diff options
| author | Tom Musta <tommusta@gmail.com> | 2014-03-31 16:03:55 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-04-08 11:20:00 +0200 |
| commit | a13d44896854329581ba48607d66c6b2aec157f7 (patch) | |
| tree | 555b40a36f9607973793a332e694a16c833d10c9 /fpu | |
| parent | 3636226ae45a9b04af5202a18f445680c88473e7 (diff) | |
softfloat: Introduce float32_to_uint64_round_to_zero
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>
Diffstat (limited to 'fpu')
| -rw-r--r-- | fpu/softfloat.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 5f02c16d8d..e00a6fbca6 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1628,6 +1628,26 @@ uint64 float32_to_uint64(float32 a STATUS_PARAM) /*---------------------------------------------------------------------------- | 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 | performed according to the IEC/IEEE Standard for Binary Floating-Point | Arithmetic, except that the conversion is always rounded toward zero. If |