for details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81397 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp       | 17 +++++------------
 test/CodeGen/ARM/2009-09-09-fpcmp-ole.ll | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 12 deletions(-)
 create mode 100644 test/CodeGen/ARM/2009-09-09-fpcmp-ole.ll

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 827e62bb815..bae3f2c1241 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -519,12 +519,9 @@ static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
   }
 }
 
-/// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
-/// returns true if the operands should be inverted to form the proper
-/// comparison.
-static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
+/// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC.
+static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
                         ARMCC::CondCodes &CondCode2) {
-  bool Invert = false;
   CondCode2 = ARMCC::AL;
   switch (CC) {
   default: llvm_unreachable("Unknown FP condition!");
@@ -535,7 +532,7 @@ static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
   case ISD::SETGE:
   case ISD::SETOGE: CondCode = ARMCC::GE; break;
   case ISD::SETOLT: CondCode = ARMCC::MI; break;
-  case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
+  case ISD::SETOLE: CondCode = ARMCC::LS; break;
   case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
   case ISD::SETO:   CondCode = ARMCC::VC; break;
   case ISD::SETUO:  CondCode = ARMCC::VS; break;
@@ -549,7 +546,6 @@ static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
   case ISD::SETNE:
   case ISD::SETUNE: CondCode = ARMCC::NE; break;
   }
-  return Invert;
 }
 
 //===----------------------------------------------------------------------===//
@@ -1814,8 +1810,7 @@ static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG,
   }
 
   ARMCC::CondCodes CondCode, CondCode2;
-  if (FPCCToARMCC(CC, CondCode, CondCode2))
-    std::swap(TrueVal, FalseVal);
+  FPCCToARMCC(CC, CondCode, CondCode2);
 
   SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
   SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
@@ -1851,9 +1846,7 @@ static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG,
 
   assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
   ARMCC::CondCodes CondCode, CondCode2;
-  if (FPCCToARMCC(CC, CondCode, CondCode2))
-    // Swap the LHS/RHS of the comparison if needed.
-    std::swap(LHS, RHS);
+  FPCCToARMCC(CC, CondCode, CondCode2);
 
   SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
   SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
diff --git a/test/CodeGen/ARM/2009-09-09-fpcmp-ole.ll b/test/CodeGen/ARM/2009-09-09-fpcmp-ole.ll
new file mode 100644
index 00000000000..98cab9a9149
--- /dev/null
+++ b/test/CodeGen/ARM/2009-09-09-fpcmp-ole.ll
@@ -0,0 +1,18 @@
+; RUN: llc -O1 -march=arm -mattr=+vfp2 < %s | FileCheck %s
+; pr4939
+
+define void @test(double* %x, double* %y) nounwind {
+  %1 = load double* %x, align 4
+  %2 = load double* %y, align 4
+  %3 = fsub double -0.000000e+00, %1
+  %4 = fcmp ugt double %2, %3
+  br i1 %4, label %bb1, label %bb2
+
+bb1:
+;CHECK: fstdhi
+  store double %1, double* %y, align 4
+  br label %bb2
+
+bb2:
+  ret void
+}