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softfloat: use floatx80_infinity in softfloat

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Since f3218a8 ("softfloat: add floatx80 constants")
floatx80_infinity is defined but never used.

This patch updates floatx80 functions to use
this definition.

This allows to define a different default Infinity
value on m68k: the m68k FPU defines infinity with
all bits set to zero in the mantissa.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180224201802.911-4-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier
2018-03-04 17:27:35 +01:00
parent 591596b77a
commit 0f605c889c
3 changed files with 50 additions and 16 deletions
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include/fpu/softfloat.h
+11 -2
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@@ -572,6 +572,11 @@ float32 floatx80_to_float32(floatx80, float_status *status);
float64 floatx80_to_float64(floatx80, float_status *status);
float128 floatx80_to_float128(floatx80, float_status *status);
/*----------------------------------------------------------------------------
| The pattern for an extended double-precision inf.
*----------------------------------------------------------------------------*/
extern const floatx80 floatx80_infinity;
/*----------------------------------------------------------------------------
| Software IEC/IEEE extended double-precision operations.
*----------------------------------------------------------------------------*/
@@ -612,7 +617,12 @@ static inline floatx80 floatx80_chs(floatx80 a)
static inline int floatx80_is_infinity(floatx80 a)
{
return (a.high & 0x7fff) == 0x7fff && a.low == 0x8000000000000000LL;
#if defined(TARGET_M68K)
return (a.high & 0x7fff) == floatx80_infinity.high && !(a.low << 1);
#else
return (a.high & 0x7fff) == floatx80_infinity.high &&
a.low == floatx80_infinity.low;
#endif
}
static inline int floatx80_is_neg(floatx80 a)
@@ -655,7 +665,6 @@ static inline bool floatx80_invalid_encoding(floatx80 a)
#define floatx80_ln2 make_floatx80(0x3ffe, 0xb17217f7d1cf79acLL)
#define floatx80_pi make_floatx80(0x4000, 0xc90fdaa22168c235LL)
#define floatx80_half make_floatx80(0x3ffe, 0x8000000000000000LL)
#define floatx80_infinity make_floatx80(0x7fff, 0x8000000000000000LL)
/*----------------------------------------------------------------------------
| Returns the fraction bits of the extended double-precision floating-point