diff mbox

[v3,4/7] softfloat: define floatx80_round()

Message ID 20170627191221.31650-5-laurent@vivier.eu
State New
Headers show

Commit Message

Laurent Vivier June 27, 2017, 7:12 p.m. UTC 
Add a function to round a floatx80 to the defined precision
(floatx80_rounding_precision)

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 fpu/softfloat.c         | 15 +++++++++++++++
 include/fpu/softfloat.h |  1 +
 2 files changed, 16 insertions(+)

Comments

Aurelien Jarno June 27, 2017, 8:15 p.m. UTC | #1 
On 2017-06-27 21:12, Laurent Vivier wrote:
> Add a function to round a floatx80 to the defined precision
> (floatx80_rounding_precision)
> 
> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
> Reviewed-by: Richard Henderson <rth@twiddle.net>
> ---
>  fpu/softfloat.c         | 15 +++++++++++++++
>  include/fpu/softfloat.h |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
> index 7af14e2..e9bf359 100644
> --- a/fpu/softfloat.c
> +++ b/fpu/softfloat.c
> @@ -5086,6 +5086,21 @@ float128 floatx80_to_float128(floatx80 a, float_status *status)
>  }
>  
>  /*----------------------------------------------------------------------------
> +| Rounds the extended double-precision floating-point value `a'

Maybe it is worth mentioning the precision to which the value is rounded
(floatx80_rounding_precision) ?

Otherwise looks all fine to me.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
diff mbox

Patch

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 7af14e2..e9bf359 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -5086,6 +5086,21 @@  float128 floatx80_to_float128(floatx80 a, float_status *status)
 }
 
 /*----------------------------------------------------------------------------
+| Rounds the extended double-precision floating-point value `a'
+| and returns the result as an extended double-precision floating-point
+| value.  The operation is performed according to the IEC/IEEE Standard for
+| Binary Floating-Point Arithmetic.
+*----------------------------------------------------------------------------*/
+
+floatx80 floatx80_round(floatx80 a, float_status *status)
+{
+    return roundAndPackFloatx80(status->floatx80_rounding_precision,
+                                extractFloatx80Sign(a),
+                                extractFloatx80Exp(a),
+                                extractFloatx80Frac(a), 0, status);
+}
+
+/*----------------------------------------------------------------------------
 | Rounds the extended double-precision floating-point value `a' to an integer,
 | and returns the result as an extended quadruple-precision floating-point
 | value.  The operation is performed according to the IEC/IEEE Standard for
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index f1288ef..d9689ec 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -621,6 +621,7 @@  float128 floatx80_to_float128(floatx80, float_status *status);
 /*----------------------------------------------------------------------------
 | Software IEC/IEEE extended double-precision operations.
 *----------------------------------------------------------------------------*/
+floatx80 floatx80_round(floatx80 a, float_status *status);
 floatx80 floatx80_round_to_int(floatx80, float_status *status);
 floatx80 floatx80_add(floatx80, floatx80, float_status *status);
 floatx80 floatx80_sub(floatx80, floatx80, float_status *status);