Add APInt interfaces to APFloat (allows directly

access to bits).  Use them in place of float and
double interfaces where appropriate.
First bits of x86 long double constants handling 
(untested, probably does not work).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41858 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 64 insertions, 9 deletions

diff --git a/lib/AsmParser/Lexer.l b/lib/AsmParser/Lexer.l
index 390544d..5acbbac 100644
--- a/lib/AsmParser/Lexer.l
+++ b/lib/AsmParser/Lexer.l
@@ -91,14 +91,40 @@ static uint64_t HexIntToVal(const char *Buffer) {
   return Result;
 }
 
-
-// HexToFP - Convert the ascii string in hexidecimal format to the floating
+// HexToFP - Convert the ascii string in hexadecimal format to the floating
 // point representation of it.
 //
 static double HexToFP(const char *Buffer) {
   return BitsToDouble(HexIntToVal(Buffer));   // Cast Hex constant to double
 }
 
+static void HexToIntPair(const char *Buffer, uint64_t Pair[2]) {
+  Pair[0] = 0;
+  for (int i=0; i<16; i++, Buffer++) {
+    assert(*Buffer);
+    Pair[0] *= 16;
+    char C = *Buffer;
+    if (C >= '0' && C <= '9')
+      Pair[0] += C-'0';
+    else if (C >= 'A' && C <= 'F')
+      Pair[0] += C-'A'+10;
+    else if (C >= 'a' && C <= 'f')
+      Pair[0] += C-'a'+10;
+  }
+  Pair[1] = 0;
+  for (int i=0; i<16 && *Buffer; i++, Buffer++) {
+    Pair[1] *= 16;
+    char C = *Buffer;
+    if (C >= '0' && C <= '9')
+      Pair[1] += C-'0';
+    else if (C >= 'A' && C <= 'F')
+      Pair[1] += C-'A'+10;
+    else if (C >= 'a' && C <= 'f')
+      Pair[1] += C-'a'+10;
+  }
+  if (*Buffer)
+    GenerateError("constant bigger than 128 bits detected!");
+}
 
 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
 // appropriate character.
@@ -163,15 +189,28 @@ IntegerType i[0-9]+
 PInteger   [0-9]+
 NInteger  -[0-9]+
 
-/* FPConstant - A Floating point constant.
+/* FPConstant - A Floating point constant.  Float and double only.
  */
 FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
 
 /* HexFPConstant - Floating point constant represented in IEEE format as a
  *  hexadecimal number for when exponential notation is not precise enough.
+ *  Float and double only.
  */
 HexFPConstant 0x[0-9A-Fa-f]+
 
+/* F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
+ */
+HexFP80Constant 0xK[0-9A-Fa-f]+
+
+/* F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
+ */
+HexFP128Constant 0xL[0-9A-Fa-f]+
+
+/* PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
+ */
+HexPPC128Constant 0xM[0-9A-Fa-f]+
+
 /* HexIntConstant - Hexadecimal constant generated by the CFE to avoid forcing
  * it to deal with 64 bit numbers.
  */
@@ -441,6 +480,21 @@ shufflevector   { RET_TOK(OtherOpVal, ShuffleVector, SHUFFLEVECTOR); }
 {HexFPConstant} { llvmAsmlval.FPVal = new APFloat(HexToFP(yytext)); 
                   return FPVAL; 
                 }
+{HexFP80Constant} { uint64_t Pair[2];
+                    HexToIntPair(yytext, Pair);
+                    llvmAsmlval.FPVal = new APFloat(APInt(80, 2, Pair));
+                    return FPVAL;
+                }
+{HexFP128Constant} { uint64_t Pair[2];
+                    HexToIntPair(yytext, Pair);
+                    llvmAsmlval.FPVal = new APFloat(APInt(128, 2, Pair));
+                    return FPVAL;
+                }
+{HexPPC128Constant} { uint64_t Pair[2];
+                    HexToIntPair(yytext, Pair);
+                    llvmAsmlval.FPVal = new APFloat(APInt(128, 2, Pair));
+                    return FPVAL;
+                }
 
 <<EOF>>         {
                   /* Make sure to free the internal buffers for flex when we are
diff --git a/lib/AsmParser/llvmAsmParser.y b/lib/AsmParser/llvmAsmParser.y
index 6364b29..c0374da 100644
--- a/lib/AsmParser/llvmAsmParser.y
+++ b/lib/AsmParser/llvmAsmParser.y
@@ -416,9 +416,10 @@ static Value *getExistingVal(const Type *Ty, const ValID &D) {
       GenerateError("FP constant invalid for type");
       return 0;
     }
-    // Lexer has no type info, so builds all FP constants as double.
-    // Fix this here.
-    if (Ty==Type::FloatTy)
+    // Lexer has no type info, so builds all float and double  FP constants 
+    // as double.  Fix this here.  Long double does not need this.
+    if (&D.ConstPoolFP->getSemantics() == &APFloat::IEEEdouble &&
+        Ty==Type::FloatTy)
       D.ConstPoolFP->convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven);
     return ConstantFP::get(Ty, *D.ConstPoolFP);
 
@@ -1868,9 +1869,9 @@ ConstVal: Types '[' ConstVector ']' { // Nonempty unsized arr
   | FPType FPVAL {                   // Float & Double constants
     if (!ConstantFP::isValueValidForType($1, *$2))
       GEN_ERROR("Floating point constant invalid for type");
-    // Lexer has no type info, so builds all FP constants as double.
-    // Fix this here.
-    if ($1==Type::FloatTy)
+    // Lexer has no type info, so builds all float and double FP constants 
+    // as double.  Fix this here.  Long double is done right.
+    if (&$2->getSemantics()==&APFloat::IEEEdouble && $1==Type::FloatTy)
       $2->convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven);
     $$ = ConstantFP::get($1, *$2);
     delete $2;