Math64.c

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#include "BaseLibInternals.h"
 
UINT64
EFIAPI
InternalMathLShiftU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  return Operand << Count;
}
 
UINT64
EFIAPI
InternalMathRShiftU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  return Operand >> Count;
}
 
UINT64
EFIAPI
InternalMathARShiftU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  INTN  TestValue;
 
  //
  // Test if this compiler supports arithmetic shift
  //
  TestValue = (INTN)((INT64)(1ULL << 63) >> 63);
  if (TestValue == -1) {
    //
    // Arithmetic shift is supported
    //
    return (UINT64)((INT64)Operand >> Count);
  }
 
  //
  // Arithmetic is not supported
  //
  return (Operand >> Count) |
         ((INTN)Operand < 0 ? ~((UINTN)-1 >> Count) : 0);
}
 
UINT64
EFIAPI
InternalMathLRotU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  return (Operand << Count) | (Operand >> (64 - Count));
}
 
UINT64
EFIAPI
InternalMathRRotU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  return (Operand >> Count) | (Operand << (64 - Count));
}
 
UINT64
EFIAPI
InternalMathSwapBytes64 (
  IN      UINT64  Operand
  )
{
  UINT64  LowerBytes;
  UINT64  HigherBytes;
 
  LowerBytes  = (UINT64)SwapBytes32 ((UINT32)Operand);
  HigherBytes = (UINT64)SwapBytes32 ((UINT32)(Operand >> 32));
 
  return (LowerBytes << 32 | HigherBytes);
}
 
UINT64
EFIAPI
InternalMathMultU64x32 (
  IN      UINT64  Multiplicand,
  IN      UINT32  Multiplier
  )
{
  return Multiplicand * Multiplier;
}
 
UINT64
EFIAPI
InternalMathMultU64x64 (
  IN      UINT64  Multiplicand,
  IN      UINT64  Multiplier
  )
{
  return Multiplicand * Multiplier;
}
 
UINT64
EFIAPI
InternalMathDivU64x32 (
  IN      UINT64  Dividend,
  IN      UINT32  Divisor
  )
{
  return Dividend / Divisor;
}
 
UINT32
EFIAPI
InternalMathModU64x32 (
  IN      UINT64  Dividend,
  IN      UINT32  Divisor
  )
{
  return (UINT32)(Dividend % Divisor);
}
 
UINT64
EFIAPI
InternalMathDivRemU64x32 (
  IN      UINT64  Dividend,
  IN      UINT32  Divisor,
  OUT     UINT32  *Remainder OPTIONAL
  )
{
  if (Remainder != NULL) {
    *Remainder = (UINT32)(Dividend % Divisor);
  }
 
  return Dividend / Divisor;
}
 
UINT64
EFIAPI
InternalMathDivRemU64x64 (
  IN      UINT64  Dividend,
  IN      UINT64  Divisor,
  OUT     UINT64  *Remainder OPTIONAL
  )
{
  if (Remainder != NULL) {
    *Remainder = Dividend % Divisor;
  }
 
  return Dividend / Divisor;
}
 
INT64
EFIAPI
InternalMathDivRemS64x64 (
  IN      INT64  Dividend,
  IN      INT64  Divisor,
  OUT     INT64  *Remainder  OPTIONAL
  )
{
  if (Remainder != NULL) {
    *Remainder = Dividend % Divisor;
  }
 
  return Dividend / Divisor;
}