Fix PR1090:

Implemented some llvm_fcmp_{pred} functions at the start of the function bodies
and use them for fcmp instructions and constant expressions. These help
implement the ordered and unordered comparisons necessary for correct exectuion
of these comparisons.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33007 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 98 insertions, 42 deletions

diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 3969ca0886..c59dd60adc 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -732,7 +732,6 @@ void CWriter::printConstant(Constant *CPV) {
     case Instruction::Or:
     case Instruction::Xor:
     case Instruction::ICmp:
-    case Instruction::FCmp:
     case Instruction::Shl:
     case Instruction::LShr:
     case Instruction::AShr:
@@ -771,25 +770,6 @@ void CWriter::printConstant(Constant *CPV) {
           default: assert(0 && "Illegal ICmp predicate");
         }
         break;
-      case Instruction::FCmp:
-        switch (CE->getPredicate()) {
-          case FCmpInst::FCMP_ORD: 
-          case FCmpInst::FCMP_UEQ: 
-          case FCmpInst::FCMP_OEQ: Out << " == "; break;
-          case FCmpInst::FCMP_UNO: 
-          case FCmpInst::FCMP_UNE: 
-          case FCmpInst::FCMP_ONE: Out << " != "; break;
-          case FCmpInst::FCMP_OLT:
-          case FCmpInst::FCMP_ULT: Out << " < "; break;
-          case FCmpInst::FCMP_OLE:
-          case FCmpInst::FCMP_ULE: Out << " <= "; break;
-          case FCmpInst::FCMP_OGT: 
-          case FCmpInst::FCMP_UGT: Out << " > "; break;
-          case FCmpInst::FCMP_OGE:
-          case FCmpInst::FCMP_UGE: Out << " >= "; break;
-          default: assert(0 && "Illegal FCmp predicate");
-        }
-        break;
       default: assert(0 && "Illegal opcode here!");
       }
       printConstantWithCast(CE->getOperand(1), CE->getOpcode());
@@ -798,7 +778,42 @@ void CWriter::printConstant(Constant *CPV) {
       Out << ')';
       return;
     }
-
+    case Instruction::FCmp: {
+      Out << '('; 
+      bool NeedsClosingParens = printConstExprCast(CE); 
+      if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
+        Out << "0";
+      else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
+        Out << "1";
+      else {
+        const char* op = 0;
+        switch (CE->getPredicate()) {
+        default: assert(0 && "Illegal FCmp predicate");
+        case FCmpInst::FCMP_ORD: op = "ord"; break;
+        case FCmpInst::FCMP_UNO: op = "uno"; break;
+        case FCmpInst::FCMP_UEQ: op = "ueq"; break;
+        case FCmpInst::FCMP_UNE: op = "une"; break;
+        case FCmpInst::FCMP_ULT: op = "ult"; break;
+        case FCmpInst::FCMP_ULE: op = "ule"; break;
+        case FCmpInst::FCMP_UGT: op = "ugt"; break;
+        case FCmpInst::FCMP_UGE: op = "uge"; break;
+        case FCmpInst::FCMP_OEQ: op = "oeq"; break;
+        case FCmpInst::FCMP_ONE: op = "one"; break;
+        case FCmpInst::FCMP_OLT: op = "olt"; break;
+        case FCmpInst::FCMP_OLE: op = "ole"; break;
+        case FCmpInst::FCMP_OGT: op = "ogt"; break;
+        case FCmpInst::FCMP_OGE: op = "oge"; break;
+        }
+        Out << "llvm_fcmp_" << op << "(";
+        printConstantWithCast(CE->getOperand(0), CE->getOpcode());
+        Out << ", ";
+        printConstantWithCast(CE->getOperand(1), CE->getOpcode());
+        Out << ")";
+      }
+      if (NeedsClosingParens)
+        Out << "))";
+      Out << ')';
+    }
     default:
       cerr << "CWriter Error: Unhandled constant expression: "
            << *CE << "\n";
@@ -1563,6 +1578,37 @@ bool CWriter::doInitialization(Module &M) {
 
   if (!M.empty())
     Out << "\n\n/* Function Bodies */\n";
+
+  // Emit some helper functions for dealing with FCMP instruction's 
+  // predicates
+  Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
+  Out << "return X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
+  Out << "return X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
+  Out << "return X == Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
+  Out << "return X != Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
+  Out << "return X <  Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
+  Out << "return X >  Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
+  Out << "return X <= Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
+  Out << "return X >= Y || X != X || Y != Y; }\n";
+  Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
+  Out << "return X == Y && X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
+  Out << "return X != Y && X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
+  Out << "return X <  Y && X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
+  Out << "return X >  Y && X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
+  Out << "return X <= Y && X == X && Y == Y; }\n";
+  Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
+  Out << "return X >= Y && X == X && Y == Y; }\n";
   return false;
 }
 
@@ -2147,31 +2193,41 @@ void CWriter::visitICmpInst(ICmpInst &I) {
 }
 
 void CWriter::visitFCmpInst(FCmpInst &I) {
-  // Write the first operand
-  writeOperand(I.getOperand(0));
+  if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
+    Out << "0";
+    return;
+  }
+  if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
+    Out << "1";
+    return;
+  }
 
-  // Write the predicate
+  const char* op = 0;
   switch (I.getPredicate()) {
-  case FCmpInst::FCMP_FALSE: Out << " 0 "; break;
-  case FCmpInst::FCMP_ORD:
-  case FCmpInst::FCMP_OEQ: 
-  case FCmpInst::FCMP_UEQ:   Out << " == "; break;
-  case FCmpInst::FCMP_UNO:
-  case FCmpInst::FCMP_ONE: 
-  case FCmpInst::FCMP_UNE:   Out << " != "; break;
-  case FCmpInst::FCMP_ULE:
-  case FCmpInst::FCMP_OLE:   Out << " <= "; break;
-  case FCmpInst::FCMP_UGE:
-  case FCmpInst::FCMP_OGE:   Out << " >= "; break;
-  case FCmpInst::FCMP_ULT:
-  case FCmpInst::FCMP_OLT:   Out << " < "; break;
-  case FCmpInst::FCMP_UGT:
-  case FCmpInst::FCMP_OGT:   Out << " > "; break;
-  case FCmpInst::FCMP_TRUE:  Out << " 1 "; break;
-  default: cerr << "Invalid fcmp predicate!" << I; abort();
-  }
+  default: assert(0 && "Illegal FCmp predicate");
+  case FCmpInst::FCMP_ORD: op = "ord"; break;
+  case FCmpInst::FCMP_UNO: op = "uno"; break;
+  case FCmpInst::FCMP_UEQ: op = "ueq"; break;
+  case FCmpInst::FCMP_UNE: op = "une"; break;
+  case FCmpInst::FCMP_ULT: op = "ult"; break;
+  case FCmpInst::FCMP_ULE: op = "ule"; break;
+  case FCmpInst::FCMP_UGT: op = "ugt"; break;
+  case FCmpInst::FCMP_UGE: op = "uge"; break;
+  case FCmpInst::FCMP_OEQ: op = "oeq"; break;
+  case FCmpInst::FCMP_ONE: op = "one"; break;
+  case FCmpInst::FCMP_OLT: op = "olt"; break;
+  case FCmpInst::FCMP_OLE: op = "ole"; break;
+  case FCmpInst::FCMP_OGT: op = "ogt"; break;
+  case FCmpInst::FCMP_OGE: op = "oge"; break;
+  }
+
+  Out << "llvm_fcmp_" << op << "(";
+  // Write the first operand
+  writeOperand(I.getOperand(0));
+  Out << ", ";
   // Write the second operand
   writeOperand(I.getOperand(1));
+  Out << ")";
 }
 
 static const char * getFloatBitCastField(const Type *Ty) {