/* Utility routines for data type conversion for GCC.
Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
- 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GCC.
it properly and handle it like (type)(narrowest_type)constant.
This way we can optimize for instance a=a*2.0 where "a" is float
but 2.0 is double constant. */
- if (TREE_CODE (exp) == REAL_CST)
+ if (TREE_CODE (exp) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (TREE_TYPE (exp)))
{
REAL_VALUE_TYPE orig;
tree type = NULL;
if (!FLOAT_TYPE_P (subt))
return exp;
+ if (DECIMAL_FLOAT_TYPE_P (expt) != DECIMAL_FLOAT_TYPE_P (subt))
+ return exp;
+
if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt))
return exp;
switch (fcode)
{
#define CASE_MATHFN(FN) case BUILT_IN_##FN: case BUILT_IN_##FN##L:
- CASE_MATHFN (ACOS)
- CASE_MATHFN (ACOSH)
- CASE_MATHFN (ASIN)
- CASE_MATHFN (ASINH)
- CASE_MATHFN (ATAN)
- CASE_MATHFN (ATANH)
- CASE_MATHFN (CBRT)
- CASE_MATHFN (COS)
CASE_MATHFN (COSH)
- CASE_MATHFN (ERF)
- CASE_MATHFN (ERFC)
CASE_MATHFN (EXP)
CASE_MATHFN (EXP10)
CASE_MATHFN (EXP2)
- CASE_MATHFN (EXPM1)
- CASE_MATHFN (FABS)
+ CASE_MATHFN (EXPM1)
CASE_MATHFN (GAMMA)
CASE_MATHFN (J0)
CASE_MATHFN (J1)
CASE_MATHFN (LGAMMA)
- CASE_MATHFN (LOG)
- CASE_MATHFN (LOG10)
- CASE_MATHFN (LOG1P)
- CASE_MATHFN (LOG2)
- CASE_MATHFN (LOGB)
CASE_MATHFN (POW10)
- CASE_MATHFN (SIN)
CASE_MATHFN (SINH)
- CASE_MATHFN (SQRT)
- CASE_MATHFN (TAN)
- CASE_MATHFN (TANH)
CASE_MATHFN (TGAMMA)
CASE_MATHFN (Y0)
CASE_MATHFN (Y1)
+ /* The above functions may set errno differently with float
+ input or output so this transformation is not safe with
+ -fmath-errno. */
+ if (flag_errno_math)
+ break;
+ CASE_MATHFN (ACOS)
+ CASE_MATHFN (ACOSH)
+ CASE_MATHFN (ASIN)
+ CASE_MATHFN (ASINH)
+ CASE_MATHFN (ATAN)
+ CASE_MATHFN (ATANH)
+ CASE_MATHFN (CBRT)
+ CASE_MATHFN (COS)
+ CASE_MATHFN (ERF)
+ CASE_MATHFN (ERFC)
+ CASE_MATHFN (FABS)
+ CASE_MATHFN (LOG)
+ CASE_MATHFN (LOG10)
+ CASE_MATHFN (LOG2)
+ CASE_MATHFN (LOG1P)
+ CASE_MATHFN (LOGB)
+ CASE_MATHFN (SIN)
+ CASE_MATHFN (SQRT)
+ CASE_MATHFN (TAN)
+ CASE_MATHFN (TANH)
#undef CASE_MATHFN
{
tree arg0 = strip_float_extensions (CALL_EXPR_ARG (expr, 0));
tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1));
if (FLOAT_TYPE_P (TREE_TYPE (arg0))
- && FLOAT_TYPE_P (TREE_TYPE (arg1)))
+ && FLOAT_TYPE_P (TREE_TYPE (arg1))
+ && DECIMAL_FLOAT_TYPE_P (itype) == DECIMAL_FLOAT_TYPE_P (type))
{
tree newtype = type;
if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == SDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == SDmode
+ || TYPE_MODE (type) == SDmode)
newtype = dfloat32_type_node;
if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == DDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == DDmode
+ || TYPE_MODE (type) == DDmode)
newtype = dfloat64_type_node;
if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == TDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == TDmode
+ || TYPE_MODE (type) == TDmode)
newtype = dfloat128_type_node;
if (newtype == dfloat32_type_node
|| newtype == dfloat64_type_node
newtype = TREE_TYPE (arg0);
if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype))
newtype = TREE_TYPE (arg1);
- if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype))
+ /* Sometimes this transformation is safe (cannot
+ change results through affecting double rounding
+ cases) and sometimes it is not. If NEWTYPE is
+ wider than TYPE, e.g. (float)((long double)double
+ + (long double)double) converted to
+ (float)(double + double), the transformation is
+ unsafe regardless of the details of the types
+ involved; double rounding can arise if the result
+ of NEWTYPE arithmetic is a NEWTYPE value half way
+ between two representable TYPE values but the
+ exact value is sufficiently different (in the
+ right direction) for this difference to be
+ visible in ITYPE arithmetic. If NEWTYPE is the
+ same as TYPE, however, the transformation may be
+ safe depending on the types involved: it is safe
+ if the ITYPE has strictly more than twice as many
+ mantissa bits as TYPE, can represent infinities
+ and NaNs if the TYPE can, and has sufficient
+ exponent range for the product or ratio of two
+ values representable in the TYPE to be within the
+ range of normal values of ITYPE. */
+ if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
+ && (flag_unsafe_math_optimizations
+ || (TYPE_PRECISION (newtype) == TYPE_PRECISION (type)
+ && real_can_shorten_arithmetic (TYPE_MODE (itype),
+ TYPE_MODE (type)))))
{
expr = build2 (TREE_CODE (expr), newtype,
fold (convert_to_real (newtype, arg0)),
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
+ case OFFSET_TYPE:
/* If this is a logical operation, which just returns 0 or 1, we can
change the type of the expression. */
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