softfloat: change default nan definitions to variables
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>
diff --git a/fpu/softfloat.h b/fpu/softfloat.h
index bde2500..3bb7d8f 100644
--- a/fpu/softfloat.h
+++ b/fpu/softfloat.h
@@ -43,7 +43,7 @@
#endif
#include <inttypes.h>
-#include "config.h"
+#include "config-host.h"
/*----------------------------------------------------------------------------
| Each of the following `typedef's defines the most convenient type that holds
@@ -68,12 +68,6 @@
#define LIT64( a ) a##LL
#define INLINE static inline
-#if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
-#define SNAN_BIT_IS_ONE 1
-#else
-#define SNAN_BIT_IS_ONE 0
-#endif
-
#define STATUS_PARAM , float_status *status
#define STATUS(field) status->field
#define STATUS_VAR , status
@@ -142,6 +136,7 @@
uint64_t low, high;
#endif
} float128;
+#define make_float128(high_, low_) ((float128) { .high = high_, .low = low_ })
/*----------------------------------------------------------------------------
| Software IEC/IEEE floating-point underflow tininess-detection mode.
@@ -248,13 +243,7 @@
/*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/
-#if defined(TARGET_ARM)
-#define float16_default_nan make_float16(0x7E00)
-#elif SNAN_BIT_IS_ONE
-#define float16_default_nan make_float16(0x7DFF)
-#else
-#define float16_default_nan make_float16(0xFE00)
-#endif
+extern const float16 float16_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE single-precision conversion routines.
@@ -357,15 +346,7 @@
/*----------------------------------------------------------------------------
| The pattern for a default generated single-precision NaN.
*----------------------------------------------------------------------------*/
-#if defined(TARGET_SPARC)
-#define float32_default_nan make_float32(0x7FFFFFFF)
-#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
-#define float32_default_nan make_float32(0x7FC00000)
-#elif SNAN_BIT_IS_ONE
-#define float32_default_nan make_float32(0x7FBFFFFF)
-#else
-#define float32_default_nan make_float32(0xFFC00000)
-#endif
+extern const float32 float32_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE double-precision conversion routines.
@@ -470,15 +451,7 @@
/*----------------------------------------------------------------------------
| The pattern for a default generated double-precision NaN.
*----------------------------------------------------------------------------*/
-#if defined(TARGET_SPARC)
-#define float64_default_nan make_float64(LIT64( 0x7FFFFFFFFFFFFFFF ))
-#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
-#define float64_default_nan make_float64(LIT64( 0x7FF8000000000000 ))
-#elif SNAN_BIT_IS_ONE
-#define float64_default_nan make_float64(LIT64( 0x7FF7FFFFFFFFFFFF ))
-#else
-#define float64_default_nan make_float64(LIT64( 0xFFF8000000000000 ))
-#endif
+extern const float64 float64_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE extended double-precision conversion routines.
@@ -561,17 +534,9 @@
#define floatx80_infinity make_floatx80(0x7fff, 0x8000000000000000LL)
/*----------------------------------------------------------------------------
-| The pattern for a default generated extended double-precision NaN. The
-| `high' and `low' values hold the most- and least-significant bits,
-| respectively.
+| 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
+extern const floatx80 floatx80_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE quadruple-precision conversion routines.
@@ -648,15 +613,8 @@
}
/*----------------------------------------------------------------------------
-| The pattern for a default generated quadruple-precision NaN. The `high' and
-| `low' values hold the most- and least-significant bits, respectively.
+| The pattern for a default generated quadruple-precision NaN.
*----------------------------------------------------------------------------*/
-#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
+extern const float128 float128_default_nan;
#endif /* !SOFTFLOAT_H */