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softfloat: Introduce float32_to_uint64_round_to_zero

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This change adds the float32_to_uint64_round_to_zero function to the softfloat
library.  This function fills out the complement of float32 to INT round-to-zero
conversion rountines, where INT is {int32_t, uint32_t, int64_t, uint64_t}.

This contribution can be licensed under either the softfloat-2a or -2b
license.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Tested-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-03-31 16:03:55 -05:00 committed by Alexander Graf
parent 3636226ae4
commit a13d448968
2 changed files with 21 additions and 0 deletions
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20
fpu/softfloat.c
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@ -1626,6 +1626,26 @@ uint64 float32_to_uint64(float32 a STATUS_PARAM)
return roundAndPackUint64(aSign, aSig64, aSigExtra STATUS_VAR);
}
/*----------------------------------------------------------------------------
| Returns the result of converting the single-precision floating-point value
| `a' to the 64-bit unsigned integer format. The conversion is
| performed according to the IEC/IEEE Standard for Binary Floating-Point
| Arithmetic, except that the conversion is always rounded toward zero. If
| `a' is a NaN, the largest unsigned integer is returned. Otherwise, if the
| conversion overflows, the largest unsigned integer is returned. If the
| 'a' is negative, the result is rounded and zero is returned; values that do
| not round to zero will raise the inexact flag.
*----------------------------------------------------------------------------*/
uint64 float32_to_uint64_round_to_zero(float32 a STATUS_PARAM)
{
signed char current_rounding_mode = STATUS(float_rounding_mode);
set_float_rounding_mode(float_round_to_zero STATUS_VAR);
int64_t v = float32_to_uint64(a STATUS_VAR);
set_float_rounding_mode(current_rounding_mode STATUS_VAR);
return v;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the single-precision floating-point value
| `a' to the 64-bit two's complement integer format. The conversion is

1
include/fpu/softfloat.h
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@ -342,6 +342,7 @@ uint32 float32_to_uint32( float32 STATUS_PARAM );
uint32 float32_to_uint32_round_to_zero( float32 STATUS_PARAM );
int64 float32_to_int64( float32 STATUS_PARAM );
uint64 float32_to_uint64(float32 STATUS_PARAM);
uint64 float32_to_uint64_round_to_zero(float32 STATUS_PARAM);
int64 float32_to_int64_round_to_zero( float32 STATUS_PARAM );
float64 float32_to_float64( float32 STATUS_PARAM );
floatx80 float32_to_floatx80( float32 STATUS_PARAM );