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softfloat: change default nan definitions to variables

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Most definitions in softfloat.h are really target-independent, but the
file is not because it includes definitions of the default NaN values.
Change those to variables to allow including softfloat.h from files that
are not compiled per-target.  By making them const, the compiler is
allowed to optimize them into softfloat functions that use them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2011-07-28 12:10:29 +02:00 • committed by Anthony Liguori
parent 332ae28dad
commit 789ec7ce20
2 changed files with 81 additions and 51 deletions
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72
fpu/softfloat-specialize.h
View file

@ -35,6 +35,78 @@ these four paragraphs for those parts of this code that are retained.
=============================================================================*/
#if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
#define SNAN_BIT_IS_ONE 1
#else
#define SNAN_BIT_IS_ONE 0
#endif
/*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/
#if defined(TARGET_ARM)
const float16 float16_default_nan = const_float16(0x7E00);
#elif SNAN_BIT_IS_ONE
const float16 float16_default_nan = const_float16(0x7DFF);
#else
const float16 float16_default_nan = const_float16(0xFE00);
#endif
/*----------------------------------------------------------------------------
| The pattern for a default generated single-precision NaN.
*----------------------------------------------------------------------------*/
#if defined(TARGET_SPARC)
const float32 float32_default_nan = const_float32(0x7FFFFFFF);
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
const float32 float32_default_nan = const_float32(0x7FC00000);
#elif SNAN_BIT_IS_ONE
const float32 float32_default_nan = const_float32(0x7FBFFFFF);
#else
const float32 float32_default_nan = const_float32(0xFFC00000);
#endif
/*----------------------------------------------------------------------------
| The pattern for a default generated double-precision NaN.
*----------------------------------------------------------------------------*/
#if defined(TARGET_SPARC)
const float64 float64_default_nan = const_float64(LIT64( 0x7FFFFFFFFFFFFFFF ));
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
const float64 float64_default_nan = const_float64(LIT64( 0x7FF8000000000000 ));
#elif SNAN_BIT_IS_ONE
const float64 float64_default_nan = const_float64(LIT64( 0x7FF7FFFFFFFFFFFF ));
#else
const float64 float64_default_nan = const_float64(LIT64( 0xFFF8000000000000 ));
#endif
/*----------------------------------------------------------------------------
| The pattern for a default generated extended double-precision NaN.
*----------------------------------------------------------------------------*/
#if SNAN_BIT_IS_ONE
#define floatx80_default_nan_high 0x7FFF
#define floatx80_default_nan_low LIT64( 0xBFFFFFFFFFFFFFFF )
#else
#define floatx80_default_nan_high 0xFFFF
#define floatx80_default_nan_low LIT64( 0xC000000000000000 )
#endif
const floatx80 floatx80_default_nan = make_floatx80(floatx80_default_nan_high,
floatx80_default_nan_low);
/*----------------------------------------------------------------------------
| The pattern for a default generated quadruple-precision NaN. The `high' and
| `low' values hold the most- and least-significant bits, respectively.
*----------------------------------------------------------------------------*/
#if SNAN_BIT_IS_ONE
#define float128_default_nan_high LIT64( 0x7FFF7FFFFFFFFFFF )
#define float128_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF )
#else
#define float128_default_nan_high LIT64( 0xFFFF800000000000 )
#define float128_default_nan_low LIT64( 0x0000000000000000 )
#endif
const float128 float128_default_nan = make_float128(float128_default_nan_high,
float128_default_nan_low);
/*----------------------------------------------------------------------------
| Raises the exceptions specified by `flags'. Floating-point traps can be
| defined here if desired. It is currently not possible for such a trap