Next round of APFloat changes.

Use APFloat in UpgradeParser and AsmParser.
Change all references to ConstantFP to use the
APFloat interface rather than double.  Remove
the ConstantFP double interfaces.
Use APFloat functions for constant folding arithmetic
and comparisons.
(There are still way too many places APFloat is
just a wrapper around host float/double, but we're
getting there.)

llvm-svn: 41747

1 files changed, 41 insertions, 14 deletions

diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index 70ce34969c9..6c828fa0042 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -407,8 +407,14 @@ static Constant *ConstantFoldFP(double (*NativeFP)(double), double V,
                                 const Type *Ty) {
   errno = 0;
   V = NativeFP(V);
-  if (errno == 0)
-    return ConstantFP::get(Ty, V);
+  if (errno == 0) {
+    if (Ty==Type::FloatTy)
+      return ConstantFP::get(Ty, APFloat((float)V));
+    else if (Ty==Type::DoubleTy)
+      return ConstantFP::get(Ty, APFloat(V));
+    else
+      assert(0);
+  }
   errno = 0;
   return 0;
 }
@@ -418,14 +424,21 @@ static Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double),
                                       const Type *Ty) {
   errno = 0;
   V = NativeFP(V, W);
-  if (errno == 0)
-    return ConstantFP::get(Ty, V);
+  if (errno == 0) {
+    if (Ty==Type::FloatTy)
+      return ConstantFP::get(Ty, APFloat((float)V));
+    else if (Ty==Type::DoubleTy)
+      return ConstantFP::get(Ty, APFloat(V));
+    else
+      assert(0);
+  }
   errno = 0;
   return 0;
 }
 
 /// ConstantFoldCall - Attempt to constant fold a call to the specified function
 /// with the specified arguments, returning null if unsuccessful.
+
 Constant *
 llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
   const ValueName *NameVal = F->getValueName();
@@ -436,7 +449,14 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
   const Type *Ty = F->getReturnType();
   if (NumOperands == 1) {
     if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) {
-      double V = Op->getValue();
+      if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+        return 0;
+      /// Currently APFloat versions of these functions do not exist, so we use
+      /// the host native double versions.  Float versions are not called
+      /// directly but for all these it is true (float)(f((double)arg)) ==
+      /// f(arg).  Long double not supported yet.
+      double V = Ty==Type::FloatTy ? (double)Op->getValueAPF().convertToFloat():
+                                     Op->getValueAPF().convertToDouble();
       switch (Str[0]) {
       case 'a':
         if (Len == 4 && !strcmp(Str, "acos"))
@@ -460,7 +480,7 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
         break;
       case 'f':
         if (Len == 4 && !strcmp(Str, "fabs"))
-          return ConstantFP::get(Ty, fabs(V));
+          return ConstantFoldFP(fabs, V, Ty);
         else if (Len == 5 && !strcmp(Str, "floor"))
           return ConstantFoldFP(floor, V, Ty);
         break;
@@ -472,9 +492,10 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
         else if (!strcmp(Str, "llvm.sqrt.f32") ||
                  !strcmp(Str, "llvm.sqrt.f64")) {
           if (V >= -0.0)
-            return ConstantFP::get(Ty, sqrt(V));
+            return ConstantFoldFP(sqrt, V, Ty);
           else // Undefined
-            return ConstantFP::get(Ty, 0.0);
+            return ConstantFP::get(Ty, Ty==Type::FloatTy ? APFloat(0.0f) :
+                                       APFloat(0.0));
         }
         break;
       case 's':
@@ -512,9 +533,15 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
     }
   } else if (NumOperands == 2) {
     if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
-      double Op1V = Op1->getValue();
+      double Op1V = Ty==Type::FloatTy ? 
+                      (double)Op1->getValueAPF().convertToFloat():
+                      Op1->getValueAPF().convertToDouble();
       if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
-        double Op2V = Op2->getValue();
+        if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+          return 0;
+        double Op2V = Ty==Type::FloatTy ? 
+                      (double)Op2->getValueAPF().convertToFloat():
+                      Op2->getValueAPF().convertToDouble();
 
         if (Len == 3 && !strcmp(Str, "pow")) {
           return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
@@ -525,11 +552,11 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
         }
       } else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) {
         if (!strcmp(Str, "llvm.powi.f32")) {
-          return ConstantFP::get(Ty, std::pow((float)Op1V,
-                                              (int)Op2C->getZExtValue()));
+          return ConstantFP::get(Ty, APFloat((float)std::pow((float)Op1V,
+                                              (int)Op2C->getZExtValue())));
         } else if (!strcmp(Str, "llvm.powi.f64")) {
-          return ConstantFP::get(Ty, std::pow((double)Op1V,
-                                              (int)Op2C->getZExtValue()));
+          return ConstantFP::get(Ty, APFloat((double)std::pow((double)Op1V,
+                                              (int)Op2C->getZExtValue())));
         }
       }
     }