softfloat: Add float32_to_uint64()
This patch adds the float32_to_uint64() routine, which converts a 32-bit floating point number to an unsigned 64 bit number. This contribution can be licensed under either the softfloat-2a or -2b license. Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: removed harmless but silly int64_t casts] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
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@ -1557,6 +1557,52 @@ int64 float32_to_int64( float32 a STATUS_PARAM )
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit unsigned integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic---which means in particular that the conversion is rounded
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| according to the current rounding mode. If `a' is a NaN, the largest
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| unsigned integer is returned. Otherwise, if the conversion overflows, the
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| largest unsigned integer is returned. If the 'a' is negative, the result
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| is rounded and zero is returned; values that do not round to zero will
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| raise the inexact exception flag.
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*----------------------------------------------------------------------------*/
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uint64 float32_to_uint64(float32 a STATUS_PARAM)
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{
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flag aSign;
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int_fast16_t aExp, shiftCount;
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uint32_t aSig;
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uint64_t aSig64, aSigExtra;
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a = float32_squash_input_denormal(a STATUS_VAR);
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aSig = extractFloat32Frac(a);
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aExp = extractFloat32Exp(a);
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aSign = extractFloat32Sign(a);
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if ((aSign) && (aExp > 126)) {
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float_raise(float_flag_invalid STATUS_VAR);
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if (float32_is_any_nan(a)) {
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return LIT64(0xFFFFFFFFFFFFFFFF);
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} else {
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return 0;
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}
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}
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shiftCount = 0xBE - aExp;
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if (aExp) {
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aSig |= 0x00800000;
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}
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if (shiftCount < 0) {
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float_raise(float_flag_invalid STATUS_VAR);
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return LIT64(0xFFFFFFFFFFFFFFFF);
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}
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aSig64 = aSig;
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aSig64 <<= 40;
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shift64ExtraRightJamming(aSig64, 0, shiftCount, &aSig64, &aSigExtra);
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return roundAndPackUint64(aSign, aSig64, aSigExtra STATUS_VAR);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit two's complement integer format. The conversion is
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@ -295,6 +295,7 @@ int32 float32_to_int32_round_to_zero( float32 STATUS_PARAM );
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uint32 float32_to_uint32( float32 STATUS_PARAM );
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uint32 float32_to_uint32_round_to_zero( float32 STATUS_PARAM );
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int64 float32_to_int64( float32 STATUS_PARAM );
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uint64 float32_to_uint64(float32 STATUS_PARAM);
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int64 float32_to_int64_round_to_zero( float32 STATUS_PARAM );
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float64 float32_to_float64( float32 STATUS_PARAM );
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floatx80 float32_to_floatx80( float32 STATUS_PARAM );
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